10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

     ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2019

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 1-7933

Aon plc

(Exact Name of Registrant as Specified in Its Charter)

ENGLAND AND WALES	98-1030901
(State or Other Jurisdiction of	(I.R.S. Employer
Incorporation or Organization)	Identification No.)

122 LEADENHALL STREET	,	LONDON	,	ENGLAND	EC3V 4AN
(Address of Principal Executive Offices)					(Zip Code)

+44 20 7623 5500

(Registrant’s Telephone Number,

Including Area Code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes  ☒  No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes  ☒  No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☐ No ☒

Number of Class A Ordinary Shares of Aon plc, $0.01 nominal value, outstanding as of October 24, 2019:  234,137,408

Table of Contents

PART I
	Item 1. Financial Statements
	Aon plc Condensed Consolidated Statements of Income
	Aon plc Condensed Consolidated Statements of Comprehensive Income
	Aon plc Condensed Consolidated Statements of Financial Position
	Aon plc Condensed Consolidated Statements of Shareholders’ Equity
	Aon plc Condensed Consolidated Statements of Cash Flows
	Notes to Condensed Consolidated Financial Statements
	Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations
	Item 3. Quantitative and Qualitative Disclosures about Market Risk
	Item 4. Controls and Procedures
PART II
	Item 1. Legal Proceedings
	Item 1A. Risk Factors
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
	Item 3. Defaults Upon Senior Securities
	Item 4. Mine Safety Disclosures
	Item 5. Other Information
	Item 6. Exhibits
	Signature
	Exhibit Index

Part I Financial Information

Item 1. Financial Statements

Aon plc

Condensed Consolidated Statements of Income

(Unaudited)

	Three Months Ended						Nine Months Ended
(millions, except per share data)	September 30, 2019			September 30, 2018			September 30, 2019			September 30, 2018
Revenue
Total revenue	$	2,379		$	2,349		$	8,128		$	8,000
Expenses
Compensation and benefits	1,368			1,392			4,453			4,502
Information technology	120			125			363			363
Premises	76			94			248			283
Depreciation of fixed assets	44			40			124			126
Amortization and impairment of intangible assets	101			100			295			492
Other general expense	310			336			1,000			1,189
Total operating expenses	2,019			2,087			6,483			6,955
Operating income	360			262			1,645			1,045
Interest income	1			—			4			5
Interest expense	(78		)	(69		)	(227		)	(208		)
Other income (expense)	2			1			8			(17		)
Income from continuing operations before income taxes	285			194			1,430			825
Income tax expense	56			39			238			9
Net income from continuing operations	229			155			1,192			816
Net income (loss) from discontinued operations	(1		)	(2		)	(1		)	5
Net income	228			153			1,191			821
Less: Net income attributable to noncontrolling interests	6			6			33			32
Net income attributable to Aon shareholders	$	222		$	147		$	1,158		$	789
Basic net income per share attributable to Aon shareholders
Continuing operations	$	0.94		$	0.61		$	4.83		$	3.18
Discontinued operations	—			(0.01		)	—			0.02
Net income	$	0.94		$	0.60		$	4.83		$	3.20
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	0.93		$	0.61		$	4.79		$	3.17
Discontinued operations	—			(0.01		)	—			0.02
Net income	$	0.93		$	0.60		$	4.79		$	3.19
Weighted average ordinary shares outstanding - basic	236.9			244.0			239.9			246.2
Weighted average ordinary shares outstanding - diluted	239.1			245.6			241.9			247.7

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

2

Aon plc

Condensed Consolidated Statements of Comprehensive Income

(Unaudited) 

	Three Months Ended						Nine Months Ended
(millions)	September 30, 2019			September 30, 2018			September 30, 2019			September 30, 2018
Net income	$	228		$	153		$	1,191		$	821
Less: Net income attributable to noncontrolling interests	6			6			33			32
Net income attributable to Aon shareholders	222			147			1,158			789
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	(2		)	1			(3		)	14
Foreign currency translation adjustments	(212		)	(50		)	(182		)	(263		)
Postretirement benefit obligation	17			(62		)	62			108
Total other comprehensive loss	(197		)	(111		)	(123		)	(141		)
Less: Other comprehensive loss attributable to noncontrolling interests	(4		)	(3		)	(2		)	(6		)
Total other comprehensive loss attributable to Aon shareholders	(193		)	(108		)	(121		)	(135		)
Comprehensive income attributable to Aon shareholders	$	29		$	39		$	1,037		$	654

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

3

Aon plc

Condensed Consolidated Statements of Financial Position

	(Unaudited)
(millions, except nominal value)	September 30, 2019			December 31, 2018
Assets
Current assets
Cash and cash equivalents	$	602		$	656
Short-term investments	177			172
Receivables, net	2,866			2,760
Fiduciary assets	11,041			10,166
Other current assets	631			618
Total current assets	15,317			14,372
Goodwill	8,071			8,171
Intangible assets, net	874			1,149
Fixed assets, net	606			588
Operating lease right-of-use assets	913			—
Deferred tax assets	611			561
Prepaid pension	1,213			1,133
Other non-current assets	562			448
Total assets	$	28,167		$	26,422
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	1,499		$	1,943
Short-term debt and current portion of long-term debt	1,148			251
Fiduciary liabilities	11,041			10,166
Other current liabilities	1,163			936
Total current liabilities	14,851			13,296
Long-term debt	6,120			5,993
Non-current operating lease liabilities	922			—
Deferred tax liabilities	209			181
Pension, other postretirement, and postemployment liabilities	1,551			1,636
Other non-current liabilities	953			1,097
Total liabilities	24,606			22,203
Equity
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2019 - 234.1; 2018 - 240.1)	2			2
Additional paid-in capital	6,084			5,965
Retained earnings	1,436			2,093
Accumulated other comprehensive loss	(4,030		)	(3,909		)
Total Aon shareholders' equity	3,492			4,151
Noncontrolling interests	69			68
Total equity	3,561			4,219
Total liabilities and equity	$	28,167		$	26,422

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

4

Aon plc

Condensed Consolidated Statements of Shareholders’ Equity

(Unaudited) 

(millions)	Shares		Ordinary Shares and Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Loss, Net of Tax			Non- controlling Interests			Total
Balance at January 1, 2019	240.1		$	5,967		$	2,093		$	(3,909	)	$	68		$	4,219
Net income	—		—			659			—			17			676
Shares issued - employee stock compensation plans	1.4		(96		)	—			—			—			(96		)
Shares purchased	(0.6	)	—			(101		)	—			—			(101		)
Share-based compensation expense	—		89			—			—			—			89
Dividends to shareholders ($0.40 per share)	—		—			(96		)	—			—			(96		)
Net change in fair value of financial instruments	—		—			—			7			—			7
Net foreign currency translation adjustments	—		—			—			131			2			133
Net postretirement benefit obligation	—		—			—			31			—			31
Balance at March 31, 2019	240.9		5,960			2,555			(3,740		)	87			4,862
Net income	—		—			277			—			10			287
Shares issued - employee stock compensation plans	0.6		(47		)	—			—			—			(47		)
Shares purchased	(5.8	)	—			(1,056		)	—			—			(1,056		)
Share-based compensation expense	—		91			—			—			—			91
Dividends to shareholders ($0.44 per share)	—		—			(107		)	—			—			(107		)
Net change in fair value of financial instruments	—		—			—			(8		)	—			(8		)
Net foreign currency translation adjustments	—		—			—			(103		)	—			(103		)
Net postretirement benefit obligation	—		—			—			14			—			14
Dividends paid to noncontrolling interests on subsidiary common stock	—		—			—			—			(20		)	(20		)
Balance at June 30, 2019	235.7		6,004			1,669			(3,837		)	77			3,913
Net income	—		—			222			—			6			228
Shares issued - employee stock compensation plans	0.2		10			(1		)	—			—			9
Shares purchased	(1.8	)	—			(350		)	—			—			(350		)
Share-based compensation expense	—		72			—			—			—			72
Dividends to shareholders ($0.44 per share)	—		—			(104		)	—			—			(104		)
Net change in fair value of financial instruments	—		—			—			(2		)	—			(2		)
Net foreign currency translation adjustments	—		—			—			(208		)	(4		)	(212		)
Net postretirement benefit obligation	—		—			—			17			—			17
Dividends paid to noncontrolling interests on subsidiary common stock	—		—			—			—			(10		)	(10		)
Balance at September 30, 2019	234.1		$	6,086		$	1,436		$	(4,030	)	$	69		$	3,561

5

Aon plc

Condensed Consolidated Statements of Shareholders’ Equity

(Unaudited)

 

(millions)	Shares		Ordinary Shares and Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Loss, Net of Tax			Non- controlling Interests			Total
Balance at January 1, 2018	247.6		$	5,777		$	2,795		$	(3,497	)	$	65		$	5,140
Net income	—		—			594			—			16			610
Shares issued - employee stock compensation plans	1.5		(109		)	—			—			—			(109		)
Shares purchased	(3.9	)	—			(553		)	—			—			(553		)
Share-based compensation expense	—		77			—			—			—			77
Dividends to shareholders ($0.36 per share)	—		—			(89		)	—			—			(89		)
Net change in fair value of financial instruments	—		—			—			14			—			14
Net foreign currency translation adjustments	—		—			—			244			3			247
Net postretirement benefit obligation	—		—			—			48			—			48
Balance at March 31, 2018	245.2		5,745			2,747			(3,191		)	84			5,385
Net income	—		—			48			—			10			58
Shares issued - employee stock compensation plans	0.6		(41		)	—			—			—			(41		)
Shares purchased	(2.8	)	—			(402		)	—			—			(402		)
Share-based compensation expense	—		70			—			—			—			70
Dividends to shareholders ($0.40 per share)	—		—			(98		)	—			—			(98		)
Net change in fair value of financial instruments	—		—			—			(1		)	—			(1		)
Net foreign currency translation adjustments	—		—			—			(454		)	(6		)	(460		)
Net postretirement benefit obligation	—		—			—			122			—			122
Purchases of shares from noncontrolling interests	—		—			—			—			(1		)	(1		)
Dividends paid to noncontrolling interests on subsidiary common stock	—		—			—			—			(14		)	(14		)
Balance at June 30, 2018	243.0		5,774			2,295			(3,524		)	73			4,618
Net income	—		—			147			—			6			153
Shares issued - employee stock compensation plans	0.3		11			(1		)	—			—			10
Shares purchased	(2.1	)	—			(301		)	—			—			(301		)
Share-based compensation expense	—		67			—			—			—			67
Dividends to shareholders ($0.40 per share)	—		—			(98		)	—			—			(98		)
Net change in fair value of financial instruments	—		—			—			1			—			1
Net foreign currency translation adjustments	—		—			—			(47		)	(3		)	(50		)
Net postretirement benefit obligation	—		—			—			(62		)	—			(62		)
Dividends paid to noncontrolling interests on subsidiary common stock	—		—			—			—			(10		)	(10		)
Balance at September 30, 2018	241.2		$	5,852		$	2,042		$	(3,632	)	$	66		$	4,328

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

6

Aon plc

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
(millions)	September 30, 2019			September 30, 2018
Cash flows from operating activities
Net income	$	1,191		$	821
Less: Net income (loss) from discontinued operations	(1		)	5
Adjustments to reconcile net income to cash provided by operating activities:
(Gain) loss from sales of businesses, net	(8		)	4
Depreciation of fixed assets	124			126
Amortization and impairment of intangible assets	295			492
Share-based compensation expense	252			214
Deferred income taxes	(44		)	(128		)
Change in assets and liabilities:
Fiduciary receivables	174			766
Short-term investments — funds held on behalf of clients	(1,285		)	(731		)
Fiduciary liabilities	1,111			(35		)
Receivables, net	(167		)	(11		)
Accounts payable and accrued liabilities	(385		)	(331		)
Restructuring reserves	(62		)	14
Current income taxes	3			(137		)
Pension, other postretirement and postemployment liabilities	(127		)	(223		)
Other assets and liabilities	90			139
Cash provided by operating activities	1,163			975
Cash flows from investing activities
Proceeds from investments	33			30
Payments for investments	(94		)	(65		)
Net sales (purchases) of short-term investments — non-fiduciary	(7		)	356
Acquisition of businesses, net of cash acquired	(39		)	(50		)
Sale of businesses, net of cash sold	43			(8		)
Capital expenditures	(167		)	(179		)
Cash provided by (used for) investing activities	(231		)	84
Cash flows from financing activities
Share repurchase	(1,507		)	(1,272		)
Issuance of shares for employee benefit plans	(133		)	(139		)
Issuance of debt	4,918			3,960
Repayment of debt	(3,858		)	(3,498		)
Cash dividends to shareholders	(307		)	(285		)
Noncontrolling interests and other financing activities	(81		)	(21		)
Cash used for financing activities	(968		)	(1,255		)
Effect of exchange rates on cash and cash equivalents	(18		)	(76		)
Net decrease in cash and cash equivalents	(54		)	(272		)
Cash and cash equivalents at beginning of period	656			756
Cash and cash equivalents at end of period	$	602		$	484
Supplemental disclosures:
Interest paid	$	196		$	172
Income taxes paid, net of refunds	$	279		$	274

See accompanying Notes to Condensed Consolidated Financial Statements (Unaudited).

7

Notes to Condensed Consolidated Financial Statements (Unaudited)

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto (the “Financial Statements”) have been prepared in accordance with United States U.S. generally accepted accounting principles (“U.S. GAAP”). The Financial Statements include the accounts of Aon plc and all of its controlled subsidiaries (“Aon” or the “Company”). Intercompany accounts and transactions have been eliminated. The Financial Statements include, in the opinion of management, all adjustments (consisting of normal recurring adjustments and reclassifications) necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows for all periods presented.

Certain information and disclosures normally included in the Financial Statements prepared in accordance with U.S. GAAP have been condensed or omitted. These Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The results for the three and nine months ended September 30, 2019 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2019.

Use of Estimates

The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the Financial Statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the Financial Statements in future periods.

2. Accounting Principles and Practices

Adoption of New Accounting Standards

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the Financial Accounting Standards Board (“FASB”) issued new accounting guidance related to reclassification of certain tax effects from accumulated other comprehensive income. The guidance allowed a reclassification from accumulated comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The guidance was effective for the Company in the first quarter of 2019. For the three and nine months ended September 30, 2019, there was no impact on the net income of the Company as Aon did not elect to reclassify stranded tax effects on the Condensed Consolidated Statement of Financial Position. It is the Company’s policy to release income tax effects from accumulated other comprehensive loss using the portfolio approach.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued new accounting guidance on targeted improvements to accounting for hedging activities. The new guidance amended its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The guidance eliminated the requirement to separately measure and report hedge ineffectiveness and required the effect of a hedging instrument to be presented in the same income statement line as the hedged item. The new guidance was effective for Aon in the first quarter of 2019 and the Company adopted it on a modified retrospective basis with no cumulative effect adjustment to accumulated other comprehensive income or corresponding adjustment to Retained earnings. Changes to the Condensed Consolidated Statement of Income and financial statement disclosures were applied prospectively. Under the new guidance, gains or losses on certain derivative hedging instruments are recognized in Revenue, as opposed to Other income (expense) under the previous guidance. For the three and nine months ended September 30, 2019, the adoption of this guidance had no impact on the net income and an insignificant impact on the operating income of the Company.

8

Leases

In February 2016, the FASB issued a new accounting standard on leases, which requires lessees to recognize assets and liabilities for most leases. Under the new standard, a lessee is required to recognize in the Consolidated Statements of Financial Position, liabilities to make future lease payments and right-of-use (“ROU”) assets representing its right to use the underlying assets for the lease term. The recognition, measurement, timing, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous U.S. GAAP.

The Company adopted the new standard as of January 1, 2019, using the modified retrospective approach for all leases existing at, or entered into after, the period of adoption. Under this approach, prior periods were not restated. Rather, lease balances and other disclosures for prior periods were provided in the notes to the financial statements as previously reported, and the cumulative effect of initially applying the guidance was recognized in the Condensed Consolidated Statement of Financial Position as of September 30, 2019.

The modified retrospective approach includes several optional practical expedients available that entities may elect to apply upon transition. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. The Company elected the package of practical expedients permitted under the transition guidance within the new standard, which allows a lessee to carryforward their population of existing leases, the classification of each lease, as well as the treatment of initial direct costs as of the period of adoption. In addition, the Company elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration paid in a contract as a single lease component. Lastly, the Company did not elect the practical expedient related to hindsight analysis which allows a lessee to use hindsight in determining the lease term and in assessing impairment of the entity’s ROU assets.

The Company has made a policy election to not recognize ROU assets and lease liabilities that arise from leases with an initial term of twelve months or less on the Condensed Consolidated Statements of Financial Position. However, the Company will recognize these lease payments in the Condensed Consolidated Statements of Income on a straight-line basis over the lease term and variable lease payments in the period in which the obligation is incurred. The Company has chosen to apply this accounting policy across all classes of underlying assets. Additionally, upon adoption, the Company utilized a discount rate to determine the present value of the lease payments based on information available as of January 1, 2019.

Beginning January 1, 2019, operating ROU assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the commencement date. Operating leases in effect prior to January 1, 2019 were recognized at the present value of the remaining payments on the remaining lease term as of January 1, 2019. Upon adoption, the Company recognized ROU assets and lease liabilities of $1.1 billion and $1.3 billion, respectively. The standard had an insignificant impact on the Condensed Consolidated Statements of Income and no impact on the Condensed Consolidated Statements of Cash Flows. Refer to Note 20 “Lease Commitments” for further information including significant assumptions and judgments made.

As a result of applying the modified retrospective approach to adopt the new leasing standard, the following adjustments were made to the Condensed Consolidated Statement of Financial Position as of January 1, 2019 (in millions):

	December 31, 2018					January 1, 2019
	As Reported		Adjustments			As Adjusted
Assets
Operating lease right-of-use assets	$	—	$	1,021		$	1,021
Other non-current assets	$	448	$	78		$	526
Liabilities
Other current liabilities	$	936	$	219		$	1,155
Non-current operating lease liabilities	$	—	$	1,014		$	1,014
Other non-current liabilities	$	1,097	$	(134	)	$	963

9

Accounting Standards Issued But Not Yet Adopted

Cloud Computing Arrangements

In August 2018, the FASB issued new accounting guidance on implementation costs incurred in a cloud computing arrangement that is a service contract. The new guidance aligns capitalization requirements for certain implementation costs incurred in cloud computing arrangements with existing requirements for capitalizing implementation costs for internal-use software. These costs will be deferred over the term of the hosting arrangement, including any optional renewal periods the entity is reasonably certain to exercise. An entity may apply the new guidance on either a prospective or retrospective basis. The new guidance is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting guidance in the first quarter of 2020 on a prospective basis for all implementation costs incurred after the date of initial adoption.

Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued new accounting guidance related to the disclosure requirements for employers that sponsor defined benefit pension and other postretirement benefit plans. The guidance requires sponsors of these plans to provide additional disclosures, including weighted average interest rates used in the entity’s cash balance pension plans and a narrative description of reasons for any significant gains or losses impacting the benefit obligation for the period, and eliminates certain previous disclosure requirements. The new guidance is effective for Aon in the first quarter of 2021 with early adoption permitted and will be applied retrospectively. The Company is currently evaluating the impact that the guidance will have on the Financial Statements and the period of adoption.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued new accounting guidance on simplifying the test for goodwill impairment. Currently the standard requires an entity to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. The new guidance removes Step 2. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. An entity will apply the new guidance on a prospective basis. The new guidance is effective for Aon in the first quarter of 2020 and early adoption is permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new guidance in the first quarter of 2020.

Credit Losses

In June 2016, the FASB issued a new accounting standard on the measurement of credit losses on financial instruments. The new standard replaces the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. An entity will apply the new standard through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the standard is effective. The new standard is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting standard in the first quarter of 2020.

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3. Revenue from Contracts with Customers

Disaggregation of Revenue

The following table summarizes revenue from contracts with customers by principal service line (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Commercial Risk Solutions	$	1,057		$	1,029		$	3,342		$	3,379
Reinsurance Solutions	291			279			1,499			1,401
Retirement Solutions	484			501			1,323			1,356
Health Solutions	279			278			1,082			1,038
Data & Analytic Services	271			263			893			834
Elimination	(3		)	(1		)	(11		)	(8		)
Total revenue	$	2,379		$	2,349		$	8,128		$	8,000

Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
United States	$	1,209	$	1,215	$	3,516	$	3,456
Americas other than United States	256		203		723		683
United Kingdom	358		264		1,210		1,161
Europe, Middle East, & Africa other than United Kingdom	283		399		1,793		1,871
Asia Pacific	273		268		886		829
Total revenue	$	2,379	$	2,349	$	8,128	$	8,000

Contract Costs

An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	216		$	216		$	329		$	298
Additions	326			332			1,008			1,043
Amortization	(299		)	(305		)	(1,095		)	(1,090		)
Impairment	—			—			—			—
Foreign currency translation and other	(4		)	5			(3		)	(3		)
Balance at end of period	$	239		$	248		$	239		$	248

An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	161		$	144		$	156		$	145
Additions	14			16			40			37
Amortization	(11		)	(9		)	(33		)	(30		)
Impairment	—			—			—			—
Foreign currency translation and other	(1		)	(1		)	—			(2		)
Balance at end of period	$	163		$	150		$	163		$	150

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4. Cash and Cash Equivalents and Short-term Investments

Cash and cash equivalents include cash balances and all highly liquid instruments with initial maturities of three months or less.  Short-term investments consist of money market funds. The estimated fair value of cash and cash equivalents and short-term investments approximates their carrying values.

At September 30, 2019, Cash and cash equivalents and Short-term investments were $779 million compared to $828 million at December 31, 2018, a decrease of $49 million. Of the total balances, $96 million and $91 million were restricted as to their use at September 30, 2019 and December 31, 2018, respectively. Included within Short-term investments as of September 30, 2019 and December 31, 2018 were £42.7 million ($52.6 million at September 30, 2019 exchange rates and $53.9 million at December 31, 2018 exchange rates) of operating funds required to be held by the Company in the United Kingdom (the “U.K.”) by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator.

5. Other Financial Data

Condensed Consolidated Statements of Income Information

Other Income (Expense)

Other income (expense) consists of the following (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Foreign currency remeasurement	$	17		$	3		$	17		$	16
Disposal of businesses	1			(3		)	8			(4		)
Pension and other postretirement	3			—			12			(5		)
Equity earnings	1			1			3			3
Financial instruments	(20		)	—			(32		)	(27		)
Total	$	2		$	1		$	8		$	(17	)

Condensed Consolidated Statements of Financial Position Information

Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	65		$	62		$	64		$	59
Provision charged to Other general expense	7			9			19			21
Accounts written off, net of recoveries	(6		)	(8		)	(17		)	(17		)
Foreign currency translation and other	1			3			1			3
Balance at end of period	$	67		$	66		$	67		$	66

Other Current Assets

The components of Other current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to fulfill contracts with customers (1)	$	239	$	329
Prepaid expenses	123		97
Taxes receivable	177		113
Other (2)	92		79
Total	$	631	$	618

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2) December 31, 2018 includes $12 million previously classified as “Receivables from the Divested Business”.

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Other Non-Current Assets

The components of Other non-current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to obtain contracts with customers (1)	$	163	$	156
Taxes receivable	100		100
Leases (2)	106		—
Investments	52		54
Other	141		138
Total	$	562	$	448

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2) Refer to Note 20 “Lease Commitments” for further information.

Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Deferred revenue (1)	$	256	$	251
Leases (2)	218		—
Taxes payable	152		83
Other	537		602
Total	$	1,163	$	936

(1) During the three and nine months ended September 30, 2019, $144 million and $385 million, respectively, was recognized in the Condensed Consolidated Statements of Income. During the three and nine months ended September 30, 2018, $133 million and $348 million, respectively, was recognized in the Condensed Consolidated Statements of Income.

(2) Refer to Note 20 “Lease Commitments” for further information.

Other Non-Current Liabilities

The components of Other non-current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Taxes payable (1)	$	578	$	585
Leases	82		169
Deferred revenue	59		65
Compensation and benefits	48		56
Other	186		222
Total	$	953	$	1,097

(1) Includes $218 million and $240 million for the non-current portion of the one-time mandatory transition tax on accumulated foreign earnings as of September 30, 2019 and December 31, 2018, respectively.

6. Discontinued Operations

On February 9, 2017, the Company entered into a Purchase Agreement with Tempo Acquisition, LLC (the “Purchase Agreement”) to sell its benefits administration and business process outsourcing business (the “Divested Business”) to an entity formed and controlled by affiliates of The Blackstone Group L.P. (the “Buyer”) and certain designated purchasers that are direct or indirect subsidiaries of the Buyer.

On May 1, 2017, the Buyer purchased all of the outstanding equity interests of the Divested Business, plus certain related assets and liabilities, for a purchase price of $4.3 billion in cash paid at closing, subject to customary adjustments set forth in the Purchase Agreement, and deferred consideration of up to $500 million (the “Transaction”). Cash proceeds after customary adjustments and before taxes due were $4.2 billion.

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Aon and the Buyer entered into certain transaction-related agreements at the closing, including two commercial agreements, a transition services agreement, certain intellectual property license agreements, subleases, and other customary agreements. Aon expects to continue to be a significant client of the Divested Business and the Divested Business has agreed to use Aon for its broking and other services for a specified period of time.

The financial results of the Divested Business for the three and nine months ended September 30, 2019 and 2018 are presented as Net income (loss) from discontinued operations on the Company’s Condensed Consolidated Statements of Income. The following table presents the financial results of the Divested Business (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Expenses
Total operating expenses	$	1		$	4		$	2		$	7
Loss from discontinued operations before income taxes	(1		)	(4		)	(2		)	(7		)
Income tax benefit	—			(2		)	(1		)	(3		)
Net loss from discontinued operations excluding gain	(1		)	(2		)	(1		)	(4		)
Gain on sale of discontinued operations, net of tax	—			—			—			9
Net income (loss) from discontinued operations	$	(1	)	$	(2	)	$	(1	)	$	5

There were no cash or cash equivalents of discontinued operations at September 30, 2019.

7. Restructuring

In 2017, Aon initiated a global restructuring plan (the “Restructuring Plan”) in connection with the sale of the Divested Business. The Restructuring Plan is intended to streamline operations across the organization and deliver greater efficiency, insight, and connectivity. The Company expects these restructuring activities and related expenses to affect continuing operations through the fourth quarter of 2019. The Company also estimates there to be 5,400 to 5,600 total role eliminations associated with the Restructuring Plan. In the second quarter of 2019, Aon updated the Restructuring Plan for additional opportunities that were identified in the quarter, which are expected to result in additional estimated charges of $125 million in 2019.

The Restructuring Plan is expected to result in cumulative charges of approximately $1,350 million through the end of the plan, consisting of approximately $550 million in workforce reduction, $125 million in technology rationalization costs, $80 million in lease consolidation costs, $50 million in non-cash asset impairments, and $545 million in other costs, including certain separation costs associated with the sale of the Divested Business.

From the inception of the Restructuring Plan through September 30, 2019, the Company has eliminated 5,353 positions and incurred total charges of $1,263 million for restructuring and related separation costs. These charges are included in Compensation and benefits, Information technology, Premises, Depreciation of fixed assets, and Other general expense in the accompanying Condensed Consolidated Statements of Income.

The following table summarizes restructuring and separation costs by type that have been incurred through September 30, 2019 and are estimated to be incurred through the end of the Restructuring Plan (in millions). Estimated costs by type have been revised based on updated assumptions:

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019		Inception to Date		Estimated Remaining Costs		Estimated Total Cost (1)
Workforce reduction	$	9	$	111	$	525	$	25	$	550
Technology rationalization (2)	14		29		109		16		125
Lease consolidation (2)	3		17		53		27		80
Asset impairments	5		7		46		4		50
Other costs associated with restructuring and separation (2) (3)	32		117		530		15		545
Total restructuring and related expenses	$	63	$	281	$	1,263	$	87	$	1,350

(1) Actual costs, when incurred, may vary due to changes in the assumptions built into the Restructuring Plan. Significant assumptions that may change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss

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calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives. Estimated Total Cost includes $100 million of non-cash charges.

(2) Total contract termination costs incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs, respectively, associated with restructuring and separation for the three months ended September 30, 2019 were $9 million, $2 million, and $18 million; for the nine months ended September 30, 2019, were $12 million, $15 million, and $21 million; and since inception of the Restructuring Plan, were $18 million, $48 million, and $109 million. Total estimated contract termination costs expected to be incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs associated with restructuring and separation, are $20 million, $80 million, and $116 million, respectively.

(3) Other costs associated with the Restructuring Plan include those to separate the Divested Business, as well as moving costs, and consulting and legal fees. These costs are generally recognized when incurred.

The changes in the Company’s liabilities for the Restructuring Plan as of September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	201
Expensed	260
Cash payments	(322		)
Foreign currency translation	(1		)
Balance as of September 30, 2019	$	138

8. Acquisitions and Dispositions of Businesses

Completed Acquisitions

The Company completed three acquisitions during the nine months ended September 30, 2019 and five acquisitions during the nine months ended September 30, 2018. The following table includes the fair values of consideration transferred, assets acquired, and liabilities assumed as a result of the Company’s acquisitions (in millions):

	Nine Months Ended September 30, 2019
Consideration Transferred	$	42
Deferred and contingent consideration	8
Aggregate consideration transferred	$	50
Assets acquired
Cash and cash equivalents	$	4
Receivables, net	1
Goodwill	33
Intangible assets, net	22
Fixed assets, net	1
Other assets	13
Total assets acquired	74
Liabilities assumed
Current liabilities	18
Other non-current liabilities	6
Total liabilities assumed	24
Net assets acquired	$	50

The results of operations of these acquisitions are included in the Financial Statements as of the respective acquisition dates. The Company’s results of operations would not have been materially different if these acquisitions had been reported from the beginning of the period in which they were acquired.

2019 Acquisitions

On July 31, 2019, the Company completed the transaction to acquire Ovatio Courtage SAS, an insurance broker based in France.

On July 31, 2019, the Company completed the transaction to acquire Zalba-Caldu Correduria de Seguros, S.A., a Spanish insurance broker.

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On January 1, 2019, the Company completed the transaction to acquire Chapka Assurances SAS based in France.

2018 Acquisitions

On May 9, 2018, the Company completed the transaction to acquire certain assets of 601West, a division of Lee & Hayes, P.L.L.C. based in the United States.

On April 24, 2018, the Company completed the transaction to acquire Inspiring Benefits, S.L., a Spain-based firm specialized in employee loyalty, wellbeing, and rewards programs.

On March 1, 2018, the Company completed the transaction to acquire the business and assets of the trade credit business of Niche International Business Proprietary Limited, a trade credit brokerage based in Johannesburg, South Africa.

On March 1, 2018, the Company completed the transaction to acquire Affinity Risk Partners (Brokers) Pty. Ltd., an insurance broker in Victoria, Australia.

On January 19, 2018, the Company completed the transaction to acquire substantially all of the assets of The Burchfield Group, a provider in pharmacy benefit consulting, auditing, and health plan compliance services based in the United States.

Completed Dispositions

The Company completed two dispositions during the three months ended September 30, 2019 and six dispositions during the nine months ended September 30, 2019. The Company completed two dispositions during the three months ended September 30, 2018 and three dispositions during the nine months ended September 30, 2018.

Total pretax gains recognized for the three and nine months ended September 30, 2019 were $1 million and $8 million, respectively. Total losses, net of gains, recognized for the three and nine months ended September 30, 2018 were $3 million and $4 million, respectively. Gains and losses recognized as a result of a disposition are included in Other income (expense) in the Condensed Consolidated Statements of Income.

9. Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill for the nine months ended September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	8,171
Goodwill related to current year acquisitions	33
Goodwill related to disposals	(10		)
Goodwill related to prior year acquisitions	2
Foreign currency translation and other	(125		)
Balance as of September 30, 2019	$	8,071

Other intangible assets by asset class are as follows (in millions):

	September 30, 2019						December 31, 2018
	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
Customer related and contract based	$	2,229	$	1,531	$	698	$	2,240	$	1,444	$	796
Tradenames	1,025		899		126		1,027		740		287
Technology and other	375		325		50		391		325		66
Total	$	3,629	$	2,755	$	874	$	3,658	$	2,509	$	1,149

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The estimated future amortization for finite lived intangible assets as of September 30, 2019 is as follows (in millions):

Remainder of 2019	$	96
2020	220
2021	126
2022	86
2023	76
2024	59
Thereafter	211
Total	$	874

10. Debt

Notes

In September 2019, the Company’s $600 million 5.00% Senior Notes due September 2020 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statement of Financial Position as the date of maturity is in less than one year.

On May 2, 2019, Aon Corporation issued $750 million 3.75% Senior Notes due May 2029. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

On December 3, 2018, Aon Corporation issued $350 million 4.50% Senior Notes due December 2028. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

On March 8, 2018, the Company’s CAD 375 million ($291 million at March 8, 2018 exchange rates) 4.76% Senior Note due March 2018 issued by a Canadian subsidiary of Aon Corporation matured and was repaid in full.

Revolving Credit Facilities

As of September 30, 2019, Aon plc had two primary committed credit facilities outstanding: its $900 million multi-currency U.S. credit facility expiring in February 2022 and its $400 million multi-currency U.S. credit facility expiring in October 2022 (collectively, the “2022 Facilities”). On October 19, 2019, the Company extended the $400 million multi-currency U.S. credit facility expiring in October 2022 by one year, and it will now expire in October 2023.

Each of these facilities includes customary representations, warranties and covenants, including financial covenants that require Aon to maintain specified ratios of adjusted consolidated earnings before interest, taxes, depreciation, and amortization (“EBITDA”) to consolidated interest expense and consolidated debt to adjusted consolidated EBITDA, in each case, tested quarterly. At September 30, 2019, Aon did not have borrowings under the 2022 Facilities, and was in compliance with the financial covenants and all other covenants contained therein during the rolling twelve months ended September 30, 2019.

Commercial Paper

Aon Corporation, a wholly owned subsidiary of Aon plc, has established a U.S. commercial paper program and Aon plc has established a European multi-currency commercial paper program. Commercial paper may be issued in aggregate principal amounts of up to $600 million under the U.S. program and €525 million under the European program, not to exceed the amount of the Company’s committed credit, which was $1.3 billion at September 30, 2019. The U.S. commercial paper program is fully and unconditionally guaranteed by Aon plc and the European multi-currency commercial paper program is fully and unconditionally guaranteed by Aon Corporation.

Commercial paper outstanding, which is included in Short-term debt and current portion of long-term debt in the Company’s Condensed Consolidated Statements of Financial Position, is as follows (in millions):

As of	September 30, 2019		December 31, 2018
Commercial paper outstanding	$	546	$	250

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The weighted average commercial paper outstanding and its related interest rates are as follows (in millions, except percentages):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019		2018
Weighted average commercial paper outstanding	$	656		$	820		541		$	566
Weighted average interest rate of commercial paper outstanding	0.15		%	0.79		%	0.43	%	0.83		%

11. Income Taxes

The effective tax rates on net income from continuing operations were 19.6% and 16.6% for the three and nine months ended September 30, 2019, respectively. The effective tax rates on net income from continuing operations were 20.1% and 1.1% for the three and nine months ended September 30, 2018, respectively.

For the three months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, and certain discrete items.

For the three months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income and certain discrete items including return to accrual adjustments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, as well as certain favorable discrete items, primarily the impact of shared-based payments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income including restructuring charges, legacy litigation, and the impairment charge related to certain assets and liabilities previously classified as held for sale. The tax rate was also impacted by certain discrete items including the net tax benefit associated with the sale of certain assets and liabilities previously classified as held for sale, the impact of share-based payments, and changes in the assertion for unremitted earnings.

12. Shareholders’ Equity

Ordinary Shares

Aon has a share repurchase program authorized by the Company’s Board of Directors (the “Repurchase Program”). The Repurchase Program was established in April 2012 with $5.0 billion in authorized repurchases, and was increased by $5.0 billion in authorized repurchases in each of November 2014 and February 2017 for a total of $15.0 billion in repurchase authorizations.

Under the Repurchase Program, Class A Ordinary Shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital.

The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):

	Three Months Ended September 30				Nine Months Ended September 30
	2019 (1)		2018		2019 (1)		2018
Shares repurchased	1.8		2.1		8.2		8.8
Average price per share	$	190.83	$	145.71	$	183.26	$	142.15
Costs recorded to retained earnings
Total repurchase cost	$	350	$	300	$	1,500	$	1,250
Additional associated costs	—		1		7		6
Total costs recorded to retained earnings	$	350	$	301	$	1,507	$	1,256

(1) Included in the 1.8 million and 8.2 million shares repurchased during the three and nine months ended September 30, 2019, respectively, were 25 thousand shares that did not settle until October 2019. These shares were settled at an average price per share of $193.91 and total cost of $4.8 million.

At September 30, 2019, the remaining authorized amount for share repurchase under the Repurchase Program was $2.5 billion. Under the Repurchase Program, the Company has repurchased a total of 126.5 million shares for an aggregate cost of approximately $12.5 billion.

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Net Income Per Share

Weighted average ordinary shares outstanding are as follows (in millions):

	Three Months Ended September 30		Nine Months Ended September 30
	2019	2018	2019	2018
Basic weighted average ordinary shares outstanding	236.9	244.0	239.9	246.2
Dilutive effect of potentially issuable shares	2.2	1.6	2.0	1.5
Diluted weighted average ordinary shares outstanding	239.1	245.6	241.9	247.7

Potentially issuable shares are not included in the computation of diluted net income per share if their inclusion would be antidilutive. There were no shares excluded from the calculation for the three and nine months ended September 30, 2019 or September 30, 2018.

Accumulated Other Comprehensive Loss

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Financial Instruments (1)			Foreign Currency Translation Adjustments			Postretirement Benefit Obligation (2)			Total
Balance at December 31, 2018	$	(15	)	$	(1,319	)	$	(2,575	)	$	(3,909	)
Other comprehensive income (loss) before reclassifications, net	(12		)	(180		)	2			(190		)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income	12			—			79			91
Tax expense	(3		)	—			(19		)	(22		)
Amounts reclassified from accumulated other comprehensive income, net	9			—			60			69
Net current period other comprehensive income (loss)	(3		)	(180		)	62			(121		)
Balance at September 30, 2019	$	(18	)	$	(1,499	)	$	(2,513	)	$	(4,030	)

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Revenue, Interest expense, and Compensation and benefits in the accompanying Condensed Consolidated Statements of Income. Refer to Note 15 “Derivatives and Hedging” for further information regarding the Company’s derivative and hedging activity.

(2) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense).

13. Employee Benefits

The following table provides the components of the net periodic (benefit) cost recognized in the Condensed Consolidated Statements of Income for Aon’s significant U.K., U.S., and other major pension plans, which are located in the Netherlands and Canada. Service cost is reported in Compensation and benefits and all other components are reported in Other income (expense) as follows (in millions):

	Three Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	26			26			27			24			6			6
Expected return on plan assets, net of administration expenses	(46		)	(46		)	(34		)	(36		)	(9		)	(11		)
Amortization of prior-service cost	—			1			1			—			—			—
Amortization of net actuarial loss	7			6			13			15			3			3
Net periodic (benefit) cost	(13		)	(13		)	7			3			—			(2		)
Loss on pension settlement	—			9			—			—			—			—
Total net periodic (benefit) cost	$	(13	)	$	(4	)	$	7		$	3		$	—		$	(2	)

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	Nine Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	81			84			81			74			20			20
Expected return on plan assets, net of administration expenses	(143		)	(147		)	(102		)	(108		)	(29		)	(34		)
Amortization of prior-service cost	1			1			2			1			—			—
Amortization of net actuarial loss	22			21			40			45			9			9
Net periodic (benefit) cost	(39		)	(41		)	21			12			—			(5		)
Loss on pension settlement	—			32			—			—			—			—
Total net periodic (benefit) cost	$	(39	)	$	(9	)	$	21		$	12		$	—		$	(5	)

In March 2017, the Company approved a plan to offer a voluntary one-time lump sum payment option to certain eligible employees of the Company’s U.K. pension plans that, if accepted, would settle the Company’s pension obligations to them. The lump sum cash payment offer closed during 2018. For the nine months ended September 30, 2018, lump sum payments from plan assets of £125 million ($164 million using September 30, 2018 exchange rates) were paid. As a result of this settlement, the Company remeasured the assets and liabilities of the U.K. pension plan during the third quarter of 2018, which in aggregate resulted in a reduction to the projected benefit obligation of £108 million ($143 million using September 30, 2018 exchange rates), as well as a non-cash settlement charge of £7 million ($9 million using average September 30, 2018 exchange rates) in the third quarter of 2018 and £24 million ($32 million using average exchange rates) for the nine months ended September 30, 2018.

Contributions

The Company expects to make total cash contributions of approximately $80 million, $46 million, and $19 million, based on exchange rates as of December 31, 2018, to its significant U.K., U.S., and other major pension plans, respectively, during 2019. The following table summarizes contributions made to the Company’s significant pension plans (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Contributions to U.K. pension plans	$	19	$	27	$	65	$	75
Contributions to U.S. pension plans (1)	7		108		30		133
Contributions to other major pension plans	3		3		13		14
Total contributions	$	29	$	138	$	108	$	222

(1) Includes the Company’s contribution to the qualified U.S. pension plan of $100 million for the three and nine months ended September 30, 2018, which allowed the pension contribution tax deduction to be taken at the 2017 federal tax rate of 35%.

14. Share-Based Compensation Plans

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Restricted share units (“RSUs”)	$	42	$	41	$	155	$	145
Performance share awards (“PSAs”)	28		24		90		63
Employee share purchase plans	2		2		7		6
Total share-based compensation expense	$	72	$	67	$	252	$	214

Restricted Share Units

RSUs generally vest between three and five years. The fair value of RSUs is based upon the market value of Aon plc ordinary shares at the date of grant. With certain limited exceptions, any break in continuous employment will cause the forfeiture of all non-vested awards. Compensation expense associated with RSUs is recognized on a straight-line basis over the requisite service period. Dividend equivalents are paid on certain RSUs, based on the initial grant amount.

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The following table summarizes the status of the Company’s RSUs, including shares related to the Divested Business (shares in thousands, except fair value):

	Nine Months Ended September 30, 2019				Nine Months Ended September 30, 2018
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	4,208		$	120	4,849		$	104
Granted	1,225		$	174	1,409		$	140
Vested	(1,551	)	$	112	(1,772	)	$	97
Forfeited	(164	)	$	128	(158	)	$	111
Non-vested at end of period	3,718		$	141	4,328		$	118

(1) Represents per share weighted average fair value of award at date of grant.

Unamortized deferred compensation expense amounted to $384 million as of September 30, 2019, with a remaining weighted average amortization period of approximately 2.1 years.

Performance Share Awards

The vesting of PSAs is contingent upon meeting a cumulative level of earnings per share related performance over a three-year period. The actual issuance of shares may range from 0-200% of the target number of PSAs granted, based on the terms of the plan and level of achievement of the related performance target. The grant date fair value of PSAs is based upon the market price of Aon plc ordinary shares at the date of grant. The performance conditions are not considered in the determination of the grant date fair value for these awards. Compensation expense is recognized over the performance period based on management’s estimate of the number of units expected to vest. Management evaluates its estimate of the actual number of shares expected to be issued at the end of the programs on a quarterly basis. The cumulative effect of the change in estimate is recognized in the period of change as an adjustment to Compensation and benefits in the Condensed Consolidated Statements of Income, if necessary. Dividend equivalents are not paid on PSAs.

The following table summarizes the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the nine months ended September 30, 2019 and the years ended December 31, 2018 and 2017, respectively (shares in thousands and dollars in millions, except fair value):

	September 30, 2019		December 31, 2018		December 31, 2017
Target PSAs granted during period	467		564		548
Weighted average fair value per share at date of grant	$	164	$	134	$	114
Number of shares that would be issued based on current performance levels	458		958		1,057
Unamortized expense, based on current performance levels	$	61	$	54	$	10

15. Derivatives and Hedging

The Company is exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, the Company enters into various derivative instruments that reduce these risks by creating offsetting exposures. The Company does not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it earns revenues, pays expenses, enters into monetary intercompany transfers, or other transactions denominated in a currency that differs from its functional currency. The Company uses foreign exchange derivatives, typically forward contracts, options and cross currency swaps, to reduce its overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than 2 years. These derivatives are accounted for as hedges, and changes in fair value are recorded each period in Other comprehensive income (loss) in the Condensed Consolidated Statements of Comprehensive Income.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to economically hedge the currency exposure of the Company’s global liquidity profile, including monetary assets or liabilities that are denominated in a non-functional currency of an entity, typically on a rolling 30-day basis, but may be for up to 1 year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income (expense) in the Condensed Consolidated Statements of Income.

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The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Net Amount of Derivative Assets  Presented in the Statements of Financial Position (1)				Net Amount of Derivative Liabilities  Presented in the Statements of Financial Position (2)
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Foreign exchange contracts
Accounted for as hedges	$	607	$	646	$	10	$	17	$	1	$	2
Not accounted for as hedges (3)	313		269		—		1		1		6
Total	$	920	$	915	$	10	$	18	$	2	$	8

(1) Included within Other current assets ($3 million at September 30, 2019 and $3 million at December 31, 2018) or Other non-current assets ($7 million at September 30, 2019 and $15 million at December 31, 2018).

(2) Included within Other current liabilities ($2 million at September 30, 2019 and $5 million at December 31, 2018) or Other non-current liabilities ($3 million at December 31, 2018).

(3) These contracts typically are for 30 day durations and executed close to the last day of the most recent reporting month, thereby resulting in nominal fair values at the balance sheet date.

The amounts of derivative gains (losses) recognized in the Financial Statements are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Loss recognized in Accumulated other comprehensive loss	$	(6	)	$	(3	)	$	(14	)	$	(14	)

The amounts of derivative gains (losses) reclassified from Accumulated other comprehensive loss into the Condensed Consolidated Statements of Income are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Total revenue (1)	$	(4	)	$	—		$	(11	)	$	—
Compensation and benefits	—			—			—			1
Other general expense	—			—			—			(2		)
Interest expense	—			—			(1		)	(1		)
Other income (expense) (1)	—			(3		)	—			(7		)
Total	$	(4	)	$	(3	)	$	(12	)	$	(9	)

(1) With the adoption of new hedge accounting guidance in the first quarter of 2019, gains (losses) on derivatives accounted for as hedges are recognized in Total revenue in the Company’s Condensed Consolidated Statements of Income rather than Other income (expense). Refer to Note 2 “Accounting Principles and Practices” for additional details.

The Company estimates that approximately $14 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

During the three and nine months ended September 30, 2019, the Company recorded losses of $16 million and $20 million, respectively, in Other income (expense) for foreign exchange derivatives not accounted for as hedges. During the three and nine months ended September 30, 2018, the Company recorded losses of $4 million and $15 million, respectively, in Other income (expense) for foreign exchange derivatives not accounted for as hedges.

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Net Investments in Foreign Operations Risk Management

The Company uses non-derivative financial instruments to protect the value of its investments in a number of foreign subsidiaries. The Company has designated a portion of its euro-denominated commercial paper issuances as a non-derivative hedge of the foreign currency exposure of a net investment in its European operations. The change in fair value of the designated portion of the euro-denominated commercial paper due to changes in foreign currency exchange rates is recorded in Foreign currency translation adjustment, a component of Accumulated other comprehensive loss, to the extent it is effective as a hedge. The foreign currency translation adjustment of the hedged net investments is also recorded in Accumulated other comprehensive loss. Ineffective portions of net investment hedges, if any, are reclassified from Accumulated other comprehensive loss into earnings during the period of change.

The Company had €500 million ($546 million at September 30, 2019 exchange rates) and €220 million ($250 million at December 31, 2018 exchange rates) of outstanding euro-denominated commercial paper at September 30, 2019 and December 31, 2018, respectively, designated as a hedge of the foreign currency exposure of its net investment in its European operations. The unrealized gain recognized in Accumulated other comprehensive loss related to the net investment non derivative hedging instrument was $38 million and $21 million, as of September 30, 2019 and December 31, 2018, respectively.

The Company did not reclassify any deferred gains or losses related to net investment hedges from Accumulated other comprehensive loss to earnings during the three and nine months ended September 30, 2019 and 2018.

16. Fair Value Measurements and Financial Instruments

Accounting standards establish a three tier fair value hierarchy that prioritizes the inputs used in measuring fair values as follows:

• Level 1 — observable inputs such as quoted prices for identical assets in active markets;

• Level 2 — inputs other than quoted prices for identical assets in active markets, that are observable either directly or indirectly; and

• Level 3 — unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.

The following methods and assumptions are used to estimate the fair values of the Company’s financial instruments:

Money market funds consist of institutional prime, treasury, and government money market funds. The Company reviews treasury and government money market funds to obtain reasonable assurance that the fund net asset value is $1 per share, and reviews the floating net asset value of institutional prime money market funds for reasonableness. 

Equity investments consist of domestic and international equity securities and equity derivatives valued using the closing stock price on a national securities exchange. Over the counter equity derivatives are valued using observable inputs such as underlying prices of the underlying security and volatility. On a sample basis the Company reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and independently verifies the observable inputs for Level 2 equity derivatives and securities.

Fixed income investments consist of certain categories of bonds and derivatives. Corporate, government, and agency bonds are valued by pricing vendors who estimate fair value using recently executed transactions and proprietary models based on observable inputs, such as interest rate spreads, yield curves, and credit risk. Asset-backed securities are valued by pricing vendors who estimate fair value using discounted cash flow models utilizing observable inputs based on trade and quote activity of securities with similar features. Fixed income derivatives are valued by pricing vendors using observable inputs such as interest rates and yield curves. The Company obtains an understanding of the models, inputs, and assumptions used in developing prices provided by its vendors through discussions with the fund managers. The Company independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and historically are not material to the fair value estimates used in the Financial Statements.

Derivatives are carried at fair value, based upon industry standard valuation techniques that use, where possible, current market-based or independently sourced pricing inputs, such as interest rates, currency exchange rates, or implied volatilities.

Debt is carried at outstanding principal balance, less any unamortized issuance costs, discount or premium. Fair value is based on quoted market prices or estimates using discounted cash flow analyses based on current borrowing rates for similar types of borrowing arrangements.

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The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at September 30, 2019 and December 31, 2018 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,851	$	1,851	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	1	$	—	$	1	$	—
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—
Liabilities
Derivatives (2)
Gross foreign exchange contracts	$	3	$	—	$	3	$	—

			Fair Value Measurements Using
	Balance at December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,759	$	1,759	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	2	$	—	$	2	$	—
Derivatives (2)
Gross foreign exchange contracts	$	21	$	—	$	21	$	—
Liabilities					0
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—

(1) Included within Fiduciary assets or Short-term investments in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. 

(2) Refer to Note 15 “Derivatives and Hedging” for additional information regarding the Company’s derivatives and hedging activity. 

There were no transfers of assets or liabilities between fair value hierarchy levels in either the nine months ended September 30, 2019 or 2018. The Company recognized no realized or unrealized gains or losses in the Condensed Consolidated Statements of Income during either the nine months ended September 30, 2019 or 2018, related to assets and liabilities measured at fair value using unobservable inputs.

The fair value of debt is classified as Level 2 of the fair value hierarchy. The following table provides the carrying value and fair value for the Company’s term debt (in millions):

	September 30, 2019				December 31, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
Current portion of long-term debt	$	599	$	617	$	—	$	—
Long-term debt	$	6,120	$	6,915	$	5,993	$	6,159

17. Claims, Lawsuits, and Other Contingencies

Legal

Aon and its subsidiaries are subject to numerous claims, tax assessments, lawsuits and proceedings that arise in the ordinary course of business, which frequently include errors and omissions (“E&O”) claims. The damages claimed in these matters are or may be

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substantial, including, in many instances, claims for punitive, treble or extraordinary damages. While Aon maintains meaningful E&O insurance and other insurance programs to provide protection against certain losses that arise in such matters, Aon has exhausted or materially depleted its coverage under some of the policies that protect the Company and, consequently, is self-insured or materially self-insured for some claims. Accruals for these exposures, and related insurance receivables, when applicable, are included in the Condensed Consolidated Statements of Financial Position and have been recognized in Other general expense in the Condensed Consolidated Statements of Income to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Matters that are not probable and reasonably estimable are not accrued for in the financial statements.

The Company has included in the current matters described below certain matters in which (1) loss is probable, (2) loss is reasonably possible, that is, more than remote but not probable, or (3) there exists the reasonable possibility of loss greater than the accrued amount. In addition, the Company may from time to time disclose matters for which the probability of loss could be remote but the claim amounts associated with such matters are potentially significant. The reasonably possible range of loss for the matters described below for which loss is estimable, in excess of amounts that are deemed probable and estimable and therefore already accrued, is estimated to be between $0 and $0.1 billion, exclusive of any insurance coverage. These estimates are based on available information as of the date of this filing. As available information changes, the matters for which Aon is able to estimate may change, and the estimates themselves may change. In addition, many estimates involve significant judgment and uncertainty. For example, at the time of making an estimate, Aon may only have limited information about the facts underlying the claim, and predictions and assumptions about future court rulings and outcomes may prove to be inaccurate. Although management at present believes that the ultimate outcome of all matters described below, individually or in the aggregate, will not have a material adverse effect on the consolidated financial position of Aon, legal proceedings are subject to inherent uncertainties and unfavorable rulings or other events. Unfavorable resolutions could include substantial monetary or punitive damages imposed on Aon or its subsidiaries. If unfavorable outcomes of these matters were to occur, future results of operations or cash flows for any particular quarterly or annual period could be materially adversely affected.

Current Matters

A pensions consulting and administration subsidiary of Aon provided advisory services to the Trustees of the Gleeds pension fund in the United Kingdom and, on occasion, to the relevant employer of the fund.  In April 2014, the High Court, Chancery Division, London found that certain governing documents of the fund that sought to alter the fund’s benefit structure and that had been drafted by Aon were procedurally defective and therefore invalid. No lawsuit naming Aon as a party was filed, although a tolling agreement was entered. The High Court decision says that the additional liabilities in the pension fund resulting from the alleged defect in governing documents amount to approximately £45 million ($55 million at September 30, 2019 exchange rates). In December 2014, the Court of Appeal granted the employer leave to appeal the High Court decision. At a hearing in October 2016, the Court of Appeal approved a settlement of the pending litigation. On October 31, 2016, the fund’s trustees and employer sued Aon in the High Court, Chancery Division, London, alleging negligence and breach of duty in relation to the governing documents. The proceedings were served on Aon on December 20, 2016. The claimants seek damages of approximately £70 million ($86 million at September 30, 2019 exchange rates) plus interest and costs. In February 2018, the claimants instructed new lawyers and added their previous lawyers as defendants to the Aon lawsuit. Claimants have alleged that the previous lawyers were responsible for some of the losses sought from Aon because the lawyers gave negligent legal advice during the course of the High Court and Court of Appeal proceedings. Aon believes that it has meritorious defenses and intends to vigorously defend itself against this claim.

On October 3, 2017, Christchurch City Council (“CCC”) invoked arbitration to pursue a claim that it asserts against Aon New Zealand. Aon provided insurance broking services to CCC in relation to CCC’s 2010-2011 material damage and business interruption program. In December 2015, CCC settled its property and business interruption claim for its losses arising from the 2010-2011 Canterbury earthquakes against the underwriter of its material damage and business interruption program and the reinsurers of that underwriter. CCC contends that acts and omissions by Aon caused CCC to recover less in that settlement than it otherwise would have. CCC claims damages of approximately NZD 528 million ($333 million at September 30, 2019 exchange rates) plus interest and costs. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.

A retail insurance brokerage subsidiary of Aon was sued on September 6, 2018 in the United States District Court for the Southern District of New York by a client, Pilkington North America, Inc., that sustained damage from a tornado to its Ottawa, Illinois property. The lawsuit seeks between $45 million and $85 million in property and business interruption damages from either its insurer or Aon. The insurer contends that insurance proceeds were limited to $15 million in coverage by a windstorm sub-limit purportedly contained in the policy procured by Aon for Pilkington. The insurer therefore has tendered $15 million to Pilkington and denied coverage for the remainder of the loss. Pilkington sued the insurer and Aon seeking full coverage for the loss from the insurer or, in the alternative, seeking the same damages against Aon on various theories of professional liability if the court finds

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that the $15 million sub-limit applies to the claim. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims.    

In April 2017, the FCA announced an investigation relating to suspected competition law breaches in the aviation and aerospace broking industry, which, for Aon in 2016, represented less than $100 million in global revenue. The European Commission has now assumed jurisdiction over the investigation in place of the FCA. Other antitrust agencies outside the European Union are also conducting formal or informal investigations regarding these matters. Aon intends to work diligently with all antitrust agencies concerned to ensure they can carry out their work as efficiently as possible. At this time, in light of the uncertainties and many variables involved, Aon cannot estimate the ultimate impact on our company from these investigations or any related private litigation, nor any damages, penalties, or fines related to them. There can be no assurance that the ultimate resolution of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

Settled/Closed Matters

On June 29, 2015, Lyttelton Port Company Limited (“LPC”) sued Aon New Zealand in the Christchurch Registry of the High Court of New Zealand. LPC alleges, among other things, that Aon was negligent and in breach of contract in arranging LPC’s property insurance program for the period covering June 30, 2010 to June 30, 2011. LPC contended that acts and omissions by Aon caused LPC to recover less than it otherwise would have from insurers for losses suffered in the 2010 and 2011 Canterbury earthquakes. LPC claimed damages of approximately NZD 184 million ($116 million at September 30, 2019 exchange rates) plus interest and costs. In April 2019, the case was settled with no admission of liability on the part of Aon. The terms of this settlement did not have a significant impact on Aon’s results of operations or financial condition.

Guarantees and Indemnifications

The Company provides a variety of guarantees and indemnifications to its customers and others. The maximum potential amount of future payments represents the notional amounts that could become payable under the guarantees and indemnifications if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or other methods. These amounts may bear no relationship to the expected future payments, if any, for these guarantees and indemnifications. Any anticipated amounts payable are included in the Company’s Financial Statements, and are recorded at fair value.

The Company expects that, as prudent business interests dictate, additional guarantees and indemnifications may be issued from time to time.

Redomestication

In connection with the Redomestication, the Company on April 2, 2012 entered into various agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under issued and outstanding debt securities. Those agreements included the (1) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc, and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”) (amending and restating the Indenture, dated as of September 10, 2010, between Aon Corporation and the Trustee), (2) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of December 16, 2002, between Aon Corporation and the Trustee), and (3) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of January 13, 1997, as supplemented by the First Supplemental Indenture, dated as of January 13, 1997).

Sale of the Divested Business

In connection with the sale of the Divested Business, the Company guaranteed future operating lease commitments related to certain facilities assumed by the Buyer. The Company is obligated to perform under the guarantees if the Divested Business defaults on such leases at any time during the remainder of the lease agreements, which expire on various dates through 2025. As of September 30, 2019, the undiscounted maximum potential future payments under the lease guarantee is $74 million, with an estimated fair value of $14 million. No cash payments were made in connection to the lease commitments during the three and nine months ended September 30, 2019.

Additionally, the Company is subject to performance guarantee requirements under certain client arrangements that were assumed by the Buyer. Should the Divested Business fail to perform as required by the terms of the arrangements, the Company would be required to fulfill the remaining contract terms, which expire on various dates through 2023. As of September 30, 2019, the undiscounted maximum potential future payments under the performance guarantees were $160 million, with an estimated fair value of $1 million. No cash payments were made in connection to the performance guarantees during the three and nine months ended September 30, 2019.

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Letters of Credit

Aon has entered into a number of arrangements whereby the Company’s performance on certain obligations is guaranteed by a third party through the issuance of letters of credit (“LOCs”). The Company had total LOCs outstanding of approximately $71 million at September 30, 2019, compared to $83 million at December 31, 2018. These LOCs cover the beneficiaries related to certain of Aon’s U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for Aon’s own workers compensation program. The Company has also obtained LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. The maximum exposure with respect to such contractual contingent guarantees was approximately $83 million at September 30, 2019 compared to $103 million at December 31, 2018.

18. Segment Information

The Company operates as one segment that includes all of Aon’s continuing operations, which as a global professional services firm provides advice and solutions to clients focused on risk, retirement, and health through five revenue lines which make up its principal products and services. The Chief Operating Decision Maker (the “CODM”) assesses the performance of the Company and allocates resources based on one segment: Aon United.

The Company’s reportable operating segment has been determined using a management approach, which is consistent with the basis and manner in which Aon’s CODM uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance and allocates resources based on total Aon results against its key four metrics, including organic revenue growth, expense discipline, and collaborative behaviors that maximize value for Aon and its shareholders, regardless of which revenue line it benefits.

As Aon operates as one segment, segment profit or loss is consistent with consolidated reporting as disclosed on the Condensed Consolidated Statements of Income. Refer to Note 3 “Revenue from Contracts with Customers” for further information on revenue by principal service line.

19. Guarantee of Registered Securities

As described in Note 17 “Claims, Lawsuits, and Other Contingencies,” in connection with the Redomestication, Aon plc entered into various agreements pursuant to which it agreed to guarantee the obligations of Aon Corporation arising under issued and outstanding debt securities, including the 5.00% Notes due September 2020, the 8.205% Notes due January 2027, and the 6.25% Notes due September 2040 (collectively, the “Aon Corporation Notes”). Additionally, Aon plc has guaranteed the obligations of Aon Corporation arising under the 4.50% Senior Notes due 2028 and the 3.75% Senior Notes due 2029. Aon Corporation is a 100% indirectly owned subsidiary of Aon plc. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the Aon Corporation Notes.

In addition, Aon Corporation entered into an agreement pursuant to which it guaranteed the obligations of Aon plc arising under the 4.25% Notes due December 2042 exchanged for Aon Corporation’s outstanding 8.205% Notes due January 2027, and has also guaranteed the obligations of Aon plc arising under the 4.45% Notes due May 2043, the 4.00% Notes due November 2023, the 2.875% Notes due May 2026, the 3.50% Notes due June 2024, the 4.60% Notes due June 2044, the 4.75% Notes due May 2045, the 2.80% Notes due March 2021, and the 3.875% Notes due December 2025 (collectively, the “Aon plc Notes”). In each case, the guarantee of Aon Corporation is full and unconditional. There are no subsidiaries of Aon plc, other than Aon Corporation, that are guarantors of the Aon plc Notes. As a result of the existence of these guarantees, the Company has elected to present the financial information set forth in this footnote in accordance with Rule 3-10 of Regulation S-X.

In the fourth quarter of 2018, Aon plc obtained direct ownership in two subsidiaries that were previously indirectly owned by Aon Corporation. In the first quarter of 2019, Aon Corporation obtained indirect ownership of subsidiaries that were previously indirectly owned by Aon plc. The financial results of these subsidiaries are included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has retrospectively reflected the impact of these transactions on the Condensed Consolidating Statements of Income and Condensed Consolidating Statements of Comprehensive Income for the periods ended September 30, 2018 and the Condensed Consolidated Statement of Financial Position as of December 31, 2018.

The following tables set forth Condensed Consolidating Statements of Income and Condensed Consolidating Statements of Comprehensive Income for the three and nine months ended September 30, 2019 and 2018, Condensed Consolidating Statements of Financial Position as of September 30, 2019 and December 31, 2018, and Condensed Consolidating Statements of Cash Flows for the nine months ended September 30, 2019 and 2018 in accordance with Rule 3-10 of Regulation S-X. The Condensed

27

Consolidating Financial Information includes the accounts of Aon plc, the accounts of Aon Corporation, and the combined accounts of the Other Non-Guarantor Subsidiaries. The Condensed Consolidating Financial Statements are presented in all periods as a merger under common control. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,379		$	—		$	2,379
Expenses
Compensation and benefits	12			2			1,354			—			1,368
Information technology	—			—			120			—			120
Premises	—			4			72			—			76
Depreciation of fixed assets	—			—			44			—			44
Amortization and impairment of intangible assets	—			—			101			—			101
Other general expense (income)	2			1			307			—			310
Total operating expenses	14			7			1,998			—			2,019
Operating income (loss)	(14		)	(7		)	381			—			360
Interest income	—			11			—			(10		)	1
Interest expense	(47		)	(35		)	(6		)	10			(78		)
Intercompany interest income (expense)	4			(116		)	112			—			—
Intercompany other income (expense)	(70		)	(9		)	79			—			—
Other income (expense)	39			(22		)	7			(22		)	2
Income (loss) from continuing operations before income taxes	(88		)	(178		)	573			(22		)	285
Income tax expense (benefit)	(2		)	(35		)	93			—			56
Net income (loss) from continuing operations	(86		)	(143		)	480			(22		)	229
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(86		)	(143		)	479			(22		)	228
Equity in earnings of subsidiaries	330			107			(36		)	(401		)	—
Net income (loss)	244			(36		)	443			(423		)	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	244		$	(36	)	$	437		$	(423	)	$	222

28

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,349		$	—		$	2,349
Expenses
Compensation and benefits	13			3			1,376			—			1,392
Information technology	—			—			125			—			125
Premises	—			—			94			—			94
Depreciation of fixed assets	—			—			40			—			40
Amortization and impairment of intangible assets	—			—			100			—			100
Other general expense (income)	—			(1		)	337			—			336
Total operating expenses	13			2			2,072			—			2,087
Operating income (loss)	(13		)	(2		)	277			—			262
Interest income	—			15			—			(15		)	—
Interest expense	(52		)	(26		)	(6		)	15			(69		)
Intercompany interest income (expense)	4			(128		)	124			—			—
Intercompany other income (expense)	245			(245		)	—			—			—
Other income (expense)	(5		)	(3		)	7			2			1
Income (loss) from continuing operations before income taxes	179			(389		)	402			2			194
Income tax expense (benefit)	(8		)	(67		)	114			—			39
Net income (loss) from continuing operations	187			(322		)	288			2			155
Net income (loss) from discontinued operations	—			—			(2		)	—			(2		)
Net income (loss) before equity in earnings of subsidiaries	187			(322		)	286			2			153
Equity in earnings of subsidiaries	(42		)	(42		)	(364		)	448			—
Net income (loss)	145			(364		)	(78		)	450			153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	145		$	(364	)	$	(84	)	$	450		$	147

29

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,128		$	—		$	8,128
Expenses
Compensation and benefits	54			14			4,385			—			4,453
Information technology	—			—			363			—			363
Premises	—			17			231			—			248
Depreciation of fixed assets	—			—			124			—			124
Amortization and impairment of intangible assets	—			—			295			—			295
Other general expense (income)	5			3			992			—			1,000
Total operating expenses	59			34			6,390			—			6,483
Operating income (loss)	(59		)	(34		)	1,738			—			1,645
Interest income	—			29			—			(25		)	4
Interest expense	(138		)	(97		)	(17		)	25			(227		)
Intercompany interest income (expense)	11			(348		)	337			—			—
Intercompany other income (expense)	98			(272		)	174			—			—
Other income (expense)	33			(47		)	39			(17		)	8
Income (loss) from continuing operations before income taxes	(55		)	(769		)	2,271			(17		)	1,430
Income tax expense (benefit)	(7		)	(141		)	386			—			238
Net income (loss) from continuing operations	(48		)	(628		)	1,885			(17		)	1,192
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(48		)	(628		)	1,884			(17		)	1,191
Equity in earnings of subsidiaries	1,223			1,132			504			(2,859		)	—
Net income (loss)	1,175			504			2,388			(2,876		)	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	$	1,175		$	504		$	2,355		$	(2,876	)	$	1,158

30

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,000		$	—		$	8,000
Expenses
Compensation and benefits	47			5			4,450			—			4,502
Information technology	—			—			363			—			363
Premises	—			—			283			—			283
Depreciation of fixed assets	—			—			126			—			126
Amortization and impairment of intangible assets	—			—			492			—			492
Other general expense (income)	3			90			1,096			—			1,189
Total operating expenses	50			95			6,810			—			6,955
Operating income (loss)	(50		)	(95		)	1,190			—			1,045
Interest income	—			44			—			(39		)	5
Interest expense	(149		)	(75		)	(23		)	39			(208		)
Intercompany interest income (expense)	11			(385		)	374			—			—
Intercompany other income (expense)	99			(240		)	141			—			—
Other income (expense)	18			(29		)	7			(13		)	(17		)
Income (loss) from continuing operations before income taxes	(71		)	(780		)	1,689			(13		)	825
Income tax expense (benefit)	(27		)	(144		)	180			—			9
Net income (loss) from continuing operations	(44		)	(636		)	1,509			(13		)	816
Net income (loss) from discontinued operations	—			—			5			—			5
Net income (loss) before equity in earnings of subsidiaries	(44		)	(636		)	1,514			(13		)	821
Equity in earnings of subsidiaries	846			870			234			(1,950		)	—
Net income (loss)	802			234			1,748			(1,963		)	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	$	802		$	234		$	1,716		$	(1,963	)	$	789

31

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	244		$	(36	)	$	443		$	(423	)	$	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	244			(36		)	437			(423		)	222
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			—			(2		)	—			(2		)
Foreign currency translation adjustments	—			—			(234		)	22			(212		)
Postretirement benefit obligation	—			10			7			—			17
Total other comprehensive income (loss)	—			10			(229		)	22			(197		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(215		)	(220		)	(210		)	645			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(4		)	—			(4		)
Total other comprehensive income (loss) attributable to Aon shareholders	(215		)	(210		)	(435		)	667			(193		)
Comprehensive income (loss) attributable to Aon shareholders	$	29		$	(246	)	$	2		$	244		$	29

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	145		$	(364	)	$	(78	)	$	450		$	153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	145			(364		)	(84		)	450			147
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(2		)	3			—			1
Foreign currency translation adjustments	—			—			(48		)	(2		)	(50		)
Postretirement benefit obligation	—			12			(74		)	—			(62		)
Total other comprehensive income (loss)	—			10			(119		)	(2		)	(111		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(106		)	(134		)	(124		)	364			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(3		)	—			(3		)
Total other comprehensive income (loss) attributable to Aon shareholders	(106		)	(124		)	(240		)	362			(108		)
Comprehensive income (loss) attributable to Aon shareholders	$	39		$	(488	)	$	(324	)	$	812		$	39

32

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	1,175		$	504		$	2,388		$	(2,876	)	$	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	1,175			504			2,355			(2,876		)	1,158
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			2			(5		)	—			(3		)
Foreign currency translation adjustments	—			—			(199		)	17			(182		)
Postretirement benefit obligation	—			42			20			—			62
Total other comprehensive income (loss)	—			44			(184		)	17			(123		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(138		)	(223		)	(179		)	540			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(2		)	—			(2		)
Total other comprehensive income (loss) attributable to Aon shareholders	(138		)	(179		)	(361		)	557			(121		)
Comprehensive income (loss) attributable to Aon shareholders	$	1,037		$	325		$	1,994		$	(2,319	)	$	1,037

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	802		$	234		$	1,748		$	(1,963	)	$	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	802			234			1,716			(1,963		)	789
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(3		)	17			—			14
Foreign currency translation adjustments	—			—			(276		)	13			(263		)
Postretirement benefit obligation	—			34			74			—			108
Total other comprehensive income (loss)	—			31			(185		)	13			(141		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(148		)	(194		)	(163		)	505			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(6		)	—			(6		)
Total other comprehensive income (loss) attributable to Aon shareholders	(148		)	(163		)	(342		)	518			(135		)
Comprehensive income (loss) attributable to Aon shareholders	$	654		$	71		$	1,374		$	(1,445	)	$	654

33

Condensed Consolidating Statement of Financial Position

	As of September 30, 2019
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	1,530		$	491		$	(1,419	)	$	602
Short-term investments	—		63			114			—			177
Receivables, net	—		—			2,866			—			2,866
Fiduciary assets	—		—			11,041			—			11,041
Current intercompany receivables	153		4,090			13,669			(17,912		)	—
Other current assets	—		6			625			—			631
Total current assets	153		5,689			28,806			(19,331		)	15,317
Goodwill	—		—			8,071			—			8,071
Intangible assets, net	—		—			874			—			874
Fixed assets, net	—		—			606			—			606
Operating lease right-of-use assets	—		109			804			—			913
Deferred tax assets	93		513			150			(145		)	611
Prepaid pension	—		5			1,208			—			1,213
Non-current intercompany receivables	394		261			7,198			(7,853		)	—
Other non-current assets	2		35			525			—			562
Investment in subsidiary	9,052		20,085			(725		)	(28,412		)	—
Total assets	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	1,171	$	42		$	1,705		$	(1,419	)	$	1,499
Short-term debt and current portion of long-term debt	546		599			3			—			1,148
Fiduciary liabilities	—		—			11,041			—			11,041
Current intercompany payables	268		15,956			1,688			(17,912		)	—
Other current liabilities	—		79			1,084			—			1,163
Total current liabilities	1,985		16,676			15,521			(19,331		)	14,851
Long-term debt	4,213		1,907			—			—			6,120
Non-current operating lease liabilities	—		146			776			—			922
Deferred tax liabilities	1		—			353			(145		)	209
Pension, other postretirement, and postemployment liabilities	—		1,222			329			—			1,551
Non-current intercompany payables	—		7,364			489			(7,853		)	—
Other non-current liabilities	3		107			843			—			953
Total liabilities	6,202		27,422			18,311			(27,329		)	24,606
Equity
Total Aon shareholders’ equity	3,492		(725		)	29,137			(28,412		)	3,492
Noncontrolling interests	—		—			69			—			69
Total equity	3,492		(725		)	29,206			(28,412		)	3,561
Total liabilities and equity	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167

34

Condensed Consolidating Statement of Financial Position

	As of December 31, 2018
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	862		$	575		$	(781	)	$	656
Short-term investments	—		56			116			—			172
Receivables, net	—		—			2,760			—			2,760
Fiduciary assets	—		—			10,166			—			10,166
Current intercompany receivables	191		897			11,634			(12,722		)	—
Other current assets	—		16			602			—			618
Total current assets	191		1,831			25,853			(13,503		)	14,372
Goodwill	—		—			8,171			—			8,171
Intangible assets, net	—		—			1,149			—			1,149
Fixed assets, net	—		—			588			—			588
Operating lease right-of-use assets	—		—			—			—			—
Deferred tax assets	94		467			144			(144		)	561
Prepaid pension	—		5			1,128			—			1,133
Non-current intercompany receivables	403		261			7,225			(7,889		)	—
Other non-current assets	1		30			417			—			448
Investment in subsidiary	8,433		19,132			(882		)	(26,683		)	—
Total assets	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	274	$	70		$	2,380		$	(781	)	$	1,943
Short-term debt and current portion of long-term debt	250		—			1			—			251
Fiduciary liabilities	—		—			10,166			—			10,166
Current intercompany payables	213		11,875			634			(12,722		)	—
Other current liabilities	—		69			867			—			936
Total current liabilities	737		12,014			14,048			(13,503		)	13,296
Long-term debt	4,231		1,762			—			—			5,993
Non-current operating lease liabilities	—		—			—			—			—
Deferred tax liabilities	—		—			325			(144		)	181
Pension, other postretirement, and postemployment liabilities	—		1,275			361			—			1,636
Non-current intercompany payables	—		7,390			499			(7,889		)	—
Other non-current liabilities	3		167			927			—			1,097
Total liabilities	4,971		22,608			16,160			(21,536		)	22,203
Equity
Total Aon shareholders’ equity	4,151		(882		)	27,565			(26,683		)	4,151
Noncontrolling interests	—		—			68			—			68
Total equity	4,151		(882		)	27,633			(26,683		)	4,219
Total liabilities and equity	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422

35

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	356		$	(118	)	$	1,578		$	(653	)	$	1,163
Cash flows from investing activities
Proceeds from investments				17			16						33
Payments for investments	—			(46		)	(49		)	1			(94		)
Net sales (purchases) of short-term investments - non-fiduciary	—			(7		)	—			—			(7		)
Acquisition of businesses, net of cash acquired	—			—			(39		)	—			(39		)
Sale of businesses, net of cash sold	—			—			43			—			43
Capital expenditures	—			—			(167		)	—			(167		)
Cash provided by (used for) investing activities	—			(36		)	(196		)	1			(231		)
Cash flows from financing activities
Share repurchase	(1,507		)	—			—			—			(1,507		)
Advances from (to) affiliates	1,277			79			(1,370		)	14			—
Issuance of shares for employee benefit plans	(133		)	—			—			—			(133		)
Issuance of debt	2,099			2,816			3						4,918
Repayment of debt	(1,785		)	(2,073		)	—			—			(3,858		)
Cash dividends to shareholders	(307		)	—			—			—			(307		)
Noncontrolling interests and other financing activities	—			—			(81		)	—			(81		)
Cash provided by (used for) financing activities	(356		)	822			(1,448		)	14			(968		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(18		)	—			(18		)
Net increase (decrease) in cash and cash equivalents	—			668			(84		)	(638		)	(54		)
Cash and cash equivalents at beginning of period	—			862			575			(781		)	656
Cash and cash equivalents at end of period	$	—		$	1,530		$	491		$	(1,419	)	$	602

36

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	(143	)	$	479		$	2,258		$	(1,619	)	$	975
Cash flows from investing activities
Proceeds from investments	—			16			14			—			30
Payments for investments	(12		)	(36		)	(29		)	12			(65		)
Net sales (purchases) of short-term investments - non-fiduciary	—			308			48			—			356
Acquisition of businesses, net of cash acquired	—			—			(50		)	—			(50		)
Sale of businesses, net of cash sold	—			—			(8		)	—			(8		)
Capital expenditures				—			(179		)	—			(179		)
Cash provided by (used for) investing activities	(12		)	288			(204		)	12			84
Cash flows from financing activities
Share repurchase	(1,272		)	—			—			—			(1,272		)
Advances from (to) affiliates	1,292			(1,564		)	(2,054		)	2,326			—
Issuance of shares for employee benefit plans	(139		)	—			—			—			(139		)
Issuance of debt	1,258			2,701			1			—			3,960
Repayment of debt	(700		)	(2,501		)	(297		)	—			(3,498		)
Cash dividends to shareholders	(285		)	—			—			—			(285		)
Noncontrolling interests and other financing activities	—			—			(21		)	—			(21		)
Cash provided by (used for) financing activities	154			(1,364		)	(2,371		)	2,326			(1,255		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(76		)	—			(76		)
Net increase (decrease) in cash and cash equivalents	(1		)	(597		)	(393		)	719			(272		)
Cash and cash equivalents at beginning of period	1			2,524			793			(2,562		)	756
Cash and cash equivalents at end of period	$	—		$	1,927		$	400		$	(1,843	)	$	484

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20. Lease Commitments

The Company leases office facilities, equipment, and automobiles under non-cancelable operating and finance leases. The Company’s lease obligations are primarily for the use of office space. The Company evaluates if a leasing arrangement exists upon inception of a contract. A contract contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. Identified property, plant, or equipment may include a physically distinct portion of a larger asset, or a portion of an asset that represents substantially all of the capacity of the asset but is not physically distinct. The Company assesses whether a contract implicitly contains the right to control the use of a tangible asset that is not already owned. In addition, the Company subleases certain real estate properties to third parties, which consist of operating leases.

The Company’s leases expire at various dates and may contain renewal and expansion options. The exercise of lease renewal and expansion options are at the Company’s sole discretion and are only included in the determination of the lease term if the Company is reasonably certain to exercise the option. The Company’s leases do not typically contain termination options. In addition, the Company’s lease agreements typically do not contain any material residual value guarantees or restrictive covenants.

ROU assets and lease liabilities are based on the present value of the minimum lease payments over the lease term. As stated in Note 2 “Accounting Principles and Practices”, the Company has elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration received in a contract as a single lease component.

A portion of the Company’s lease agreements include variable lease payments that are not recorded in the initial measurement of the lease liability and ROU asset balances. For real estate arrangements, base rental payments may be escalated according to annual changes in the Consumer Price Index (“CPI”) or other indices. The escalated rental payments based on the estimated CPI at the lease commencement date are included within minimum rental payments; however, changes in CPI are considered variable in nature and are recognized as variable lease costs in the period in which the obligation is incurred. Additionally, real estate lease agreements may include other variable payments related to operating expenses charged by the landlord based on actual expenditures. Information technology equipment agreements may include variable payments based on usage of the equipment.

The Company utilizes discount rates to determine the present value of the lease payments based on information available at the commencement date of the lease. The Company uses an incremental borrowing rate based on factors such as the lease term and the economic environment where the lease exists to determine the appropriate present value of future lease payments as the rate implicit in the lease is not always readily available. When determining the incremental borrowing rate, the Company considers the rate of interest it would pay on a secured borrowing in an amount equal to the lease payments for the underlying asset under similar terms.

Operating leases are included in Operating lease right-of-use assets, Other current liabilities, and Non-current operating lease liabilities on the Condensed Consolidated Statements of Financial Position. Finance leases are included in Other non-current assets, Other current liabilities, and Other non-current liabilities on the Condensed Consolidated Statements of Financial Position.

The classification of operating and finance lease asset and liability balances within the Condensed Consolidated Statements of Financial Position is as follows (in millions):

As of		September 30, 2019
Assets
Operating lease assets	Operating lease right-of-use assets	$	913
Finance lease assets	Other non-current assets	106
Total lease assets		$	1,019
Liabilities
Current lease liabilities
Operating	Other current liabilities	$	194
Finance	Other current liabilities	24
Non-current lease liabilities
Operating	Non-current operating lease liabilities	922
Finance	Other non-current liabilities	82
Total lease liabilities		$	1,222

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The components of lease costs are as follows (in millions):

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
Operating lease cost	$	43		$	176
Finance lease costs
Amortization of leased assets	7			20
Interest on lease liabilities	—			1
Variable lease cost	31			49
Short-term lease cost (1)	1			3
Sublease income	(8		)	(24		)
Net lease cost	$	74		$	225

(1) Short-term lease cost does not include expenses related to leases with a lease term of one month or less.

Weighted average remaining lease term and discount rate related to operating and finance leases are as follows:

As of	September 30, 2019
Weighted average remaining lease term (years)
Operating leases	8.0
Finance leases	4.6
Weighted average discount rate
Operating leases	3.3	%
Finance leases	2.0	%

Other cash and non-cash related activities are as follows (in millions):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	182
Financing cash flows from finance leases	$	11
Non-cash related activities
ROU assets obtained in exchange for new operating lease liabilities	$	95
ROU assets obtained in exchange for new finance lease liabilities	$	48

The Company has recorded non-cash changes in Operating lease ROU assets and Non-current operating lease liabilities through Other assets and liabilities in Cash flows from operations within the Condensed Consolidated Statements of Cash Flows. Non-cash operating ROU asset lease expense was $87 million and the change in Non-current operating lease liabilities was a decrease of $92 million for the nine months ended September 30, 2019.

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Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438

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Item 2.  Management’s Discussion and Analysis of Financial Condition and Results of Operations

EXECUTIVE SUMMARY OF THIRD QUARTER 2019 FINANCIAL RESULTS

Aon plc (“Aon”, the “Company”, “we”, or “our”) is a leading global professional services firm providing a broad range of risk, retirement, and health solutions underpinned by proprietary data and analytics. Management is leading a set of initiatives designed to strengthen Aon and unite the firm with one portfolio of capability enabled by proprietary data and analytics and one operating model to deliver additional insight, connectivity, and efficiency.

Financial Results

The following is a summary of our third quarter of 2019 financial results from continuing operations:

• For the third quarter of 2019, revenue increased $30 million, or 1%, to $2.4 billion compared to the prior year period due primarily to organic revenue growth of 5%, partially offset by a 2% unfavorable impact from translating prior year period results at current period foreign exchange rates (“foreign currency translation”) and a 2% unfavorable impact related to divestitures, net of acquisitions. For the nine months ended September 30, 2019, revenue increased $128 million, or 2%, to $8.1 billion compared to the prior year period due primarily to organic revenue growth of 6%, partially offset by a 3% unfavorable impact from foreign currency translation and a 1% unfavorable impact related to divestitures, net of acquisitions.

• Operating expenses for the third quarter of 2019 were $2.0 billion, a decrease of $68 million compared to the prior year period. The decrease was due primarily to a $44 million favorable impact from foreign currency translation, a $34 million decrease in restructuring charges, $32 million of incremental savings related to restructuring and other operational improvement initiatives, and a $27 million decrease in expenses related to divestitures, net of acquisitions, partially offset by a $25 million non-recurring legacy litigation benefit recorded in the prior year period and an increase in expense associated with 5% organic revenue growth. Operating expenses for the first nine months of 2019 were $6.5 billion, a decrease of $472 million compared to the prior year period primarily due to a $211 million favorable impact from foreign currency translation, a $170 million decrease from a non-cash impairment charge related to certain assets and liabilities that were classified as held for sale in the prior year period, $115 million of incremental savings related to restructuring and other operational improvement initiatives, a $85 million decrease in restructuring charges, a $78 million decrease in expense related to legacy litigation, and a $69 million decrease in expenses related to divestitures, net of acquisitions, partially offset by an increase in expense associated with 6% organic revenue growth.

• Operating margin increased to 15.1% in the third quarter of 2019 from 11.2% in the prior year period. The increase was driven by organic revenue growth of 5%, strong operational improvement, and savings related to restructuring and other operational improvement initiatives. Operating margin for the first nine months of 2019 increased to 20.2% from 13.1% in the prior year period. The increase was driven by organic revenue growth of 6%, strong operational improvement, savings related to restructuring and other operational improvement initiatives, and a decrease from a non-cash impairment charge related to certain assets and liabilities that were classified as held for sale in the prior year period.

• Due to the factors set forth above, net income from continuing operations increased $74 million, or 48%, to $229 million for the third quarter of 2019 compared to the prior year period. During the first nine months of 2019, net income from continuing operations increased $376 million, or 46%, to $1,192 million compared to the first nine months of 2018.

• Diluted earnings per share from continuing operations was $0.93 per share for the third quarter of 2019 compared to $0.61 per share for the prior year period. During the first nine months of 2019, diluted earnings per share from continuing operations was $4.79 per share compared to $3.17 per share for the prior year period.

• Cash flow provided by operating activities was $1,163 million for the first nine months of 2019, an increase of $188 million from the prior year period, primarily reflecting strong operational improvement. The current year period includes approximately $85 million of net cash payments in the first quarter related to legacy litigation. The prior year comparable period included an $80 million accelerated pension contribution.

We focus on four key non-GAAP metrics that we communicate to shareholders: organic revenue growth, adjusted operating margin, adjusted diluted earnings per share, and free cash flow. These non-GAAP metrics should be viewed in addition to, not instead of, our Financial Statements. The following is our measure of performance against these four metrics from continuing operations for the third quarter of 2019:

• Organic revenue growth, a non-GAAP measure defined under the caption “Review of Consolidated Results — Organic Revenue Growth,” was 5% for the third quarter of 2019. Organic revenue growth was 6% for the first nine months of 2019, an acceleration from 4% in the prior year period. Organic revenue growth in both periods was driven by growth across every major revenue line, with particular strength in Commercial Risk Solutions and Reinsurance Solutions.

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• Adjusted operating margin, a non-GAAP measure defined under the caption “Review of Consolidated Results — Adjusted Operating Margin,” was 22.0% for the third quarter of 2019 compared to 18.5% in the prior year period. For the first nine months of 2019, adjusted operating margin was 27.3% compared to 24.8% for the prior year period. The increase in adjusted operating margin in both periods primarily reflects strong organic revenue growth, operational improvement, and savings related to restructuring and other operational improvement initiatives.

• Adjusted diluted earnings per share from continuing operations, a non-GAAP measure defined under the caption “Review of Consolidated Results — Adjusted Diluted Earnings per Share,” was $1.45 per share for the third quarter of 2019 and $6.64 in the first nine months of 2019, compared to $1.31 and $6.01 per share for the respective prior year periods.

• Free cash flow, a non-GAAP measure defined under the caption “Review of Consolidated Results — Free Cash Flow,” increased in the first nine months of 2019 by $200 million, or 25%, from the prior year period, to $996 million, reflecting an increase in cash flow from operations and a $12 million decrease in capital expenditures.

REVIEW OF CONSOLIDATED RESULTS 

Summary of Results

Our consolidated results are as follow (in millions):

	Three Months Ended						Nine Months Ended
	September 30, 2019			September 30, 2018			September 30, 2019			September 30, 2018
Revenue
Total revenue	$	2,379		$	2,349		$	8,128		$	8,000
Expenses
Compensation and benefits	1,368			1,392			4,453			4,502
Information technology	120			125			363			363
Premises	76			94			248			283
Depreciation of fixed assets	44			40			124			126
Amortization and impairment of intangible assets	101			100			295			492
Other general expense	310			336			1,000			1,189
Total operating expenses	2,019			2,087			6,483			6,955
Operating income	360			262			1,645			1,045
Interest income	1			—			4			5
Interest expense	(78		)	(69		)	(227		)	(208		)
Other income (expense)	2			1			8			(17		)
Income from continuing operations before income taxes	285			194			1,430			825
Income tax expense	56			39			238			9
Net income from continuing operations	229			155			1,192			816
Net income (loss) from discontinued operations	(1		)	(2		)	(1		)	5
Net income	228			153			1,191			821
Less: Net income attributable to noncontrolling interests	6			6			33			32
Net income attributable to Aon shareholders	$	222		$	147		$	1,158		$	789
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	0.93		$	0.61		$	4.79		$	3.17
Discontinued operations	—			(0.01		)	—			0.02
Net income	$	0.93		$	0.60		$	4.79		$	3.19
Weighted average ordinary shares outstanding - diluted	239.1			245.6			$	241.9		247.7

Revenue

Total revenue increased by $30 million, or 1%, in the third quarter of 2019 compared to the third quarter of 2018. This increase reflects organic revenue growth of 5%, partially offset by a 2% unfavorable impact from foreign currency translation and a 2%

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unfavorable impact related to divestitures, net of acquisitions. For the first nine months of 2019, revenue increased by $128 million, or 2%, compared to the prior year period. This increase reflects organic revenue growth of 6%, partially offset by a 3% unfavorable impact from foreign currency translation and a 1% unfavorable impact related to divestitures, net of acquisitions.

Commercial Risk Solutions revenue increased $28 million, or 3%, to $1,057 million in the third quarter of 2019, compared to $1,029 million in the third quarter of 2018. Organic revenue growth was 7% in the third quarter of 2019, driven by strong growth across every major geography, including double-digit growth in the U.S., Canada, and Latin America, primarily driven by strong retention and management of the renewal book portfolio. On average globally, exposures and pricing were both modestly positive, resulting in a modestly positive market impact overall. For the first nine months of 2019, revenue decreased $37 million, or 1%, to $3,342 million, compared to $3,379 million in the first nine months of 2018. Organic revenue growth was 6% in the first nine months of 2019, reflecting strong growth across every major geography, highlighted by particular strength across the U.S., Canada, and Latin America, driven by strong retention and management of the renewal book portfolio.

Reinsurance Solutions revenue increased $12 million, or 4%, to $291 million in the third quarter of 2019, compared to $279 million in the third quarter of 2018. Organic revenue growth was 5% in the third quarter of 2019, driven by double-digit growth globally in facultative placements and strong net new business generation globally in treaty, partially offset by a modest decline in capital markets transactions. For the first nine months of 2019, revenue increased $98 million, or 7%, to $1,499 million, compared to $1,401 million in the first nine months of 2018. Organic revenue growth was 9% in the first nine months of 2019, driven by strong net new business generation globally in treaty, as well as strong growth globally in facultative placements. In addition, market impact was modestly positive on results in both the third quarter and the first nine months of 2019.

Retirement Solutions revenue decreased $17 million, or 3%, to $484 million in the third quarter of 2019, compared to $501 million in the third quarter of 2018. Organic revenue growth was 3% in the third quarter of 2019, driven by solid growth across every major business, with particular strength in core retirement driven by an increase in demand for retirement consulting in the U.S. and increased volume of actuarial services in the EMEA region. For the first nine months of 2019, revenue decreased $33 million, or 2%, to $1,323 million, compared to $1,356 million in the first nine months of 2018. Organic revenue growth was 2% in the first nine months of 2019, driven by solid growth in delegated investment management and in the Human Capital practice, partially offset by an unfavorable impact from certain businesses that were divested in the second quarter.

Health Solutions revenue increased $1 million, or 0%, to $279 million in the third quarter of 2019, compared to $278 million in the third quarter of 2018. Organic revenue growth was 2% in the third quarter of 2019, driven by solid growth globally in health and benefits brokerage, highlighted by particular strength internationally. Results in the quarter were partially offset by an unfavorable impact of certain non-recurring revenue in the health care exchange business that benefited the prior year quarter, as well as the unfavorable timing of certain revenue that shifted to the fourth quarter. For the first nine months of 2019, revenue increased $44 million, or 4%, to $1,082 million, compared to $1,038 million in the first nine months of 2018. Organic revenue growth was 5% in the first nine months of 2019, driven by solid growth globally in health and benefits brokerage, highlighted by particular strength internationally.

Data & Analytic Services revenue increased $8 million, or 3%, to $271 million in the third quarter of 2019 compared to $263 million in the third quarter of 2018. Organic revenue growth was 3% in the third quarter of 2019, driven by growth globally across our Affinity business, as well as solid growth in Aon Client Treaty. Results in the third quarter were unfavorably impacted by certain non-recurring revenue that benefited the prior year quarter. For the first nine months of 2019, revenue increased $59 million, or 7%, to $893 million, compared to $834 million in the first nine months of 2018. Organic revenue growth was 4% in the first nine months of 2019, driven by growth globally across our Affinity business, with particular strength across both business and consumer solutions in the U.S.

Compensation and Benefits

Compensation and benefits decreased $24 million, or 2%, in the third quarter of 2019 compared to the third quarter of 2018. This decrease was primarily driven by $55 million of incremental savings related to restructuring and other operational improvement initiatives, a $32 million favorable impact from foreign currency translation, and an $18 million decrease in expenses related to divestitures, net of acquisitions, partially offset by an increase in expense associated with 5% organic revenue growth. For the first nine months of 2019, compensation and benefits decreased $49 million, or 1%, compared to the first nine months of 2018. The decrease was primarily driven by a $154 million favorable impact from foreign currency translation, $122 million of incremental savings related to restructuring and other operational improvement initiatives, and a $38 million decrease in expenses related to divestitures, net of acquisitions, partially offset by a $27 million increase in restructuring charges and an increase in expense associated with 6% organic revenue growth.

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Information Technology

Information technology, which represents costs associated with supporting and maintaining our infrastructure, decreased $5 million, or 4%, in the third quarter of 2019 compared to the third quarter of 2018. This decrease was primarily driven by a reduction of costs as we continue to optimize our IT portfolio, including favorable contract renewals and productivity credits related to data center optimization. For the first nine months of 2019, Information technology was flat compared to the first nine months of 2018. This was primarily driven by an $8 million favorable impact from foreign currency translation and a $5 million decrease in expenses related to divestitures, net of acquisitions, offset by an $8 million decrease in savings related to restructuring and other operational improvement initiatives and an increase in investments supporting growth initiatives.

Premises

Premises, which represents the cost of occupying offices in various locations throughout the world, decreased $18 million, or 19%, in the third quarter of 2019 compared to the third quarter of 2018. This decrease was primarily driven by an $8 million decrease in restructuring charges and a reduction of costs as we continue to optimize our global real estate footprint. For the first nine months of 2019, Premises decreased $35 million, or 12%, compared to the first nine months of 2018. This decrease was primarily driven by $11 million of incremental savings related to restructuring and other operational improvement initiatives, a $10 million favorable impact from foreign currency translation, a $7 million decrease in restructuring charges and a reduction of costs as we continue to optimize our global real estate footprint.

Depreciation of Fixed Assets

Depreciation of fixed assets primarily relates to software, leasehold improvements, furniture, fixtures and equipment, computer equipment, buildings, and automobiles. Depreciation of fixed assets increased $4 million, or 10%, in the third quarter of 2019 compared to the third quarter of 2018. This increase was primarily driven by a $3 million increase in restructuring charges. For the first nine months of 2019, Depreciation of fixed assets decreased $2 million, or 2%, compared to the first nine months of 2018. This decrease was primarily driven by a $4 million decrease in restructuring charges.

Amortization and Impairment of Intangibles Assets

Amortization and impairment of intangible assets primarily relates to finite-lived tradenames and customer-related, contract-based, and technology assets. Amortization and impairment of intangibles increased $1 million, or 1%, in the third quarter of 2019 compared to the third quarter of 2018, and decreased $197 million, or 40%, for the first nine months of 2019 compared to the first nine months of 2018. Included in the nine months ended September 30, 2018 was a $176 million non-cash impairment charge related to certain assets and liabilities that were classified as held for sale.

Other General Expense

Other general expense in the third quarter of 2019 decreased $26 million, or 8%, compared to the third quarter of 2018 due primarily to a $22 million decrease in restructuring charges, a $6 million favorable impact from foreign currency translation, a $6 million decrease in expenses related to divestitures, net of acquisitions, and expense discipline, partially offset by a $25 million non-recurring legacy litigation benefit recorded in the prior year period and a $19 million decrease in savings related to restructuring and other operational improvement initiatives. For the first nine months of 2019, Other general expense decreased $189 million, or 16%, compared to the prior year period. This decrease was primarily driven by a $100 million decrease in restructuring charges, a $78 million decrease in expense related to legacy litigation, and a $31 million favorable impact from foreign currency translation, partially offset by an increase in expense associated with 6% organic revenue growth.

Interest Income

Interest income represents income earned on operating cash balances and other income-producing investments. It does not include interest earned on funds held on behalf of clients. During the third quarter of 2019, Interest income was $1 million, compared to none in the prior year period. For the first nine months of 2019, Interest income was $4 million, compared to $5 million in the prior year period.

Interest Expense

Interest expense, which represents the cost of our debt obligations, was $78 million for the third quarter of 2019, an increase of $9 million, or 13%, from the third quarter of 2018. For the first nine months of 2019, Interest expense was $227 million, an increase of $19 million, or 9%, from the prior year period. The increase in both periods was due to higher outstanding debt.

Other Income (Expense)

Total other income was $2 million for the third quarter of 2019, compared to other income of $1 million for the third quarter of 2018. Other income for the third quarter of 2019 primarily includes $17 million of gains due to the favorable impact of exchange

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rates on the remeasurement of assets and liabilities in non-functional currencies and $3 million of pension and other postretirement income, partially offset by $20 million of losses on financial instruments. Other income of $1 million in the third quarter of 2018 primarily includes $3 million of gains due to the favorable impact of exchange rates on the remeasurement of assets and liabilities in non-functional currencies and $1 million of equity earnings, partially offset by a $3 million loss on the sale of certain businesses. Other income was $8 million for the first nine months of 2019, compared to other expense of $17 million for the first nine months of 2018. Other income for the first nine months of 2019 primarily includes $17 million of gains due to the favorable impact of exchange rates on the remeasurement of assets and liabilities in non-functional currencies, $12 million of pension and other postretirement income, and an $8 million gain on sale of certain businesses, partially offset by $32 million of losses on financial instruments. Other expense for the first nine months of 2018 primarily includes $27 million of losses on financial instruments and $5 million of pension and other postretirement expense, partially offset by $16 million of gains due to the favorable impact of exchange rates on the remeasurement of assets and liabilities in non-functional currencies.

Income From Continuing Operations before Income Taxes

Due to the factors discussed above, income from continuing operations before income taxes for the third quarter of 2019 was $285 million, a 47% increase from income from continuing operations before income taxes of $194 million in the third quarter of 2018, and income from continuing operations before income taxes was $1,430 million for the first nine months of 2019, a 73% increase from $825 million from the first nine months of 2018.

Income Taxes From Continuing Operations

The effective tax rates on net income from continuing operations were 19.6% and 20.1% for the third quarter of 2019 and 2018, respectively. The effective tax rates on net income from continuing operations were 16.6% and 1.1% for the nine months ended September 30, 2019 and 2018, respectively.

For the three months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, and certain discrete items.

For the three months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income and certain discrete items including return to accrual adjustments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, as well as certain favorable discrete items, including the impact of share-based payments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income including restructuring charges, legacy litigation and the impairment charge related to certain assets and liabilities previously classified as held for sale. The tax rate was also impacted by certain discrete items including the net tax benefit associated with the sale of certain assets and liabilities previously classified as held for sale, the impact of share-based payments, and changes in the assertion for unremitted earnings.

Net Income from Discontinued Operations

Net loss from discontinued operations was $1 million in the three and nine months ended September 30, 2019 compared to net loss of $2 million and net income of $5 million in the respective prior year periods.

Net Income Attributable to Aon Shareholders

Net income attributable to Aon shareholders for the third quarter of 2019 increased to $222 million, or $0.93 per diluted share, from $147 million, or $0.60 per diluted share, in the prior year period. Net income attributable to Aon shareholders for the first nine months of 2019 increased to $1,158 million, or $4.79 per diluted share, from $789 million, or $3.19 per diluted share, in the prior year period.

Non-GAAP Metrics

In our discussion of consolidated results, we sometimes refer to certain non-GAAP supplemental information derived from consolidated financial information specifically related to organic revenue growth, adjusted operating margin, adjusted diluted earnings per share, free cash flow, and the impact of foreign exchange rate fluctuations on operating results. This non-GAAP supplemental information should be viewed in addition to, not instead of, our Financial Statements.

Organic Revenue Growth

We use supplemental information related to organic revenue growth to help us and our investors evaluate business growth from existing operations. Organic revenue growth is a non-GAAP measure that includes the impact of intercompany activity and

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excludes the impact of changes in foreign exchange rates, fiduciary investment income, acquisitions, divestitures, transfers between revenue lines, and gains or losses on derivatives accounted for as hedges. This supplemental information related to organic revenue growth represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Financial Statements. Industry peers provide similar supplemental information about their revenue performance, although they may not make identical adjustments. A reconciliation of this non-GAAP measure to the reported Total revenue is as follows (in millions, except percentages):

	Three Months Ended
	September 30, 2019			September 30, 2018			% Change		Less: Currency Impact (1)		Less: Fiduciary Investment Income (2)		Less: Acquisitions, Divestitures & Other		Organic Revenue Growth (3)
Revenue
Commercial Risk Solutions	$	1,057		$	1,029		3	%	(2	)%	—	%	(2	)%	7	%
Reinsurance Solutions	291			279			4		(1	)	1		(1	)	5
Retirement Solutions	484			501			(3	)	(2	)	—		(4	)	3
Health Solutions	279			278			—		(3	)	—		1		2
Data & Analytic Services	271			263			3		(2	)	—		2		3
Elimination	(3		)	(1		)	N/A		N/A		N/A		N/A		N/A
Total revenue	$	2,379		$	2,349		1	%	(2	)%	—	%	(2	)%	5	%

	Nine Months Ended
	September 30, 2019			September 30, 2018			% Change		Less: Currency Impact (1)		Less: Fiduciary Investment Income (2)		Less: Acquisitions, Divestitures & Other		Organic Revenue Growth (3)
Revenue
Commercial Risk Solutions	$	3,342		$	3,379		(1	)%	(3	)%	—	%	(4	)%	6	%
Reinsurance Solutions	1,499			1,401			7		(2	)	1		(1	)	9
Retirement Solutions	1,323			1,356			(2	)	(3	)	—		(1	)	2
Health Solutions	1,082			1,038			4		(4	)	—		3		5
Data & Analytic Services	893			834			7		(3	)	—		6		4
Elimination	(11		)	(8		)	N/A		N/A		N/A		N/A		N/A
Total revenue	$	8,128		$	8,000		2	%	(3	)%	—	%	(1	)%	6	%

(1) Currency impact is determined by translating prior period's revenue at this period's foreign exchange rates.

(2) Fiduciary investment income for the three months ended September 30, 2019 and 2018, respectively, was $21 million and $15 million. Fiduciary investment income for the nine months ended September 30, 2019 and 2018, respectively, was $58 million and $37 million.

(3) Organic revenue growth includes the impact of intercompany activity and excludes the impact of changes in foreign exchange rates, fiduciary investment income, acquisitions, divestitures, transfers between revenue lines, and gains or losses on derivatives accounted for as hedges.

Adjusted Operating Margin

We use adjusted operating margin as a non-GAAP measure of core operating performance of the Company.  Adjusted operating margin excludes the impact of certain items, as listed below, because management does not believe these expenses are the best indicators of our core operating performance. This supplemental information related to adjusted operating margin represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Financial Statements.

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A reconciliation of this non-GAAP measure to the reported operating margin is as follows (in millions, except percentages):

	Three Months Ended						Nine Months Ended
	September 30, 2019			September 30, 2018			September 30, 2019			September 30, 2018
Revenue from continuing operations	$	2,379		$	2,349		$	8,128		$	8,000
Operating income from continuing operations - as reported	$	360		$	262		$	1,645		$	1,045
Amortization and impairment of intangible assets(1)	101			100			295			492
Restructuring	63			97			281			366
Legacy Litigation	—			(25		)	—			78
Operating income from continuing operations - as adjusted	$	524		$	434		$	2,221		$	1,981
Operating margin from continuing operations - as reported	15.1		%	11.2		%	20.2		%	13.1		%
Operating margin from continuing operations - as adjusted	22.0		%	18.5		%	27.3		%	24.8		%

(1) Included in the nine months ended September 30, 2018 was a $176 million non-cash impairment charges taken on certain assets and liabilities held for sale.

Adjusted Diluted Earnings per Share

We use adjusted diluted earnings per share as a non-GAAP measure of our core operating performance. Adjusted diluted earnings per share excludes the items identified above, along with pension settlements and related income taxes, because management does not believe these expenses are representative of our core earnings. This supplemental information related to adjusted diluted earnings per share represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Financial Statements and Notes thereto.

A reconciliation of this non-GAAP measure to the reported Diluted earnings per share is as follows (in millions, except per share data and percentages): 

	Three Months Ended September 30, 2019
						Non-GAAP
	U.S. GAAP			Adjustments		Adjusted
Operating income from continuing operations	$	360		$	164	$	524
Interest income	1			—		1
Interest expense	(78		)	—		(78		)
Other income (expense)	2			—		2
Income from continuing operations before income taxes	285			164		449
Income tax expense (1)	56			40		96
Net income from continuing operations	229			124		353
Net income (loss) from discontinued operations (2)	(1		)	—		(1		)
Net income	228			124		352
Less: Net income attributable to noncontrolling interests	6			—		6
Net income attributable to Aon shareholders	$	222		$	124	$	346
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	0.93		$	0.52	$	1.45
Discontinued operations	—			—		—
Net income	$	0.93		$	0.52	$	1.45
Weighted average ordinary shares outstanding - diluted	239.1			—		239.1
Effective tax rates (2)
Continuing operations	19.6		%			21.4		%
Discontinued operations	26.0		%			26.0		%

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	Three Months Ended September 30, 2018
						Non-GAAP
	U.S. GAAP			Adjustments		Adjusted
Operating income from continuing operations	$	262		$	172	$	434
Interest income	—			—		—
Interest expense	(69		)	—		(69		)
Other income (expense) (3)	1			9		10
Income from continuing operations before income taxes	194			181		375
Income tax expense (1)	39			9		48
Net income from continuing operations	155			172		327
Net income (loss) from discontinued operations (2)	(2		)	—		(2		)
Net income	153			172		325
Less: Net income attributable to noncontrolling interests	6			—		6
Net income attributable to Aon shareholders	$	147		$	172	$	319
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	0.61		$	0.70	$	1.31
Discontinued operations	(0.01		)	—		(0.01		)
Net income	$	0.60		$	0.70	$	1.30
Weighted average ordinary shares outstanding - diluted	245.6			—		245.6
Effective tax rates (2)
Continuing operations	20.1		%			12.8		%
Discontinued operations	21.3		%			26.7		%

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	Nine Months Ended September 30, 2019
						Non-GAAP
	U.S. GAAP			Adjustments		Adjusted
Operating income from continuing operations	$	1,645		$	576	$	2,221
Interest income	4			—		4
Interest expense	(227		)	—		(227		)
Other income (expense)	8			—		8
Income from continuing operations before income taxes	1,430			576		2,006
Income tax expense (1)	238			127		365
Net income from continuing operations	1,192			449		1,641
Net income (loss) from discontinued operations (2)	(1		)	—		(1		)
Net income	1,191			449		1,640
Less: Net income attributable to noncontrolling interests	33			—		33
Net income attributable to Aon shareholders	$	1,158		$	449	$	1,607
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	4.79		$	1.85	$	6.64
Discontinued operations	—			—		—
Net income	$	4.79		$	1.85	$	6.64
Weighted average ordinary shares outstanding - diluted	241.9			—		241.9
Effective tax rates (2)
Continuing operations	16.6		%			18.2		%
Discontinued operations	50.4		%			50.4		%

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	Nine Months Ended September 30, 2018
							Non-GAAP
	U.S. GAAP			Adjustments			Adjusted
Operating income from continuing operations	$	1,045		$	936		$	1,981
Interest income	5			—			5
Interest expense	(208		)	—			(208		)
Other income (expense) (3)	(17		)	32			15
Income from continuing operations before income taxes	825			968			1,793
Income tax expense (1)	9			264			273
Net income from continuing operations	816			704			1,520
Net income (loss) from discontinued operations (2)	5			(9		)	(4		)
Net income	821			695			1,516
Less: Net income attributable to noncontrolling interests	32			—			32
Net income attributable to Aon shareholders	$	789		$	695		$	1,484
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	3.17		$	2.84		$	6.01
Discontinued operations	0.02			(0.04		)	(0.02		)
Net income	$	3.19		$	2.80		$	5.99
Weighted average ordinary shares outstanding - diluted	247.7			—			247.7
Effective tax rates (2)
Continuing operations	1.1		%				15.2		%
Discontinued operations	8.8		%				36.5		%

(1) Adjusted items are generally taxed at the estimated annual effective tax rate, except for the applicable tax impact associated with estimated restructuring plan expenses, legacy litigation, accelerated tradename amortization, impairment charges and non-cash pension settlement charges, which are adjusted at the related jurisdictional rate. In addition, tax expense excludes the tax impacts of the sale of the disposal group as well as enactment date impacts of the Tax Cuts and Jobs Act of 2017.

(2) Adjusted income from discontinued operations, net of tax, excludes the gain on sale of discontinued operations of $9 million for the nine months ended September 30, 2018. The effective tax rate was further adjusted for the applicable tax impact associated with the gain on sale, as applicable.

(3) Adjusted Other income (expense) excludes Pension settlement charges of $9 million and $32 million for three and nine months ended September 30, 2018, respectively.

Free Cash Flow

We use free cash flow, defined as cash flow provided by operations less capital expenditures, as a non-GAAP measure of our core operating performance and cash-generating capabilities of our business operations. This supplemental information related to free cash flow represents a measure not in accordance with U.S. GAAP and should be viewed in addition to, not instead of, our Financial Statements. The use of this non-GAAP measure does not imply or represent the residual cash flow for discretionary expenditures. A reconciliation of this non-GAAP measure to the reported cash provided by operating activities is as follows (in millions):

	Nine Months Ended
	September 30, 2019			September 30, 2018
Cash provided by operating activities	$	1,163		$	975
Capital expenditures used for operations	(167		)	(179		)
Free cash flow provided by operations	$	996		$	796

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Impact of Foreign Exchange Rate Fluctuations 

Because we conduct business in more than 100 countries, foreign exchange rate fluctuations may have a significant impact on our business. Foreign exchange rate movements may be significant and may distort true period-to-period comparisons of changes in revenue or pretax income. Therefore, to give financial statement users meaningful information about our operations, we have provided an illustration of the impact of foreign currency exchange rates on our financial results. The methodology used to calculate this impact isolates the impact of the change in currencies between periods by translating the prior year quarter’s revenue, expenses, and net income using the current quarter’s foreign exchange rates.

Translating prior year quarter results at current quarter foreign exchange rates, currency fluctuations had an unfavorable impact of $0.01 and an unfavorable impact of $0.16, respectively, on net income per diluted share during the three and nine months ended September 30, 2019. Currency fluctuations had an unfavorable impact of $0.03 and a favorable impact of $0.11, respectively, on net income per diluted share during the three and nine months ended September 30, 2018, when 2017 results were translated at 2018 rates.

Translating prior year quarter results at current quarter foreign exchange rates, currency fluctuations had an unfavorable impact of $0.02 and an unfavorable impact of $0.20, respectively on adjusted net income per diluted share during the three and nine months ended September 30, 2019. Currency fluctuations had a favorable impact of $0.05 and an unfavorable impact of $0.15, respectively, on adjusted net income per diluted share during the three and nine months ended September 30, 2018, when 2017 results were translated at 2018 rates. These translations are performed for comparative and illustrative purposes only and do not impact the accounting policies or practices for amounts included in the Financial Statements.

LIQUIDITY AND FINANCIAL CONDITION

Liquidity

Executive Summary

We believe that our balance sheet and strong cash flow provide us with adequate liquidity. Our primary sources of liquidity are cash flows provided by operations, available cash reserves, and debt capacity available under our credit facilities. Our primary uses of liquidity are operating expenses, restructuring activities, capital expenditures, acquisitions, share repurchases, pension obligations, and shareholder dividends. We believe that cash flows from operations, available credit facilities and the capital markets will be sufficient to meet our liquidity needs, including principal and interest payments on debt obligations, capital expenditures, pension contributions, and anticipated working capital requirements, for the foreseeable future.

Cash on our balance sheet includes funds available for general corporate purposes, as well as amounts restricted as to their use. Funds held on behalf of clients in a fiduciary capacity are segregated and shown together with uncollected insurance premiums in Fiduciary assets in the Condensed Consolidated Statements of Financial Position, with a corresponding amount in Fiduciary liabilities.

In our capacity as an insurance broker or agent, we collect premiums from insureds and, after deducting our commission, remit the premiums to the respective insurance underwriters. We also collect claims or refunds from underwriters on behalf of insureds, which are then returned to the insureds. Unremitted insurance premiums and claims are held by us in a fiduciary capacity. In addition, some of our outsourcing agreements require us to hold funds on behalf of clients to pay obligations on their behalf. The levels of fiduciary assets and liabilities can fluctuate significantly, depending on when we collect premiums, claims, and refunds, make payments to underwriters and insureds, and collect funds from clients and make payments on their behalf, and upon the impact of foreign currency movements. Fiduciary assets, because of their nature, are generally invested in very liquid securities with highly rated, credit-worthy financial institutions. In our Condensed Consolidated Statements of Financial Position, the amounts we report for Fiduciary assets and Fiduciary liabilities are equal and offsetting. Our Fiduciary assets included cash and short-term investments of $5.1 billion and $3.9 billion at September 30, 2019 and December 31, 2018, respectively, and fiduciary receivables of $6.0 billion and $6.3 billion at September 30, 2019 and December 31, 2018, respectively. While we earn investment income on the fiduciary assets held in cash and investments, the cash and investments cannot be used for general corporate purposes.

We maintain multicurrency cash pools with third-party banks in which various Aon entities participate. Individual Aon entities are permitted to overdraw on their individual accounts provided the overall global balance does not fall below zero. At September 30, 2019, non-U.S. cash balances of one or more entities were negative; however, the overall balance was positive.

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The following table summarizes our Fiduciary assets, non-fiduciary Cash and cash equivalents, and Short-term investments as of September 30, 2019 (in millions):

	Statement of Financial Position Classification
Asset Type	Cash and Cash Equivalents		Short-term Investments		Fiduciary Assets		Total
Certificates of deposit, bank deposits or time deposits	$	602	$	—	$	3,400	$	4,002
Money market funds	—		177		1,674		1,851
Cash and short-term investments	602		177		5,074		5,853
Fiduciary receivables	—		—		5,967		5,967
Total	$	602	$	177	$	11,041	$	11,820

Cash and cash equivalents decreased $54 million in 2019. A summary of our cash flows provided by and used for operations from operating, investing, and financing activities is as follows (in millions):

	Nine Months Ended
	September 30, 2019			September 30, 2018
Cash provided by operating activities	$	1,163		$	975
Cash provided by (used for) investing activities	$	(231	)	$	84
Cash used for financing activities	$	(968	)	$	(1,255	)
Effect of exchange rates changes on cash and cash equivalents	$	(18	)	$	(76	)

Operating Activities

Net cash provided by operating activities during the nine months ended September 30, 2019 increased $188 million, or 19%, from the prior year period to $1,163 million. This amount represents net income reported, as adjusted for gains or losses on sales of businesses, share-based compensation expense, depreciation expense, amortization and impairments, and other non-cash income and expenses, as well as changes in working capital that relate primarily to the timing of payments of accounts payable and accrued liabilities and collection of receivables.

Pension Contributions

Pension contributions were $108 million for the nine months ended September 30, 2019, as compared to $222 million for the nine months ended September 30, 2018. For the remainder of 2019, we expect to contribute approximately $37 million in cash to our pension plans, including contributions to non-U.S. pension plans, which are subject to changes in foreign exchange rates.

Restructuring Plan

In 2017, Aon initiated the Restructuring Plan in connection with the sale of the Divested Business. The Restructuring Plan is intended to streamline operations across the organization and deliver greater efficiency, insight, and connectivity. The Company expects these restructuring activities and related expenses to affect continuing operations through the fourth quarter of 2019. The Company also estimates there to be 5,400 to 5,600 total role eliminations associated with the Restructuring Plan. In the second quarter of 2019, Aon updated the Restructuring Plan for additional opportunities that were identified in the quarter, which are expected to result in an additional estimated charges of $125 million in 2019.

The Restructuring Plan is expected to result in cumulative charges of approximately $1,350 million through the end of the plan, consisting of approximately $550 million in employee workforce reduction, $125 million in technology rationalization costs, $80 million in lease consolidation costs, $50 million in non-cash asset impairments, and $545 million in other costs, including certain separation costs associated with the sale of the Divested Business.

From the inception of the Restructuring Plan through September 30, 2019, the Company has eliminated 5,353 positions and incurred total charges of $1,263 million for restructuring and related separation costs. These charges are included in Compensation and benefits, Information technology, Premises, Depreciation of fixed assets, and Other general expense in the accompanying Condensed Consolidated Statements of Income.

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The following summarizes restructuring and separation costs by type that have been incurred through September 30, 2019 and are estimated to be incurred through the end of the Restructuring Plan (in millions). Estimated costs by type have been revised based on updated assumptions:

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019		Inception to Date		Estimated Remaining Costs		Estimated Total Cost (1)
Workforce reduction	$	9	$	111	$	525	$	25	$	550
Technology rationalization (2)	14		29		109		16		125
Lease consolidation (2)	3		17		53		27		80
Asset impairments	5		7		46		4		50
Other costs associated with restructuring and separation (2) (3)	32		117		530		15		545
Total restructuring and related expenses	$	63	$	281	$	1,263	$	87	$	1,350

(1) Actual costs, when incurred, may vary due to changes in the assumptions built into the Restructuring Plan. Significant assumptions that may change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives. Estimated Total Costs includes $100 million of non-cash charges.

(2) Total contract termination costs incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs, respectively, associated with restructuring and separation were for the three months ended September 30, 2019, $9 million, $2 million, and $18 million; for the nine months ended September 30, 2019, were $12 million, $15 million, and $21 million; and since inception of the Restructuring Plan, were $18 million, $48 million, and $109 million. Total estimated contract termination costs expected to be incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs associated with restructuring and separation, are $20 million, $80 million, and $116 million, respectively.

(3) Other costs associated with the Restructuring Plan include those to separate the Divested Business, as well as moving costs, and consulting and legal fees. These costs are generally recognized when incurred.

As of September 30, 2019, the changes in our liabilities for the Restructuring Plan were as follows (in millions):

	Restructuring Plan
Balance as of December 31, 2018	$	201
Expensed	260
Cash payments	(322		)
Foreign currency translation	(1		)
Balance as of September 30, 2019	$	138

Investing Activities

Cash flow used for investing activities was $231 million during the nine months ended September 30, 2019, a decrease of $315 million compared to $84 million of cash flow provided by investing activities in the prior year period. Generally, the primary drivers of cash flow used for investing activities are acquisition of businesses, purchases of short-term investments, capital expenditures, and payments for investments. Generally, the primary drivers of cash flow provided by investing activities are sales of businesses, sales of short-term investments, and proceeds from investments. The gains and losses corresponding to cash flows provided by proceeds from investments and used for payments for investments are primarily recognized in Other income (expense) in the Condensed Consolidated Statements of Income.

Short-term Investments

Short-term investments increased $5 million as compared to December 31, 2018. As disclosed in Note 16 “Fair Value Measurements and Financial Instruments” of the Financial Statements contained in Part I, Item 1 of this report, the majority of our investments carried at fair value are money market funds. These money market funds are held throughout the world with various financial institutions. We are not aware of any market liquidity issues that would materially impact the fair value of these investments.

Acquisitions and Dispositions of Businesses

During the first nine months of 2019, the Company completed the acquisition of three business for a total consideration of $39 million, net of cash acquired, and six businesses were sold for a net cash outflow of $43 million.

During the first nine months of 2018, the Company completed the acquisition of five businesses for a total consideration of $50 million, net of cash acquired, and three businesses were sold for a net cash outflow of $8 million.

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Capital Expenditures

The Company’s additions to fixed assets, including capitalized software, which amounted to $167 million and $179 million for the nine months ended September 30, 2019 and 2018, respectively, primarily relate to computer equipment purchases, the refurbishing and modernizing of office facilities, and software development costs.

Financing Activities

Cash flow used for financing activities during the nine months ended September 30, 2019 was $968 million, a decrease of $287 million compared to prior year period. The primary drivers of cash flow used for financing activities are share repurchases, issuances of debt, net of repayments, dividends paid to shareholders, issuances of shares for employee benefit plans, transactions with noncontrolling interests, and other financing activities, such as collection of or payments for deferred consideration in connection with prior-year business acquisitions and divestitures.

Share Repurchase Program 

Aon has a share repurchase program authorized by the Company’s Board of Directors. The Repurchase Program was established in April 2012 with $5.0 billion in authorized repurchases, and was increased by $5.0 billion in authorized repurchases in each of November 2014 and February 2017 for a total of $15.0 billion in repurchase authorizations.

The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):

	Three Months Ended September 30				Nine Months Ended September 30
	2019 (1)		2018		2019 (1)		2018
Shares repurchased	1.8		2.1		8.2		8.8
Average price per share	$	190.83	$	145.71	$	183.26	$	142.15
Costs recorded to retained earnings
Total repurchase cost	$	350	$	300	$	1,500	$	1,250
Additional associated costs	—		1		7		6
Total costs recorded to retained earnings	$	350	$	301	$	1,507	$	1,256

(1) Included in the 1.8 million and 8.2 million shares repurchased during the three and nine months ended September 30, 2019, respectively, were 25 thousand shares that did not settle until October 2019. These shares were settled at an average price per share of $193.91 and total cost of $4.8 million.

At September 30, 2019, the remaining authorized amount for share repurchase under the Repurchase Program was $2.5 billion. Under the Repurchase Program, we have repurchased a total of 126.5 million shares for an aggregate cost of approximately $12.5 billion. For further information regarding share repurchases made during the third quarter of 2019, see Part II, Item 2 of this report.

Borrowings

Total debt at September 30, 2019 was $7.3 billion, an increase of $1.0 billion compared to December 31, 2018. Further, commercial paper activity during the nine months ended September 30, 2019 and 2018 is as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Total issuances (1)	$	1,959		$	1,407		$	4,771		$	3,958
Total repayments	$	(1,634	)	$	(1,469	)	(3,858		)	(3,201		)
Net issuances	$	325		$	(62	)	$	913		$	757

(1) The proceeds of the commercial paper issuances were used primarily for short-term working capital needs.

In September 2019, the Company’s $600 million 5.00% Senior Notes due September 2020 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statement of Financial Position as the date of maturity is in less than one year.

On May 2, 2019, Aon Corporation issued $750 million 3.75% Senior Notes due May 2029. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

On December 3, 2018, Aon Corporation issued $350 million 4.50% Senior Notes due December 2028. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

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On March 8, 2018, the Company’s CAD 375 million ($291 million at March 8, 2018 exchange rates) 4.76% Senior Note due March 2018 issued by a Canadian subsidiary of Aon Corporation matured and was repaid in full.

Other Liquidity Matters

Distributable Reserves

As a company incorporated in England and Wales, we are required under U.K. law to have available “distributable reserves” to make share repurchases or pay dividends to shareholders. Distributable reserves are created through the earnings of the U.K. parent company and, among other methods, through a reduction in share capital approved by the High Court of Justice in England. Distributable reserves are not linked to a U.S. GAAP reported amount (e.g., retained earnings). As of September 30, 2019 and December 31, 2018, we had distributable reserves in excess of $32.9 billion and $2.2 billion, respectively. On July 16, 2019, we completed a reduction in share capital to create additional distributable reserves of $31 billion to support the payment of possible future dividends or future share repurchases, if and to the extent declared by the directors in compliance with their duties under U.K. law. We believe that we will have sufficient distributable reserves for the foreseeable future.

Credit Facilities

We expect cash generated by operations for 2019 to be sufficient to service our debt and contractual obligations, finance capital expenditures, continue purchases of shares under the Repurchase Program, and continue to pay dividends to our shareholders.  Although cash from operations is expected to be sufficient to service these activities, we have the ability to access the commercial paper markets or borrow under our credit facilities to accommodate any timing differences in cash flows. Additionally, under current market conditions, we believe that we could access capital markets to obtain debt financing for longer-term funding, if needed.

As of September 30, 2019, we had two committed credit facilities outstanding: our $900 million multi-currency U.S. credit facility expiring in February 2022 and our $400 million multi-currency U.S. credit facility expiring in October 2022. On October 19, 2019, the Company extended the $400 million multi-currency U.S. credit facility expiring in October 2022 by one year, and it will now expire in October 2023.

Each of these facilities includes customary representations, warranties, and covenants, including financial covenants that require us to maintain specified ratios of adjusted consolidated EBITDA to consolidated interest expense and consolidated debt to consolidated adjusted EBITDA, tested quarterly. At September 30, 2019, we did not have borrowings under either facility, and we were in compliance with the financial covenants and all other covenants contained therein during the rolling twelve months ended September 30, 2019.

Shelf Registration Statement

On September 25, 2018, we filed a shelf registration statement with the SEC, registering the offer and sale from time to time of an indeterminate amount of, among other securities, debt securities, preference shares, Class A Ordinary Shares and convertible securities. Our ability to access the market as a source of liquidity is dependent on investor demand, market conditions, and other factors.

Rating Agency Ratings

The major rating agencies’ ratings of our debt at October 25, 2019 appear in the table below. 

	Ratings
	Senior Long-term Debt	Commercial Paper	Outlook
Standard & Poor’s	A-	A-2	Stable
Moody’s Investor Services	Baa2	P-2	Stable
Fitch, Inc.	BBB+	F-2	Stable

A downgrade in the credit ratings of our senior debt or commercial paper could increase our borrowing costs, reduce or eliminate our access to capital, reduce our financial flexibility, restrict our access to the commercial paper market altogether, or impact future pension contribution requirements.

Guarantees in Connection with the Sale of the Divested Business

In connection with the sale of the Divested Business, we guaranteed future operating lease commitments related to certain facilities assumed by the Buyer. We are obligated to perform under the guarantees if the Divested Business defaults on the leases at any time during the remainder of the lease agreements, which expire on various dates through 2025. As of September 30, 2019,

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the undiscounted maximum potential future payments under the lease guarantee were $74 million, with an estimated fair value of $14 million. No cash payments were made in connection to the lease commitments during the three and nine months ended September 30, 2019.

Additionally, we are subject to performance guarantee requirements under certain client arrangements that were assumed by the Buyer. Should the Divested Business fail to perform as required by the terms of the arrangements, we would be required to fulfill the remaining contract terms, which expire on various dates through 2023. As of September 30, 2019, the undiscounted maximum potential future payments under the performance guarantees were $160 million, with an estimated fair value of $1 million. No cash payments were made in connection to the performance guarantees during the three and nine months ended September 30, 2019.

Letters of Credit and Other Guarantees

We have entered into a number of arrangements whereby our performance on certain obligations is guaranteed by a third party through the issuance of a letter of credit. We had total LOCs outstanding of approximately $71 million at September 30, 2019, compared to $83 million at December 31, 2018. These LOCs cover the beneficiaries related to certain of our U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for our own workers compensation program. We also have obtained LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at our international subsidiaries.

We have certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. The maximum exposure with respect to such contractual contingent guarantees was approximately $83 million at September 30, 2019, compared to $103 million at December 31, 2018.

Off-Balance Sheet Arrangements

Apart from commitments, guarantees, and contingencies, as disclosed herein and Note 17 “Claims, Lawsuits, and Other Contingencies” to the Financial Statements contained in Part I, Item 1 of this report, the Company had no off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on the Company’s financial condition, results of operations, or liquidity. Our cash flows from operations, borrowing availability, and overall liquidity are subject to risks and uncertainties. See “Information Concerning Forward-Looking Statements” below.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

There have been no changes in our critical accounting policies, which include revenue recognition, pensions, goodwill and other intangible assets, contingencies, share-based payments, and income taxes, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2018 (our “2018 Annual Report on Form 10-K”) other than those described below.

Lease Consolidation Costs

Where we have provided notice of cancellation pursuant to a lease agreement, we remove the associated right-of-use asset and the related lease liability, including any additional termination penalties incurred that were not previously included within the liability. To the extent that the associated right-of-use assets and lease liabilities are removed, a corresponding loss is recorded.

For properties where we plan to permanently cease use of a space and have the intent and ability to sublease the property, we will test the right-of-use asset for impairment to determine if a loss has occurred. The test for impairment will adjust the book value of the asset based on the net present value of the future cash flows expected from a sublease agreement using current market quotes for similar properties. When we finalize definitive agreements with the sublessee, we may record an additional impairment to reflect actual outcomes.

For properties where we plan to permanently cease use of a space and have no intention of reoccupying or subleasing the property, the amortization related to the right-of-use asset will be accelerated and recognized on a straight-line basis from the date that we commit to a plan to abandon the space through the date we permanently exit the property.

Additionally, a loss will also be recognized for lease related costs that are not reflected within the lease liability, such as operating expenses, taxes, and insurance that we are obligated to pay to the landlord after we have permanently exited the property.

NEW ACCOUNTING PRONOUNCEMENTS

Note 2 “Accounting Principles and Practices” to the Financial Statements contained in Part I, Item 1 of this report contains a discussion of recently issued accounting pronouncements and their impact or future potential impact on our financial results, if determinable.

56

INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS 

This report and reports we will subsequently file or furnish and have previously filed or furnished with the SEC contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements represent management’s expectations or forecasts of future events. Forward-looking statements are typically identified by words such as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “project,” “intend,” “plan,” “probably,” “potential,” “looking forward,” “continue,” and other similar terms, and future or conditional tense verbs like “could,” “may,” “might,” “should,” “will,” and “would.” You can also identify forward-looking statements by the fact that they do not relate strictly to historical or current facts. For example, we may use forward-looking statements when addressing topics such as:  market and industry conditions, including competitive and pricing trends; changes in our business strategies and methods of generating revenue; the development and performance of our services and products; changes in the composition or level of our revenues; our cost structure and the outcome of cost-saving or restructuring initiatives; the outcome of contingencies; dividend policy; the expected impact of acquisitions and dispositions; pension obligations; cash flow and liquidity; expected effective tax rate; future actions by regulators; and the impact of changes in accounting rules. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors, which may be revised or supplemented in subsequent reports filed or furnished with the SEC, that could impact results include:

• general economic and political conditions in the countries in which we do business around the world, including the U.K.’s expected withdrawal from the European Union;

• changes in the competitive environment or damage to our reputation;

• fluctuations in exchange and interest rates that could influence revenues and expenses;

• changes in global equity and fixed income markets that could affect the return on invested assets;

• changes in the funding status of our various defined benefit pension plans and the impact of any increased pension funding resulting from those changes;

• the level of our debt limiting financial flexibility or increasing borrowing costs;

• rating agency actions that could affect our ability to borrow funds;

• volatility in our tax rate due to a variety of different factors including U.S. federal income tax reform;

• changes in estimates or assumptions on our financial statements;

• limits on our subsidiaries to make dividend and other payments to us;

• the impact of lawsuits and other contingent liabilities and loss contingencies arising from errors and omissions and other claims against us;

• the impact of, and potential challenges in complying with, legislation and regulation in the jurisdictions in which we operate, particularly given the global scope of our businesses and the possibility of conflicting regulatory requirements across jurisdictions in which we do business;

• the impact of any investigations brought by regulatory authorities in the U.S., U.K., and other countries;

• the impact of any inquiries relating to compliance with the U.S. Foreign Corrupt Practices Act and non-U.S. anti-corruption laws and with U.S. and non-U.S. trade sanctions regimes;

• failure to protect intellectual property rights or allegations that we infringe on the intellectual property rights of others;

• the effects of English law on our operating flexibility and the enforcement of judgments against us;

• the failure to retain and attract qualified personnel;

• international risks associated with our global operations;

• the effect of natural or man-made disasters;

• the potential of a system or network breach or disruption resulting in operational interruption or improper disclosure of personal data;

57

• our ability to develop and implement new technology;

• damage to our reputation among clients, markets or third parties;

• the actions taken by third parties that perform aspects of our business operations and client services;

• the extent to which we manage certain risks created in connection with the various services, including fiduciary and investment consulting and other advisory services, among others, that we currently provide, or will provide in the future, to clients;

• our ability to continue, and the costs and risks associated with, growing, developing and integrating companies that we acquire or new lines of business;

• changes in commercial property and casualty markets, commercial premium rates or methods of compensation;

• changes in the health care system or our relationships with insurance carriers;

• our ability to implement initiatives intended to yield cost savings and the ability to achieve those cost savings;

• our risks and uncertainties in connection with the sale of the Divested Business; and

• our ability to realize the expected benefits from our restructuring plan.

Any or all of our forward-looking statements may turn out to be inaccurate, and there are no guarantees about our performance. The factors identified above are not exhaustive. Aon and its subsidiaries operate in a dynamic business environment in which new risks may emerge frequently. Accordingly, readers should not place undue reliance on forward-looking statements, which speak only as of the dates on which they are made. We are under no obligation (and expressly disclaim any obligation) to update or alter any forward-looking statement that we may make from time to time, whether as a result of new information, future events or otherwise. Further information about factors that could materially affect Aon, including our results of operations and financial condition, is contained in Part III, Item 1A Risk Factors of this report and in the “Risk Factors” section in Part I, “Item 1A Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2018. These factors may be revised or supplemented in subsequent Quarterly Reports on Form 10-Q or Current Reports on Form 8-K.

Item 3.  Quantitative and Qualitative Disclosures about Market Risk 

We are exposed to potential fluctuations in earnings, cash flows and the fair value of certain of our assets and liabilities due to changes in interest rates and foreign exchange rates. To manage the risk from these exposures, we enter into a variety of derivative instruments. We do not enter into derivatives or financial instruments for trading or speculative purposes.

The following discussion describes our specific exposures and the strategies we use to manage these risks. There have been no changes in our critical accounting policies for financial instruments and derivatives as discussed in our 2018 Annual Report on Form 10-K.

Foreign Exchange Risk

We are subject to foreign exchange rate risk. Our primary exposures include exchange rates between the U.S. dollar and the euro, the British pound, the Canadian dollar, the Australian dollar, the Indian rupee, and the Japanese yen. We use over-the-counter options and forward contracts to reduce the impact of foreign currency risk to our financial statements.

Additionally, some of our non-U.S. brokerage subsidiaries receive revenue in currencies that differ from their functional currencies. Our U.K. subsidiaries earn a portion of their revenue in U.S. dollars, euro, and Japanese yen, but most of their expenses are incurred in British pounds. At September 30, 2019, we have hedged approximately 45% of our U.K. subsidiaries’ expected exposures to U.S. dollar, euro, and Japanese yen transactions for the years ending December 31, 2019 and 2020, respectively. We generally do not hedge exposures beyond three years.

We also use forward and option contracts to economically hedge foreign exchange risk associated with monetary balance sheet exposures, such as inter-company notes and short-term assets and liabilities that are denominated in a non-functional currency and are subject to remeasurement.

The translated value of revenues and expenses from our international brokerage operations are subject to fluctuations in foreign exchange rates. If we were to translate prior year results at current quarter exchange rates, diluted earnings per share would have an unfavorable $0.01 impact and an unfavorable $0.16 impact, respectively, during the three and nine months ended September 30, 2019. Further, adjusted diluted earnings per share, a non-GAAP measure as defined and reconciled under the caption “Review of Consolidated Results — Adjusted Diluted Earnings Per Share,” would have an unfavorable $0.02 impact and an unfavorable

58

$0.20 impact, respectively, during the three and nine months ended September 30, 2019 if we were to translate prior year results at current quarter exchange rates.

Interest Rate Risk

Our fiduciary investment income is affected by changes in international and domestic short-term interest rates. We monitor our net exposure to short-term interest rates and, as appropriate, hedge our exposure with various derivative financial instruments.  This activity primarily relates to brokerage funds held on behalf of clients in the U.S. and in continental Europe. A decrease in global short-term interest rates adversely affects our fiduciary investment income.

Item 4.   Controls and Procedures

Evaluation of disclosure controls and procedures.  We have conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as of the end of the period covered by this quarterly report of September 30, 2019.  Based on this evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective such that the information relating to Aon, including our consolidated subsidiaries, required to be disclosed in our SEC reports is recorded, processed, summarized and reported within the time periods specified in appropriate statute, SEC rules and forms, and is accumulated and communicated to Aon’s management, including our chief executive officer and chief financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in internal control over financial reporting. No changes in Aon’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) occurred during the quarter ended September 30, 2019 that have materially affected, or that are reasonably likely to materially affect, Aon’s internal control over financial reporting.

59

Part II Other Information

Item 1. Legal Proceedings

See Note 17 “Claims, Lawsuits, and Other Contingencies” to the Financial Statements contained in Part I, Item 1 of this report, which is incorporated by reference herein.

Item 1A. Risk Factors

The risk factors set forth in Part I, “Item 1A. Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2018 reflect certain risks associated with existing and potential lines of business and contain “forward-looking statements” as discussed in Part I, Item 2 of this report. Readers should consider them in addition to the other information contained in this report as our business, financial condition or results of operations could be adversely affected if any of these risks actually occur.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities.

The following information relates to the purchase of equity securities by Aon or any affiliated purchaser during each month within the third quarter of 2019:

Period	Total Number of Shares Purchased	Average Price Paid per Share (1)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (1)(2)
7/1/19 - 7/31/19	80,014	$	193.82	80,014	$	2,808,018,037
8/1/19 - 8/31/19	1,043,706	$	189.85	1,043,706	$	2,609,866,454
9/1/19 - 9/30/19	709,845	$	191.92	709,845	$	2,473,632,319
	1,833,565	$	190.83	1,833,565	$	2,473,632,319

(1) Does not include commissions or other costs paid to repurchase shares.

(2) The Repurchase Program was established in April 2012 with $5.0 billion in authorized repurchases, and was increased by $5.0 billion in authorized repurchases in each of November 2014 and February 2017 for a total of $15.0 billion in repurchase authorizations. Included in the 1.8 million shares repurchased during the three months ended September 30, 2019 were 25 thousand shares that did not settle until October 2019. These shares were settled at an average price per share of $193.91 and total cost of $4.8 million.

We did not make any unregistered sales of equity in the third quarter of 2019.

Item 3. Defaults Upon Senior Securities

Not Applicable.

Item 4. Mine Safety Disclosures

Not Applicable.

Item 5. Other Information

Not Applicable.

Item 6. Exhibits 

Exhibits — The exhibits filed with this report are listed on the attached Exhibit Index.

60

Signature

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Aon plc
	(Registrant)
October 25, 2019	By:	/s/ Michael Neller
	Michael Neller
	SENIOR VICE PRESIDENT AND
	GLOBAL CONTROLLER
	(Principal Accounting Officer and duly authorized officer of Registrant)

61

Exhibit Index

Exhibit Number	Description of Exhibit
31.1	Certification of CEO.
31.2	Certification of CFO.
32.1	Certification of CEO Pursuant to section 1350 of Title 18 of the United States Code.
32.2	Certification of CFO Pursuant to section 1350 of Title 18 of the United States Code.
101	Interactive Data Files. The following materials are filed electronically with this Quarterly Report on Form 10-Q:
	101.SCH XBRL Taxonomy Extension Schema Document
	101.CAL XBRL Taxonomy Calculation Linkbase Document
	101.DEF XBRL Taxonomy Definition Linkbase Document
	101.PRE XBRL Taxonomy Presentation Linkbase Document
	101.LAB XBRL Taxonomy Calculation Linkbase Document

62

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Gregory C. Case, the Chief Executive Officer of Aon plc, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aon plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 25, 2019	/s/ GREGORY C. CASE
		Gregory C. Case Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Christa Davies, the Chief Financial Officer of Aon plc, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Aon plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	October 25, 2019	/s/ CHRISTA DAVIES
		Christa Davies Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

I, Gregory C. Case, the Chief Executive Officer of Aon plc (the “Company”), certify that (i) the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2019 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ GREGORY C. CASE

Gregory C. Case

Chief Executive Officer

October 25, 2019

EX-32.2

Exhibit 32.2

Certification Pursuant to Section 1350 of Chapter 63

of Title 18 of the United States Code

I, Christa Davies, the Chief Financial Officer of Aon plc (the “Company”), certify that (i) the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2019 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ CHRISTA DAVIES

Christa Davies

Chief Financial Officer

October 25, 2019

XML

Discontinued Operations Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Expenses
Net income (loss) from discontinued operations	$ (1)	$ (2)	$ (1)	$ 5
Tempo Business | Discontinued Operations, Disposed of by Sale
Expenses
Total operating expenses	1	4	2	7
Loss from discontinued operations before income taxes	(1)	(4)	(2)	(7)
Income tax benefit	0	(2)	(1)	(3)
Net loss from discontinued operations excluding gain	(1)	(2)	(1)	(4)
Gain on sale of discontinued operations, net of tax	0	0	0	9
Net income (loss) from discontinued operations	$ (1)	$ (2)	$ (1)	$ 5

XML

Other Financial Data - Schedule of Other Non-current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Financial Data [Abstract]
Cost to obtain contracts with customers	$ 163	$ 156
Taxes receivable	100	100
Leases	106
Investments	52	54
Other	141	138
Total	$ 562	$ 448

XML

Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 3,913	$ 4,618	$ 4,219	$ 5,140
Other comprehensive income (loss) before reclassifications, net			(190)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			91
Tax expense			(22)
Amounts reclassified from accumulated other comprehensive income, net			69
Total other comprehensive loss attributable to Aon shareholders	(193)	(108)	(121)	(135)
Ending Balance	3,561	$ 4,328	3,561	$ 4,328
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(3,909)
Amounts reclassified from accumulated other comprehensive income
Ending Balance	(4,030)		(4,030)
Change in Fair Value of Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(15)
Other comprehensive income (loss) before reclassifications, net			(12)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			12
Tax expense			(3)
Amounts reclassified from accumulated other comprehensive income, net			9
Total other comprehensive loss attributable to Aon shareholders			(3)
Ending Balance	(18)		(18)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(1,319)
Other comprehensive income (loss) before reclassifications, net			(180)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			0
Tax expense			0
Amounts reclassified from accumulated other comprehensive income, net			0
Total other comprehensive loss attributable to Aon shareholders			(180)
Ending Balance	(1,499)		(1,499)
Postretirement Benefit Obligation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			(2,575)
Other comprehensive income (loss) before reclassifications, net			2
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income			79
Tax expense			(19)
Amounts reclassified from accumulated other comprehensive income, net			60
Total other comprehensive loss attributable to Aon shareholders			62
Ending Balance	$ (2,513)		$ (2,513)

XML

Derivatives and Hedging - Schedule of amounts of derivative gains (losses) recognized in the Consolidated Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Gain (loss) recognized in Accumulated other comprehensive loss	$ (6)		$ (14)
Gain (loss) recognized in Accumulated other comprehensive loss		$ (3)		$ (14)
Derivative gains (losses) reclassified from accumulated other comprehensive loss	(4)		(12)
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		(3)		(9)
Total revenue
Derivative [Line Items]
Derivative gains (losses) reclassified from accumulated other comprehensive loss	(4)		(11)
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		0		0
Compensation and benefits
Derivative [Line Items]
Derivative gains (losses) reclassified from accumulated other comprehensive loss	0		0
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		0		1
Other general expenses
Derivative [Line Items]
Derivative gains (losses) reclassified from accumulated other comprehensive loss	0		0
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		0		(2)
Interest expense
Derivative [Line Items]
Derivative gains (losses) reclassified from accumulated other comprehensive loss	0		(1)
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		0		(1)
Other income (expense)
Derivative [Line Items]
Derivative gains (losses) reclassified from accumulated other comprehensive loss	$ 0		$ 0
Derivative gain (loss) reclassified from accumulated OCI into income, effective portion, net		$ (3)		$ (7)

XML

Fair Value Measurements and Financial Instruments - Schedule of financial instruments where the carrying amounts and fair values differ (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Carrying Value
Fair value of financial instrument
Current portion of long-term debt	$ 599	$ 0
Long-term debt	6,120	5,993
Fair Value | Fair Value, Inputs, Level 2
Fair value of financial instrument
Current portion of long-term debt	617	0
Long-term debt	$ 6,915	$ 6,159

XML

Share-Based Compensation Plans - Share-based compensation expenses recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 72	$ 67	$ 252	$ 214
Restricted share units (“RSUs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	42	41	155	145
Performance share awards (“PSAs”)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	28	24	90	63
Employee share purchase plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 2	$ 2	$ 7	$ 6

XML

Derivatives and Hedging - Foreign Exchange Risk Management Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Cash Flow Hedging
Derivative [Line Items]
Foreign currency exposures, maximum average hedging period (less than)	2 years
Not Designated as Hedging Instrument
Derivative [Line Items]
Foreign currency exposures, maximum hedging period (up to)	1 year

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue
Total revenue	$ 2,379			$ 2,349			$ 8,128	$ 8,000
Expenses
Compensation and benefits	1,368			1,392			4,453	4,502
Information technology	120			125			363	363
Premises	76			94			248	283
Depreciation of fixed assets	44			40			124	126
Amortization and impairment of intangible assets	101			100			295	492
Other general expenses	310			336			1,000	1,189
Total operating expenses	2,019			2,087			6,483	6,955
Operating income (loss)	360			262			1,645	1,045
Interest income	1			0			4	5
Interest expense	(78)			(69)			(227)	(208)
Intercompany interest income (expense)	0			0			0	0
Intercompany other income (expense)	0			0			0	0
Other income (expense)	2			1			8	(17)
Income (loss) from continuing operations before income taxes	285			194			1,430	825
Income tax expense (benefit)	56			39			238	9
Net income from continuing operations	229			155			1,192	816
Net income (loss) from discontinued operations	(1)			(2)			(1)	5
Net income (loss) before equity in earnings of subsidiaries	228			153			1,191	821
Equity in earnings of subsidiaries	0			0			0	0
Net income	228	$ 287	$ 676	153	$ 58	$ 610	1,191	821
Less: Net income attributable to noncontrolling interests	6			6			33	32
Net income attributable to Aon shareholders	222			147			1,158	789
Aon plc
Revenue
Total revenue	0			0			0	0
Expenses
Compensation and benefits	12			13			54	47
Information technology	0			0			0	0
Premises	0			0			0	0
Depreciation of fixed assets	0			0			0	0
Amortization and impairment of intangible assets	0			0			0	0
Other general expenses	2			0			5	3
Total operating expenses	14			13			59	50
Operating income (loss)	(14)			(13)			(59)	(50)
Interest income	0			0			0	0
Interest expense	(47)			(52)			(138)	(149)
Intercompany interest income (expense)	4			4			11	11
Intercompany other income (expense)	(70)			245			98	99
Other income (expense)	39			(5)			33	18
Income (loss) from continuing operations before income taxes	(88)			179			(55)	(71)
Income tax expense (benefit)	(2)			(8)			(7)	(27)
Net income from continuing operations	(86)			187			(48)	(44)
Net income (loss) from discontinued operations	0			0			0	0
Net income (loss) before equity in earnings of subsidiaries	(86)			187			(48)	(44)
Equity in earnings of subsidiaries	330			(42)			1,223	846
Net income	244			145			1,175	802
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	244			145			1,175	802
Aon Corporation
Revenue
Total revenue	0			0			0	0
Expenses
Compensation and benefits	2			3			14	5
Information technology	0			0			0	0
Premises	4			0			17	0
Depreciation of fixed assets	0			0			0	0
Amortization and impairment of intangible assets	0			0			0	0
Other general expenses	1			(1)			3	90
Total operating expenses	7			2			34	95
Operating income (loss)	(7)			(2)			(34)	(95)
Interest income	11			15			29	44
Interest expense	(35)			(26)			(97)	(75)
Intercompany interest income (expense)	(116)			(128)			(348)	(385)
Intercompany other income (expense)	(9)			(245)			(272)	(240)
Other income (expense)	(22)			(3)			(47)	(29)
Income (loss) from continuing operations before income taxes	(178)			(389)			(769)	(780)
Income tax expense (benefit)	(35)			(67)			(141)	(144)
Net income from continuing operations	(143)			(322)			(628)	(636)
Net income (loss) from discontinued operations	0			0			0	0
Net income (loss) before equity in earnings of subsidiaries	(143)			(322)			(628)	(636)
Equity in earnings of subsidiaries	107			(42)			1,132	870
Net income	(36)			(364)			504	234
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	(36)			(364)			504	234
Other Non-Guarantor Subsidiaries
Revenue
Total revenue	2,379			2,349			8,128	8,000
Expenses
Compensation and benefits	1,354			1,376			4,385	4,450
Information technology	120			125			363	363
Premises	72			94			231	283
Depreciation of fixed assets	44			40			124	126
Amortization and impairment of intangible assets	101			100			295	492
Other general expenses	307			337			992	1,096
Total operating expenses	1,998			2,072			6,390	6,810
Operating income (loss)	381			277			1,738	1,190
Interest income	0			0			0	0
Interest expense	(6)			(6)			(17)	(23)
Intercompany interest income (expense)	112			124			337	374
Intercompany other income (expense)	79			0			174	141
Other income (expense)	7			7			39	7
Income (loss) from continuing operations before income taxes	573			402			2,271	1,689
Income tax expense (benefit)	93			114			386	180
Net income from continuing operations	480			288			1,885	1,509
Net income (loss) from discontinued operations	(1)			(2)			(1)	5
Net income (loss) before equity in earnings of subsidiaries	479			286			1,884	1,514
Equity in earnings of subsidiaries	(36)			(364)			504	234
Net income	443			(78)			2,388	1,748
Less: Net income attributable to noncontrolling interests	6			6			33	32
Net income attributable to Aon shareholders	437			(84)			2,355	1,716
Consolidation Adjustments
Revenue
Total revenue	0			0			0	0
Expenses
Compensation and benefits	0			0			0	0
Information technology	0			0			0	0
Premises	0			0			0	0
Depreciation of fixed assets	0			0			0	0
Amortization and impairment of intangible assets	0			0			0	0
Other general expenses	0			0			0	0
Total operating expenses	0			0			0	0
Operating income (loss)	0			0			0	0
Interest income	(10)			(15)			(25)	(39)
Interest expense	10			15			25	39
Intercompany interest income (expense)	0			0			0	0
Intercompany other income (expense)	0			0			0	0
Other income (expense)	(22)			2			(17)	(13)
Income (loss) from continuing operations before income taxes	(22)			2			(17)	(13)
Income tax expense (benefit)	0			0			0	0
Net income from continuing operations	(22)			2			(17)	(13)
Net income (loss) from discontinued operations	0			0			0	0
Net income (loss) before equity in earnings of subsidiaries	(22)			2			(17)	(13)
Equity in earnings of subsidiaries	(401)			448			(2,859)	(1,950)
Net income	(423)			450			(2,876)	(1,963)
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	$ (423)			$ 450			$ (2,876)	$ (1,963)

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Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rates on net income from continuing operations were 19.6% and 16.6% for the three and nine months ended September 30, 2019, respectively. The effective tax rates on net income from continuing operations were 20.1% and 1.1% for the three and nine months ended September 30, 2018, respectively.

For the three months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, and certain discrete items.

For the three months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income and certain discrete items including return to accrual adjustments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2019, the tax rate was primarily driven by the geographical distribution of income, including restructuring charges, as well as certain favorable discrete items, primarily the impact of shared-based payments and changes in the assertion for unremitted earnings.

For the nine months ended September 30, 2018, the tax rate was primarily driven by the geographical distribution of income including restructuring charges, legacy litigation, and the impairment charge related to certain assets and liabilities previously classified as held for sale. The tax rate was also impacted by certain discrete items including the net tax benefit associated with the sale of certain assets and liabilities previously classified as held for sale, the impact of share-based payments, and changes in the assertion for unremitted earnings.

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Condensed Consolidated Statement of Shareholders' Equity Unaudited (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends (in dollars per share)	$ 0.44	$ 0.44	$ 0.40	$ 0.40	$ 0.40	$ 0.36

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Restructuring

9 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

In 2017, Aon initiated a global restructuring plan (the “Restructuring Plan”) in connection with the sale of the Divested Business. The Restructuring Plan is intended to streamline operations across the organization and deliver greater efficiency, insight, and connectivity. The Company expects these restructuring activities and related expenses to affect continuing operations through the fourth quarter of 2019. The Company also estimates there to be 5,400 to 5,600 total role eliminations associated with the Restructuring Plan. In the second quarter of 2019, Aon updated the Restructuring Plan for additional opportunities that were identified in the quarter, which are expected to result in additional estimated charges of $125 million in 2019.

The Restructuring Plan is expected to result in cumulative charges of approximately $1,350 million through the end of the plan, consisting of approximately $550 million in workforce reduction, $125 million in technology rationalization costs, $80 million in lease consolidation costs, $50 million in non-cash asset impairments, and $545 million in other costs, including certain separation costs associated with the sale of the Divested Business.

From the inception of the Restructuring Plan through September 30, 2019, the Company has eliminated 5,353 positions and incurred total charges of $1,263 million for restructuring and related separation costs. These charges are included in Compensation and benefits, Information technology, Premises, Depreciation of fixed assets, and Other general expense in the accompanying Condensed Consolidated Statements of Income.

The following table summarizes restructuring and separation costs by type that have been incurred through September 30, 2019 and are estimated to be incurred through the end of the Restructuring Plan (in millions). Estimated costs by type have been revised based on updated assumptions:

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019		Inception to Date		Estimated Remaining Costs		Estimated Total Cost (1)
Workforce reduction	$	9	$	111	$	525	$	25	$	550
Technology rationalization (2)	14		29		109		16		125
Lease consolidation (2)	3		17		53		27		80
Asset impairments	5		7		46		4		50
Other costs associated with restructuring and separation (2) (3)	32		117		530		15		545
Total restructuring and related expenses	$	63	$	281	$	1,263	$	87	$	1,350

(1) Actual costs, when incurred, may vary due to changes in the assumptions built into the Restructuring Plan. Significant assumptions that may change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss

calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives. Estimated Total Cost includes $100 million of non-cash charges.

(2) Total contract termination costs incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs, respectively, associated with restructuring and separation for the three months ended September 30, 2019 were $9 million, $2 million, and $18 million; for the nine months ended September 30, 2019, were $12 million, $15 million, and $21 million; and since inception of the Restructuring Plan, were $18 million, $48 million, and $109 million. Total estimated contract termination costs expected to be incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs associated with restructuring and separation, are $20 million, $80 million, and $116 million, respectively.

(3) Other costs associated with the Restructuring Plan include those to separate the Divested Business, as well as moving costs, and consulting and legal fees. These costs are generally recognized when incurred.

The changes in the Company’s liabilities for the Restructuring Plan as of September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	201
Expensed	260
Cash payments	(322		)
Foreign currency translation	(1		)
Balance as of September 30, 2019	$	138

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Revenue from Contracts with Customers

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Revenue from Contracts with Customers

Disaggregation of Revenue

The following table summarizes revenue from contracts with customers by principal service line (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Commercial Risk Solutions	$	1,057		$	1,029		$	3,342		$	3,379
Reinsurance Solutions	291			279			1,499			1,401
Retirement Solutions	484			501			1,323			1,356
Health Solutions	279			278			1,082			1,038
Data & Analytic Services	271			263			893			834
Elimination	(3		)	(1		)	(11		)	(8		)
Total revenue	$	2,379		$	2,349		$	8,128		$	8,000

Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
United States	$	1,209	$	1,215	$	3,516	$	3,456
Americas other than United States	256		203		723		683
United Kingdom	358		264		1,210		1,161
Europe, Middle East, & Africa other than United Kingdom	283		399		1,793		1,871
Asia Pacific	273		268		886		829
Total revenue	$	2,379	$	2,349	$	8,128	$	8,000

Contract Costs

An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	216		$	216		$	329		$	298
Additions	326			332			1,008			1,043
Amortization	(299		)	(305		)	(1,095		)	(1,090		)
Impairment	—			—			—			—
Foreign currency translation and other	(4		)	5			(3		)	(3		)
Balance at end of period	$	239		$	248		$	239		$	248

An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	161		$	144		$	156		$	145
Additions	14			16			40			37
Amortization	(11		)	(9		)	(33		)	(30		)
Impairment	—			—			—			—
Foreign currency translation and other	(1		)	(1		)	—			(2		)
Balance at end of period	$	163		$	150		$	163		$	150

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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 228	$ 153	$ 1,191	$ 821
Less: Net income attributable to noncontrolling interests	6	6	33	32
Net income attributable to Aon shareholders	222	147	1,158	789
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	(2)	1	(3)	14
Foreign currency translation adjustments	(212)	(50)	(182)	(263)
Postretirement benefit obligation	17	(62)	62	108
Total other comprehensive loss	(197)	(111)	(123)	(141)
Less: Other comprehensive loss attributable to noncontrolling interests	(4)	(3)	(2)	(6)
Total other comprehensive loss attributable to Aon shareholders	(193)	(108)	(121)	(135)
Comprehensive income (loss) attributable to Aon shareholders	$ 29	$ 39	$ 1,037	$ 654

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Other Financial Data (Tables)

9 Months Ended

Sep. 30, 2019

Other Financial Data [Abstract]

Schedule of Other Income (Expense)

Other income (expense) consists of the following (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Foreign currency remeasurement	$	17		$	3		$	17		$	16
Disposal of businesses	1			(3		)	8			(4		)
Pension and other postretirement	3			—			12			(5		)
Equity earnings	1			1			3			3
Financial instruments	(20		)	—			(32		)	(27		)
Total	$	2		$	1		$	8		$	(17	)

Schedule of Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	65		$	62		$	64		$	59
Provision charged to Other general expense	7			9			19			21
Accounts written off, net of recoveries	(6		)	(8		)	(17		)	(17		)
Foreign currency translation and other	1			3			1			3
Balance at end of period	$	67		$	66		$	67		$	66

Schedule of Other Current Assets

The components of Other current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to fulfill contracts with customers (1)	$	239	$	329
Prepaid expenses	123		97
Taxes receivable	177		113
Other (2)	92		79
Total	$	631	$	618

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2)

December 31, 2018 includes $12 million previously classified as “Receivables from the Divested Business

Schedule of Other Non-current Assets

The components of Other non-current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to obtain contracts with customers (1)	$	163	$	156
Taxes receivable	100		100
Leases (2)	106		—
Investments	52		54
Other	141		138
Total	$	562	$	448

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2)

Refer to Note 20 “Lease Commitments” for further information.

Schedule of Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Deferred revenue (1)	$	256	$	251
Leases (2)	218		—
Taxes payable	152		83
Other	537		602
Total	$	1,163	$	936

(1) During the three and nine months ended September 30, 2019, $144 million and $385 million, respectively, was recognized in the Condensed Consolidated Statements of Income. During the three and nine months ended September 30, 2018, $133 million and $348 million, respectively, was recognized in the Condensed Consolidated Statements of Income.

(2) Refer to Note 20 “Lease Commitments” for further information.

Schedule of Other Non-current Liabilities

The components of Other non-current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Taxes payable (1)	$	578	$	585
Leases	82		169
Deferred revenue	59		65
Compensation and benefits	48		56
Other	186		222
Total	$	953	$	1,097

(1) Includes $218 million and $240 million for the non-current portion of the one-time mandatory transition tax on accumulated foreign earnings as of September 30, 2019 and December 31, 2018, respectively.

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in the Net Carrying Amount of Goodwill by Operating Segment

The changes in the net carrying amount of goodwill for the nine months ended September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	8,171
Goodwill related to current year acquisitions	33
Goodwill related to disposals	(10		)
Goodwill related to prior year acquisitions	2
Foreign currency translation and other	(125		)
Balance as of September 30, 2019	$	8,071

Schedule of Other Intangible Assets by Asset Class

Other intangible assets by asset class are as follows (in millions):

	September 30, 2019						December 31, 2018
	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
Customer related and contract based	$	2,229	$	1,531	$	698	$	2,240	$	1,444	$	796
Tradenames	1,025		899		126		1,027		740		287
Technology and other	375		325		50		391		325		66
Total	$	3,629	$	2,755	$	874	$	3,658	$	2,509	$	1,149

Schedule of Estimated Future Amortization Expense on Intangible Assets

The estimated future amortization for finite lived intangible assets as of September 30, 2019 is as follows (in millions):

Remainder of 2019	$	96
2020	220
2021	126
2022	86
2023	76
2024	59
Thereafter	211
Total	$	874

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Guarantee of Registered Securities

9 Months Ended

Sep. 30, 2019

Guarantee of Registered Securities [Abstract]

Guarantee of Registered Securities

Guarantee of Registered Securities

As described in Note 17 “Claims, Lawsuits, and Other Contingencies,” in connection with the Redomestication, Aon plc entered into various agreements pursuant to which it agreed to guarantee the obligations of Aon Corporation arising under issued and outstanding debt securities, including the 5.00% Notes due September 2020, the 8.205% Notes due January 2027, and the 6.25% Notes due September 2040 (collectively, the “Aon Corporation Notes”). Additionally, Aon plc has guaranteed the obligations of Aon Corporation arising under the 4.50% Senior Notes due 2028 and the 3.75% Senior Notes due 2029. Aon Corporation is a 100% indirectly owned subsidiary of Aon plc. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the Aon Corporation Notes.

In addition, Aon Corporation entered into an agreement pursuant to which it guaranteed the obligations of Aon plc arising under the 4.25% Notes due December 2042 exchanged for Aon Corporation’s outstanding 8.205% Notes due January 2027, and has also guaranteed the obligations of Aon plc arising under the 4.45% Notes due May 2043, the 4.00% Notes due November 2023, the 2.875% Notes due May 2026, the 3.50% Notes due June 2024, the 4.60% Notes due June 2044, the 4.75% Notes due May 2045, the 2.80% Notes due March 2021, and the 3.875% Notes due December 2025 (collectively, the “Aon plc Notes”). In each case, the guarantee of Aon Corporation is full and unconditional. There are no subsidiaries of Aon plc, other than Aon Corporation, that are guarantors of the Aon plc Notes. As a result of the existence of these guarantees, the Company has elected to present the financial information set forth in this footnote in accordance with Rule 3-10 of Regulation S-X.

In the fourth quarter of 2018, Aon plc obtained direct ownership in two subsidiaries that were previously indirectly owned by Aon Corporation. In the first quarter of 2019, Aon Corporation obtained indirect ownership of subsidiaries that were previously indirectly owned by Aon plc. The financial results of these subsidiaries are included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has retrospectively reflected the impact of these transactions on the Condensed Consolidating Statements of Income and Condensed Consolidating Statements of Comprehensive Income for the periods ended September 30, 2018 and the Condensed Consolidated Statement of Financial Position as of December 31, 2018.

The following tables set forth Condensed Consolidating Statements of Income and Condensed Consolidating Statements of Comprehensive Income for the three and nine months ended September 30, 2019 and 2018, Condensed Consolidating Statements of Financial Position as of September 30, 2019 and December 31, 2018, and Condensed Consolidating Statements of Cash Flows for the nine months ended September 30, 2019 and 2018 in accordance with Rule 3-10 of Regulation S-X. The Condensed

Consolidating Financial Information includes the accounts of Aon plc, the accounts of Aon Corporation, and the combined accounts of the Other Non-Guarantor Subsidiaries. The Condensed Consolidating Financial Statements are presented in all periods as a merger under common control. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,379		$	—		$	2,379
Expenses
Compensation and benefits	12			2			1,354			—			1,368
Information technology	—			—			120			—			120
Premises	—			4			72			—			76
Depreciation of fixed assets	—			—			44			—			44
Amortization and impairment of intangible assets	—			—			101			—			101
Other general expense (income)	2			1			307			—			310
Total operating expenses	14			7			1,998			—			2,019
Operating income (loss)	(14		)	(7		)	381			—			360
Interest income	—			11			—			(10		)	1
Interest expense	(47		)	(35		)	(6		)	10			(78		)
Intercompany interest income (expense)	4			(116		)	112			—			—
Intercompany other income (expense)	(70		)	(9		)	79			—			—
Other income (expense)	39			(22		)	7			(22		)	2
Income (loss) from continuing operations before income taxes	(88		)	(178		)	573			(22		)	285
Income tax expense (benefit)	(2		)	(35		)	93			—			56
Net income (loss) from continuing operations	(86		)	(143		)	480			(22		)	229
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(86		)	(143		)	479			(22		)	228
Equity in earnings of subsidiaries	330			107			(36		)	(401		)	—
Net income (loss)	244			(36		)	443			(423		)	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	244		$	(36	)	$	437		$	(423	)	$	222

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,349		$	—		$	2,349
Expenses
Compensation and benefits	13			3			1,376			—			1,392
Information technology	—			—			125			—			125
Premises	—			—			94			—			94
Depreciation of fixed assets	—			—			40			—			40
Amortization and impairment of intangible assets	—			—			100			—			100
Other general expense (income)	—			(1		)	337			—			336
Total operating expenses	13			2			2,072			—			2,087
Operating income (loss)	(13		)	(2		)	277			—			262
Interest income	—			15			—			(15		)	—
Interest expense	(52		)	(26		)	(6		)	15			(69		)
Intercompany interest income (expense)	4			(128		)	124			—			—
Intercompany other income (expense)	245			(245		)	—			—			—
Other income (expense)	(5		)	(3		)	7			2			1
Income (loss) from continuing operations before income taxes	179			(389		)	402			2			194
Income tax expense (benefit)	(8		)	(67		)	114			—			39
Net income (loss) from continuing operations	187			(322		)	288			2			155
Net income (loss) from discontinued operations	—			—			(2		)	—			(2		)
Net income (loss) before equity in earnings of subsidiaries	187			(322		)	286			2			153
Equity in earnings of subsidiaries	(42		)	(42		)	(364		)	448			—
Net income (loss)	145			(364		)	(78		)	450			153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	145		$	(364	)	$	(84	)	$	450		$	147

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,128		$	—		$	8,128
Expenses
Compensation and benefits	54			14			4,385			—			4,453
Information technology	—			—			363			—			363
Premises	—			17			231			—			248
Depreciation of fixed assets	—			—			124			—			124
Amortization and impairment of intangible assets	—			—			295			—			295
Other general expense (income)	5			3			992			—			1,000
Total operating expenses	59			34			6,390			—			6,483
Operating income (loss)	(59		)	(34		)	1,738			—			1,645
Interest income	—			29			—			(25		)	4
Interest expense	(138		)	(97		)	(17		)	25			(227		)
Intercompany interest income (expense)	11			(348		)	337			—			—
Intercompany other income (expense)	98			(272		)	174			—			—
Other income (expense)	33			(47		)	39			(17		)	8
Income (loss) from continuing operations before income taxes	(55		)	(769		)	2,271			(17		)	1,430
Income tax expense (benefit)	(7		)	(141		)	386			—			238
Net income (loss) from continuing operations	(48		)	(628		)	1,885			(17		)	1,192
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(48		)	(628		)	1,884			(17		)	1,191
Equity in earnings of subsidiaries	1,223			1,132			504			(2,859		)	—
Net income (loss)	1,175			504			2,388			(2,876		)	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	$	1,175		$	504		$	2,355		$	(2,876	)	$	1,158

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,000		$	—		$	8,000
Expenses
Compensation and benefits	47			5			4,450			—			4,502
Information technology	—			—			363			—			363
Premises	—			—			283			—			283
Depreciation of fixed assets	—			—			126			—			126
Amortization and impairment of intangible assets	—			—			492			—			492
Other general expense (income)	3			90			1,096			—			1,189
Total operating expenses	50			95			6,810			—			6,955
Operating income (loss)	(50		)	(95		)	1,190			—			1,045
Interest income	—			44			—			(39		)	5
Interest expense	(149		)	(75		)	(23		)	39			(208		)
Intercompany interest income (expense)	11			(385		)	374			—			—
Intercompany other income (expense)	99			(240		)	141			—			—
Other income (expense)	18			(29		)	7			(13		)	(17		)
Income (loss) from continuing operations before income taxes	(71		)	(780		)	1,689			(13		)	825
Income tax expense (benefit)	(27		)	(144		)	180			—			9
Net income (loss) from continuing operations	(44		)	(636		)	1,509			(13		)	816
Net income (loss) from discontinued operations	—			—			5			—			5
Net income (loss) before equity in earnings of subsidiaries	(44		)	(636		)	1,514			(13		)	821
Equity in earnings of subsidiaries	846			870			234			(1,950		)	—
Net income (loss)	802			234			1,748			(1,963		)	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	$	802		$	234		$	1,716		$	(1,963	)	$	789

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	244		$	(36	)	$	443		$	(423	)	$	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	244			(36		)	437			(423		)	222
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			—			(2		)	—			(2		)
Foreign currency translation adjustments	—			—			(234		)	22			(212		)
Postretirement benefit obligation	—			10			7			—			17
Total other comprehensive income (loss)	—			10			(229		)	22			(197		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(215		)	(220		)	(210		)	645			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(4		)	—			(4		)
Total other comprehensive income (loss) attributable to Aon shareholders	(215		)	(210		)	(435		)	667			(193		)
Comprehensive income (loss) attributable to Aon shareholders	$	29		$	(246	)	$	2		$	244		$	29

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	145		$	(364	)	$	(78	)	$	450		$	153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	145			(364		)	(84		)	450			147
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(2		)	3			—			1
Foreign currency translation adjustments	—			—			(48		)	(2		)	(50		)
Postretirement benefit obligation	—			12			(74		)	—			(62		)
Total other comprehensive income (loss)	—			10			(119		)	(2		)	(111		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(106		)	(134		)	(124		)	364			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(3		)	—			(3		)
Total other comprehensive income (loss) attributable to Aon shareholders	(106		)	(124		)	(240		)	362			(108		)
Comprehensive income (loss) attributable to Aon shareholders	$	39		$	(488	)	$	(324	)	$	812		$	39

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	1,175		$	504		$	2,388		$	(2,876	)	$	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	1,175			504			2,355			(2,876		)	1,158
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			2			(5		)	—			(3		)
Foreign currency translation adjustments	—			—			(199		)	17			(182		)
Postretirement benefit obligation	—			42			20			—			62
Total other comprehensive income (loss)	—			44			(184		)	17			(123		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(138		)	(223		)	(179		)	540			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(2		)	—			(2		)
Total other comprehensive income (loss) attributable to Aon shareholders	(138		)	(179		)	(361		)	557			(121		)
Comprehensive income (loss) attributable to Aon shareholders	$	1,037		$	325		$	1,994		$	(2,319	)	$	1,037

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	802		$	234		$	1,748		$	(1,963	)	$	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	802			234			1,716			(1,963		)	789
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(3		)	17			—			14
Foreign currency translation adjustments	—			—			(276		)	13			(263		)
Postretirement benefit obligation	—			34			74			—			108
Total other comprehensive income (loss)	—			31			(185		)	13			(141		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(148		)	(194		)	(163		)	505			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(6		)	—			(6		)
Total other comprehensive income (loss) attributable to Aon shareholders	(148		)	(163		)	(342		)	518			(135		)
Comprehensive income (loss) attributable to Aon shareholders	$	654		$	71		$	1,374		$	(1,445	)	$	654

Condensed Consolidating Statement of Financial Position

	As of September 30, 2019
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	1,530		$	491		$	(1,419	)	$	602
Short-term investments	—		63			114			—			177
Receivables, net	—		—			2,866			—			2,866
Fiduciary assets	—		—			11,041			—			11,041
Current intercompany receivables	153		4,090			13,669			(17,912		)	—
Other current assets	—		6			625			—			631
Total current assets	153		5,689			28,806			(19,331		)	15,317
Goodwill	—		—			8,071			—			8,071
Intangible assets, net	—		—			874			—			874
Fixed assets, net	—		—			606			—			606
Operating lease right-of-use assets	—		109			804			—			913
Deferred tax assets	93		513			150			(145		)	611
Prepaid pension	—		5			1,208			—			1,213
Non-current intercompany receivables	394		261			7,198			(7,853		)	—
Other non-current assets	2		35			525			—			562
Investment in subsidiary	9,052		20,085			(725		)	(28,412		)	—
Total assets	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	1,171	$	42		$	1,705		$	(1,419	)	$	1,499
Short-term debt and current portion of long-term debt	546		599			3			—			1,148
Fiduciary liabilities	—		—			11,041			—			11,041
Current intercompany payables	268		15,956			1,688			(17,912		)	—
Other current liabilities	—		79			1,084			—			1,163
Total current liabilities	1,985		16,676			15,521			(19,331		)	14,851
Long-term debt	4,213		1,907			—			—			6,120
Non-current operating lease liabilities	—		146			776			—			922
Deferred tax liabilities	1		—			353			(145		)	209
Pension, other postretirement, and postemployment liabilities	—		1,222			329			—			1,551
Non-current intercompany payables	—		7,364			489			(7,853		)	—
Other non-current liabilities	3		107			843			—			953
Total liabilities	6,202		27,422			18,311			(27,329		)	24,606
Equity
Total Aon shareholders’ equity	3,492		(725		)	29,137			(28,412		)	3,492
Noncontrolling interests	—		—			69			—			69
Total equity	3,492		(725		)	29,206			(28,412		)	3,561
Total liabilities and equity	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167

Condensed Consolidating Statement of Financial Position

	As of December 31, 2018
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	862		$	575		$	(781	)	$	656
Short-term investments	—		56			116			—			172
Receivables, net	—		—			2,760			—			2,760
Fiduciary assets	—		—			10,166			—			10,166
Current intercompany receivables	191		897			11,634			(12,722		)	—
Other current assets	—		16			602			—			618
Total current assets	191		1,831			25,853			(13,503		)	14,372
Goodwill	—		—			8,171			—			8,171
Intangible assets, net	—		—			1,149			—			1,149
Fixed assets, net	—		—			588			—			588
Operating lease right-of-use assets	—		—			—			—			—
Deferred tax assets	94		467			144			(144		)	561
Prepaid pension	—		5			1,128			—			1,133
Non-current intercompany receivables	403		261			7,225			(7,889		)	—
Other non-current assets	1		30			417			—			448
Investment in subsidiary	8,433		19,132			(882		)	(26,683		)	—
Total assets	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	274	$	70		$	2,380		$	(781	)	$	1,943
Short-term debt and current portion of long-term debt	250		—			1			—			251
Fiduciary liabilities	—		—			10,166			—			10,166
Current intercompany payables	213		11,875			634			(12,722		)	—
Other current liabilities	—		69			867			—			936
Total current liabilities	737		12,014			14,048			(13,503		)	13,296
Long-term debt	4,231		1,762			—			—			5,993
Non-current operating lease liabilities	—		—			—			—			—
Deferred tax liabilities	—		—			325			(144		)	181
Pension, other postretirement, and postemployment liabilities	—		1,275			361			—			1,636
Non-current intercompany payables	—		7,390			499			(7,889		)	—
Other non-current liabilities	3		167			927			—			1,097
Total liabilities	4,971		22,608			16,160			(21,536		)	22,203
Equity
Total Aon shareholders’ equity	4,151		(882		)	27,565			(26,683		)	4,151
Noncontrolling interests	—		—			68			—			68
Total equity	4,151		(882		)	27,633			(26,683		)	4,219
Total liabilities and equity	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	356		$	(118	)	$	1,578		$	(653	)	$	1,163
Cash flows from investing activities
Proceeds from investments				17			16						33
Payments for investments	—			(46		)	(49		)	1			(94		)
Net sales (purchases) of short-term investments - non-fiduciary	—			(7		)	—			—			(7		)
Acquisition of businesses, net of cash acquired	—			—			(39		)	—			(39		)
Sale of businesses, net of cash sold	—			—			43			—			43
Capital expenditures	—			—			(167		)	—			(167		)
Cash provided by (used for) investing activities	—			(36		)	(196		)	1			(231		)
Cash flows from financing activities
Share repurchase	(1,507		)	—			—			—			(1,507		)
Advances from (to) affiliates	1,277			79			(1,370		)	14			—
Issuance of shares for employee benefit plans	(133		)	—			—			—			(133		)
Issuance of debt	2,099			2,816			3						4,918
Repayment of debt	(1,785		)	(2,073		)	—			—			(3,858		)
Cash dividends to shareholders	(307		)	—			—			—			(307		)
Noncontrolling interests and other financing activities	—			—			(81		)	—			(81		)
Cash provided by (used for) financing activities	(356		)	822			(1,448		)	14			(968		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(18		)	—			(18		)
Net increase (decrease) in cash and cash equivalents	—			668			(84		)	(638		)	(54		)
Cash and cash equivalents at beginning of period	—			862			575			(781		)	656
Cash and cash equivalents at end of period	$	—		$	1,530		$	491		$	(1,419	)	$	602

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	(143	)	$	479		$	2,258		$	(1,619	)	$	975
Cash flows from investing activities
Proceeds from investments	—			16			14			—			30
Payments for investments	(12		)	(36		)	(29		)	12			(65		)
Net sales (purchases) of short-term investments - non-fiduciary	—			308			48			—			356
Acquisition of businesses, net of cash acquired	—			—			(50		)	—			(50		)
Sale of businesses, net of cash sold	—			—			(8		)	—			(8		)
Capital expenditures				—			(179		)	—			(179		)
Cash provided by (used for) investing activities	(12		)	288			(204		)	12			84
Cash flows from financing activities
Share repurchase	(1,272		)	—			—			—			(1,272		)
Advances from (to) affiliates	1,292			(1,564		)	(2,054		)	2,326			—
Issuance of shares for employee benefit plans	(139		)	—			—			—			(139		)
Issuance of debt	1,258			2,701			1			—			3,960
Repayment of debt	(700		)	(2,501		)	(297		)	—			(3,498		)
Cash dividends to shareholders	(285		)	—			—			—			(285		)
Noncontrolling interests and other financing activities	—			—			(21		)	—			(21		)
Cash provided by (used for) financing activities	154			(1,364		)	(2,371		)	2,326			(1,255		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(76		)	—			(76		)
Net increase (decrease) in cash and cash equivalents	(1		)	(597		)	(393		)	719			(272		)
Cash and cash equivalents at beginning of period	1			2,524			793			(2,562		)	756
Cash and cash equivalents at end of period	$	—		$	1,927		$	400		$	(1,843	)	$	484

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Derivatives and Hedging

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging

Derivatives and Hedging

The Company is exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, the Company enters into various derivative instruments that reduce these risks by creating offsetting exposures. The Company does not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it earns revenues, pays expenses, enters into monetary intercompany transfers, or other transactions denominated in a currency that differs from its functional currency. The Company uses foreign exchange derivatives, typically forward contracts, options and cross currency swaps, to reduce its overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than 2 years. These derivatives are accounted for as hedges, and changes in fair value are recorded each period in Other comprehensive income (loss) in the Condensed Consolidated Statements of Comprehensive Income.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to economically hedge the currency exposure of the Company’s global liquidity profile, including monetary assets or liabilities that are denominated in a non-functional currency of an entity, typically on a rolling 30-day basis, but may be for up to 1 year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income (expense) in the Condensed Consolidated Statements of Income.

The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Net Amount of Derivative Assets  Presented in the Statements of Financial Position (1)				Net Amount of Derivative Liabilities  Presented in the Statements of Financial Position (2)
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Foreign exchange contracts
Accounted for as hedges	$	607	$	646	$	10	$	17	$	1	$	2
Not accounted for as hedges (3)	313		269		—		1		1		6
Total	$	920	$	915	$	10	$	18	$	2	$	8

(1) Included within Other current assets ($3 million at September 30, 2019 and $3 million at December 31, 2018) or Other non-current assets ($7 million at September 30, 2019 and $15 million at December 31, 2018).

(2) Included within Other current liabilities ($2 million at September 30, 2019 and $5 million at December 31, 2018) or Other non-current liabilities ($3 million at December 31, 2018).

(3) These contracts typically are for 30 day durations and executed close to the last day of the most recent reporting month, thereby resulting in nominal fair values at the balance sheet date.

The amounts of derivative gains (losses) recognized in the Financial Statements are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Loss recognized in Accumulated other comprehensive loss	$	(6	)	$	(3	)	$	(14	)	$	(14	)

The amounts of derivative gains (losses) reclassified from Accumulated other comprehensive loss into the Condensed Consolidated Statements of Income are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Total revenue (1)	$	(4	)	$	—		$	(11	)	$	—
Compensation and benefits	—			—			—			1
Other general expense	—			—			—			(2		)
Interest expense	—			—			(1		)	(1		)
Other income (expense) (1)	—			(3		)	—			(7		)
Total	$	(4	)	$	(3	)	$	(12	)	$	(9	)

(1) With the adoption of new hedge accounting guidance in the first quarter of 2019, gains (losses) on derivatives accounted for as hedges are recognized in Total revenue in the Company’s Condensed Consolidated Statements of Income rather than Other income (expense). Refer to Note 2 “Accounting Principles and Practices” for additional details.

The Company estimates that approximately $14 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

During the three and nine months ended September 30, 2019, the Company recorded losses of $16 million and $20 million, respectively, in Other income (expense) for foreign exchange derivatives not accounted for as hedges. During the three and nine months ended September 30, 2018, the Company recorded losses of $4 million and $15 million, respectively, in Other income (expense) for foreign exchange derivatives not accounted for as hedges.

Net Investments in Foreign Operations Risk Management

The Company uses non-derivative financial instruments to protect the value of its investments in a number of foreign subsidiaries. The Company has designated a portion of its euro-denominated commercial paper issuances as a non-derivative hedge of the foreign currency exposure of a net investment in its European operations. The change in fair value of the designated portion of the euro-denominated commercial paper due to changes in foreign currency exchange rates is recorded in Foreign currency translation adjustment, a component of Accumulated other comprehensive loss, to the extent it is effective as a hedge. The foreign currency translation adjustment of the hedged net investments is also recorded in Accumulated other comprehensive loss. Ineffective portions of net investment hedges, if any, are reclassified from Accumulated other comprehensive loss into earnings during the period of change.

The Company had €500 million ($546 million at September 30, 2019 exchange rates) and €220 million ($250 million at December 31, 2018 exchange rates) of outstanding euro-denominated commercial paper at September 30, 2019 and December 31, 2018, respectively, designated as a hedge of the foreign currency exposure of its net investment in its European operations. The unrealized gain recognized in Accumulated other comprehensive loss related to the net investment non derivative hedging instrument was $38 million and $21 million, as of September 30, 2019 and December 31, 2018, respectively.

The Company did not reclassify any deferred gains or losses related to net investment hedges from Accumulated other comprehensive loss to earnings during the three and nine months ended September 30, 2019 and 2018.

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Fair Value Measurements and Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities that are measured at fair value on a recurring basis

The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at September 30, 2019 and December 31, 2018 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,851	$	1,851	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	1	$	—	$	1	$	—
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—
Liabilities
Derivatives (2)
Gross foreign exchange contracts	$	3	$	—	$	3	$	—

			Fair Value Measurements Using
	Balance at December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,759	$	1,759	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	2	$	—	$	2	$	—
Derivatives (2)
Gross foreign exchange contracts	$	21	$	—	$	21	$	—
Liabilities					0
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—

(1) Included within Fiduciary assets or Short-term investments in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. 

(2)

Refer to Note 15 “Derivatives and Hedging” for additional information regarding the Company’s derivatives and hedging activity.

Schedule of financial instruments where the carrying amounts and fair values differ

The fair value of debt is classified as Level 2 of the fair value hierarchy. The following table provides the carrying value and fair value for the Company’s term debt (in millions):

	September 30, 2019				December 31, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
Current portion of long-term debt	$	599	$	617	$	—	$	—
Long-term debt	$	6,120	$	6,915	$	5,993	$	6,159

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Accounting Principles and Practices - Schedule of Changes to Balance Sheet for New Accounting Standards (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Operating lease right-of-use assets	$ 913
Other non-current assets	562		$ 448
Liabilities
Other current liabilities	1,163		936
Non-current operating lease liabilities	922
Other non-current liabilities	$ 953		1,097
Accounting Standards Update 2016-02
Assets
Operating lease right-of-use assets		$ 1,100
Operating lease right-of-use assets
Assets
Operating lease right-of-use assets		1,021
Operating lease right-of-use assets | Accounting Standards Update 2016-02
Assets
Operating lease right-of-use assets		1,021
Other non-current assets
Assets
Other non-current assets		526	448
Other non-current assets | Accounting Standards Update 2016-02
Assets
Other non-current assets		78
Other current liabilities
Liabilities
Other current liabilities		1,155	936
Other current liabilities | Accounting Standards Update 2016-02
Liabilities
Other current liabilities		219
Non-current operating lease liabilities
Liabilities
Non-current operating lease liabilities		1,014
Non-current operating lease liabilities | Accounting Standards Update 2016-02
Liabilities
Non-current operating lease liabilities		1,014
Other non-current liabilities
Liabilities
Other non-current liabilities		963	$ 1,097
Other non-current liabilities | Accounting Standards Update 2016-02
Liabilities
Other non-current liabilities		$ (134)

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Shareholders' Equity - Schedule of Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						4 Months Ended	9 Months Ended		90 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Oct. 25, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Class of Stock [Line Items]
Total repurchase cost	$ 350.0	$ 1,056.0	$ 101.0	$ 301.0	$ 402.0	$ 553.0
2012 - Share Repurchase Program
Class of Stock [Line Items]
Shares purchased (in shares)	1,800			2,100				8,200	8,800	126,500
Average price per share of stock repurchased (in dollars per share)	$ 190.83			$ 145.71				$ 183.26	$ 142.15
Total repurchase cost	$ 350.0			$ 300.0				$ 1,500.0	$ 1,250.0	$ 12,500.0
Additional associated costs	0.0			1.0				7.0	6.0
Total costs recorded to retained earnings	$ 350.0			$ 301.0				$ 1,507.0	$ 1,256.0
Subsequent Event | 2012 - Share Repurchase Program
Class of Stock [Line Items]
Shares purchased (in shares)							25
Average price per share of stock repurchased (in dollars per share)							$ 193.91
Total repurchase cost							$ 4.8

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Debt - Narrative (Details)	Sep. 30, 2019 USD ($) credit_facility	Sep. 30, 2019 EUR (€) credit_facility	May 02, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 03, 2018 USD ($)	Mar. 08, 2018 USD ($)	Mar. 08, 2018 CAD ($)
Debt Instrument [Line Items]
Short-term debt and current portion of long-term debt	$ 1,148,000,000			$ 251,000,000
Number of credit facilities | credit_facility	2	2
5.00% Senior Notes Due September 2020
Debt Instrument [Line Items]
Debt face value	$ 600,000,000
Debt interest rate percentage (as a percent)	5.00%	5.00%
3.75% Senior Notes Due May 2, 2029 | Senior Notes
Debt Instrument [Line Items]
Debt face value			$ 750,000,000
Debt interest rate percentage (as a percent)	3.75%	3.75%	3.75%
4.500% Senior Notes Due December 2028 | Senior Notes
Debt Instrument [Line Items]
Debt face value					$ 350,000,000
Debt interest rate percentage (as a percent)	4.50%	4.50%			4.50%
4.76% Senior Notes Due March 2018 | Senior Notes
Debt Instrument [Line Items]
Debt interest rate percentage (as a percent)						4.76%	4.76%
Short-term debt and current portion of long-term debt						$ 291,000,000	$ 375,000,000
Foreign Line of Credit | 2020 Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 900,000,000
Credit Facility Expiring October 2022
Debt Instrument [Line Items]
Borrowings	0
Credit Facility Expiring October 2022 | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	400,000,000
Commercial paper | Commercial Paper Programs
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	1,300,000,000
United States | Commercial paper | Commercial Paper Programs
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000
Europe | Commercial paper | Commercial Paper Programs
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity | €		€ 525,000,000

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Lease Commitments - Cash Flow of Lessee (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$ 182
Financing cash flows from finance leases	11
Non-cash related activities
ROU assets obtained in exchange for new operating lease liabilities	95
ROU assets obtained in exchange for new finance lease liabilities	$ 48

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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Cash provided by (used for) operating activities	$ 1,163	$ 975
Cash flows from investing activities
Proceeds from investments	33	30
Payments for investments	(94)	(65)
Net sales (purchases) of short-term investments - non-fiduciary	(7)	356
Acquisition of businesses, net of cash acquired	(39)	(50)
Sale of businesses, net of cash sold	43	(8)
Capital expenditures	(167)	(179)
Cash provided by (used for) investing activities	(231)	84
Cash flows from financing activities
Share repurchase	(1,507)	(1,272)
Advances from (to) affiliates	0	0
Issuance of shares for employee benefit plans	(133)	(139)
Issuance of debt	4,918	3,960
Repayment of debt	(3,858)	(3,498)
Cash dividends to shareholders	(307)	(285)
Noncontrolling interests and other financing activities	(81)	(21)
Cash used for financing activities	(968)	(1,255)
Effect of exchange rates on cash and cash equivalents	(18)	(76)
Net increase (decrease) in cash and cash equivalents	(54)	(272)
Cash and cash equivalents at beginning of period	656	756
Cash and cash equivalents at end of period	602	484
Aon plc
Cash flows from operating activities
Cash provided by (used for) operating activities	356	(143)
Cash flows from investing activities
Proceeds from investments		0
Payments for investments	0	(12)
Net sales (purchases) of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0
Cash provided by (used for) investing activities	0	(12)
Cash flows from financing activities
Share repurchase	(1,507)	(1,272)
Advances from (to) affiliates	1,277	1,292
Issuance of shares for employee benefit plans	(133)	(139)
Issuance of debt	2,099	1,258
Repayment of debt	(1,785)	(700)
Cash dividends to shareholders	(307)	(285)
Noncontrolling interests and other financing activities	0	0
Cash used for financing activities	(356)	154
Effect of exchange rates on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	(1)
Cash and cash equivalents at beginning of period	0	1
Cash and cash equivalents at end of period	0	0
Aon Corporation
Cash flows from operating activities
Cash provided by (used for) operating activities	(118)	479
Cash flows from investing activities
Proceeds from investments	17	16
Payments for investments	(46)	(36)
Net sales (purchases) of short-term investments - non-fiduciary	(7)	308
Acquisition of businesses, net of cash acquired	0	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0	0
Cash provided by (used for) investing activities	(36)	288
Cash flows from financing activities
Share repurchase	0	0
Advances from (to) affiliates	79	(1,564)
Issuance of shares for employee benefit plans	0	0
Issuance of debt	2,816	2,701
Repayment of debt	(2,073)	(2,501)
Cash dividends to shareholders	0	0
Noncontrolling interests and other financing activities	0	0
Cash used for financing activities	822	(1,364)
Effect of exchange rates on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	668	(597)
Cash and cash equivalents at beginning of period	862	2,524
Cash and cash equivalents at end of period	1,530	1,927
Other Non-Guarantor Subsidiaries
Cash flows from operating activities
Cash provided by (used for) operating activities	1,578	2,258
Cash flows from investing activities
Proceeds from investments	16	14
Payments for investments	(49)	(29)
Net sales (purchases) of short-term investments - non-fiduciary	0	48
Acquisition of businesses, net of cash acquired	(39)	(50)
Sale of businesses, net of cash sold	43	(8)
Capital expenditures	(167)	(179)
Cash provided by (used for) investing activities	(196)	(204)
Cash flows from financing activities
Share repurchase	0	0
Advances from (to) affiliates	(1,370)	(2,054)
Issuance of shares for employee benefit plans	0	0
Issuance of debt	3	1
Repayment of debt	0	(297)
Cash dividends to shareholders	0	0
Noncontrolling interests and other financing activities	(81)	(21)
Cash used for financing activities	(1,448)	(2,371)
Effect of exchange rates on cash and cash equivalents	(18)	(76)
Net increase (decrease) in cash and cash equivalents	(84)	(393)
Cash and cash equivalents at beginning of period	575	793
Cash and cash equivalents at end of period	491	400
Consolidation Adjustments
Cash flows from operating activities
Cash provided by (used for) operating activities	(653)	(1,619)
Cash flows from investing activities
Proceeds from investments		0
Payments for investments	1	12
Net sales (purchases) of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Sale of businesses, net of cash sold	0	0
Capital expenditures	0	0
Cash provided by (used for) investing activities	1	12
Cash flows from financing activities
Share repurchase	0	0
Advances from (to) affiliates	14	2,326
Issuance of shares for employee benefit plans	0	0
Issuance of debt		0
Repayment of debt	0	0
Cash dividends to shareholders	0	0
Noncontrolling interests and other financing activities	0	0
Cash used for financing activities	14	2,326
Effect of exchange rates on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(638)	719
Cash and cash equivalents at beginning of period	(781)	(2,562)
Cash and cash equivalents at end of period	$ (1,419)	$ (1,843)

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Acquisitions and Dispositions of Businesses - Acquisitions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) acquisition	Sep. 30, 2018 acquisition	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Number of business acquired under business combination | acquisition	3	5
Assets acquired
Goodwill	$ 8,071		$ 8,171
2019 Acquisitions
Business Combination, Consideration Transferred [Abstract]
Consideration Transferred	42
Deferred and contingent consideration	8
Aggregate consideration transferred	50
Assets acquired
Cash and cash equivalents	4
Receivables, net	1
Goodwill	33
Intangible assets, net	22
Fixed assets, net	1
Other assets	13
Total assets acquired	74
Liabilities assumed
Current liabilities	18
Other non-current liabilities	6
Total liabilities assumed	24
Net assets acquired	$ 50

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Segment Information

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates as one segment that includes all of Aon’s continuing operations, which as a global professional services firm provides advice and solutions to clients focused on risk, retirement, and health through five revenue lines which make up its principal products and services. The Chief Operating Decision Maker (the “CODM”) assesses the performance of the Company and allocates resources based on one segment: Aon United.

The Company’s reportable operating segment has been determined using a management approach, which is consistent with the basis and manner in which Aon’s CODM uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance and allocates resources based on total Aon results against its key four metrics, including organic revenue growth, expense discipline, and collaborative behaviors that maximize value for Aon and its shareholders, regardless of which revenue line it benefits.

As Aon operates as one segment, segment profit or loss is consistent with consolidated reporting as disclosed on the Condensed Consolidated Statements of Income. Refer to Note 3 “Revenue from Contracts with Customers” for further information on revenue by principal service line.

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Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Share-Based Compensation Plans

Share-Based Compensation Plans

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Restricted share units (“RSUs”)	$	42	$	41	$	155	$	145
Performance share awards (“PSAs”)	28		24		90		63
Employee share purchase plans	2		2		7		6
Total share-based compensation expense	$	72	$	67	$	252	$	214

Restricted Share Units

RSUs generally vest between three and five years. The fair value of RSUs is based upon the market value of Aon plc ordinary shares at the date of grant. With certain limited exceptions, any break in continuous employment will cause the forfeiture of all non-vested awards. Compensation expense associated with RSUs is recognized on a straight-line basis over the requisite service period. Dividend equivalents are paid on certain RSUs, based on the initial grant amount.

The following table summarizes the status of the Company’s RSUs, including shares related to the Divested Business (shares in thousands, except fair value):

	Nine Months Ended September 30, 2019				Nine Months Ended September 30, 2018
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	4,208		$	120	4,849		$	104
Granted	1,225		$	174	1,409		$	140
Vested	(1,551	)	$	112	(1,772	)	$	97
Forfeited	(164	)	$	128	(158	)	$	111
Non-vested at end of period	3,718		$	141	4,328		$	118

(1) Represents per share weighted average fair value of award at date of grant.

Unamortized deferred compensation expense amounted to $384 million as of September 30, 2019, with a remaining weighted average amortization period of approximately 2.1 years.

Performance Share Awards

The vesting of PSAs is contingent upon meeting a cumulative level of earnings per share related performance over a three-year period. The actual issuance of shares may range from 0-200% of the target number of PSAs granted, based on the terms of the plan and level of achievement of the related performance target. The grant date fair value of PSAs is based upon the market price of Aon plc ordinary shares at the date of grant. The performance conditions are not considered in the determination of the grant date fair value for these awards. Compensation expense is recognized over the performance period based on management’s estimate of the number of units expected to vest. Management evaluates its estimate of the actual number of shares expected to be issued at the end of the programs on a quarterly basis. The cumulative effect of the change in estimate is recognized in the period of change as an adjustment to Compensation and benefits in the Condensed Consolidated Statements of Income, if necessary. Dividend equivalents are not paid on PSAs.

The following table summarizes the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the nine months ended September 30, 2019 and the years ended December 31, 2018 and 2017, respectively (shares in thousands and dollars in millions, except fair value):

	September 30, 2019		December 31, 2018		December 31, 2017
Target PSAs granted during period	467		564		548
Weighted average fair value per share at date of grant	$	164	$	134	$	114
Number of shares that would be issued based on current performance levels	458		958		1,057
Unamortized expense, based on current performance levels	$	61	$	54	$	10

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Guarantee of Registered Securities (Tables)

9 Months Ended

Sep. 30, 2019

Guarantee of Registered Securities [Abstract]

Condensed Consolidating Statements of Income

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,379		$	—		$	2,379
Expenses
Compensation and benefits	12			2			1,354			—			1,368
Information technology	—			—			120			—			120
Premises	—			4			72			—			76
Depreciation of fixed assets	—			—			44			—			44
Amortization and impairment of intangible assets	—			—			101			—			101
Other general expense (income)	2			1			307			—			310
Total operating expenses	14			7			1,998			—			2,019
Operating income (loss)	(14		)	(7		)	381			—			360
Interest income	—			11			—			(10		)	1
Interest expense	(47		)	(35		)	(6		)	10			(78		)
Intercompany interest income (expense)	4			(116		)	112			—			—
Intercompany other income (expense)	(70		)	(9		)	79			—			—
Other income (expense)	39			(22		)	7			(22		)	2
Income (loss) from continuing operations before income taxes	(88		)	(178		)	573			(22		)	285
Income tax expense (benefit)	(2		)	(35		)	93			—			56
Net income (loss) from continuing operations	(86		)	(143		)	480			(22		)	229
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(86		)	(143		)	479			(22		)	228
Equity in earnings of subsidiaries	330			107			(36		)	(401		)	—
Net income (loss)	244			(36		)	443			(423		)	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	244		$	(36	)	$	437		$	(423	)	$	222

Condensed Consolidating Statement of Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	2,349		$	—		$	2,349
Expenses
Compensation and benefits	13			3			1,376			—			1,392
Information technology	—			—			125			—			125
Premises	—			—			94			—			94
Depreciation of fixed assets	—			—			40			—			40
Amortization and impairment of intangible assets	—			—			100			—			100
Other general expense (income)	—			(1		)	337			—			336
Total operating expenses	13			2			2,072			—			2,087
Operating income (loss)	(13		)	(2		)	277			—			262
Interest income	—			15			—			(15		)	—
Interest expense	(52		)	(26		)	(6		)	15			(69		)
Intercompany interest income (expense)	4			(128		)	124			—			—
Intercompany other income (expense)	245			(245		)	—			—			—
Other income (expense)	(5		)	(3		)	7			2			1
Income (loss) from continuing operations before income taxes	179			(389		)	402			2			194
Income tax expense (benefit)	(8		)	(67		)	114			—			39
Net income (loss) from continuing operations	187			(322		)	288			2			155
Net income (loss) from discontinued operations	—			—			(2		)	—			(2		)
Net income (loss) before equity in earnings of subsidiaries	187			(322		)	286			2			153
Equity in earnings of subsidiaries	(42		)	(42		)	(364		)	448			—
Net income (loss)	145			(364		)	(78		)	450			153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	$	145		$	(364	)	$	(84	)	$	450		$	147

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,128		$	—		$	8,128
Expenses
Compensation and benefits	54			14			4,385			—			4,453
Information technology	—			—			363			—			363
Premises	—			17			231			—			248
Depreciation of fixed assets	—			—			124			—			124
Amortization and impairment of intangible assets	—			—			295			—			295
Other general expense (income)	5			3			992			—			1,000
Total operating expenses	59			34			6,390			—			6,483
Operating income (loss)	(59		)	(34		)	1,738			—			1,645
Interest income	—			29			—			(25		)	4
Interest expense	(138		)	(97		)	(17		)	25			(227		)
Intercompany interest income (expense)	11			(348		)	337			—			—
Intercompany other income (expense)	98			(272		)	174			—			—
Other income (expense)	33			(47		)	39			(17		)	8
Income (loss) from continuing operations before income taxes	(55		)	(769		)	2,271			(17		)	1,430
Income tax expense (benefit)	(7		)	(141		)	386			—			238
Net income (loss) from continuing operations	(48		)	(628		)	1,885			(17		)	1,192
Net income (loss) from discontinued operations	—			—			(1		)	—			(1		)
Net income (loss) before equity in earnings of subsidiaries	(48		)	(628		)	1,884			(17		)	1,191
Equity in earnings of subsidiaries	1,223			1,132			504			(2,859		)	—
Net income (loss)	1,175			504			2,388			(2,876		)	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	$	1,175		$	504		$	2,355		$	(2,876	)	$	1,158

Condensed Consolidating Statement of Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue
Total revenue	$	—		$	—		$	8,000		$	—		$	8,000
Expenses
Compensation and benefits	47			5			4,450			—			4,502
Information technology	—			—			363			—			363
Premises	—			—			283			—			283
Depreciation of fixed assets	—			—			126			—			126
Amortization and impairment of intangible assets	—			—			492			—			492
Other general expense (income)	3			90			1,096			—			1,189
Total operating expenses	50			95			6,810			—			6,955
Operating income (loss)	(50		)	(95		)	1,190			—			1,045
Interest income	—			44			—			(39		)	5
Interest expense	(149		)	(75		)	(23		)	39			(208		)
Intercompany interest income (expense)	11			(385		)	374			—			—
Intercompany other income (expense)	99			(240		)	141			—			—
Other income (expense)	18			(29		)	7			(13		)	(17		)
Income (loss) from continuing operations before income taxes	(71		)	(780		)	1,689			(13		)	825
Income tax expense (benefit)	(27		)	(144		)	180			—			9
Net income (loss) from continuing operations	(44		)	(636		)	1,509			(13		)	816
Net income (loss) from discontinued operations	—			—			5			—			5
Net income (loss) before equity in earnings of subsidiaries	(44		)	(636		)	1,514			(13		)	821
Equity in earnings of subsidiaries	846			870			234			(1,950		)	—
Net income (loss)	802			234			1,748			(1,963		)	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	$	802		$	234		$	1,716		$	(1,963	)	$	789

Condensed Consolidating Statements of Comprehensive Income

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	244		$	(36	)	$	443		$	(423	)	$	228
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	244			(36		)	437			(423		)	222
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			—			(2		)	—			(2		)
Foreign currency translation adjustments	—			—			(234		)	22			(212		)
Postretirement benefit obligation	—			10			7			—			17
Total other comprehensive income (loss)	—			10			(229		)	22			(197		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(215		)	(220		)	(210		)	645			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(4		)	—			(4		)
Total other comprehensive income (loss) attributable to Aon shareholders	(215		)	(210		)	(435		)	667			(193		)
Comprehensive income (loss) attributable to Aon shareholders	$	29		$	(246	)	$	2		$	244		$	29

Condensed Consolidating Statement of Comprehensive Income

	Three Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	145		$	(364	)	$	(78	)	$	450		$	153
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income (loss) attributable to Aon shareholders	145			(364		)	(84		)	450			147
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(2		)	3			—			1
Foreign currency translation adjustments	—			—			(48		)	(2		)	(50		)
Postretirement benefit obligation	—			12			(74		)	—			(62		)
Total other comprehensive income (loss)	—			10			(119		)	(2		)	(111		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(106		)	(134		)	(124		)	364			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(3		)	—			(3		)
Total other comprehensive income (loss) attributable to Aon shareholders	(106		)	(124		)	(240		)	362			(108		)
Comprehensive income (loss) attributable to Aon shareholders	$	39		$	(488	)	$	(324	)	$	812		$	39

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	1,175		$	504		$	2,388		$	(2,876	)	$	1,191
Less: Net income attributable to noncontrolling interests	—			—			33			—			33
Net income (loss) attributable to Aon shareholders	1,175			504			2,355			(2,876		)	1,158
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			2			(5		)	—			(3		)
Foreign currency translation adjustments	—			—			(199		)	17			(182		)
Postretirement benefit obligation	—			42			20			—			62
Total other comprehensive income (loss)	—			44			(184		)	17			(123		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(138		)	(223		)	(179		)	540			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(2		)	—			(2		)
Total other comprehensive income (loss) attributable to Aon shareholders	(138		)	(179		)	(361		)	557			(121		)
Comprehensive income (loss) attributable to Aon shareholders	$	1,037		$	325		$	1,994		$	(2,319	)	$	1,037

Condensed Consolidating Statement of Comprehensive Income

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net income (loss)	$	802		$	234		$	1,748		$	(1,963	)	$	821
Less: Net income attributable to noncontrolling interests	—			—			32			—			32
Net income (loss) attributable to Aon shareholders	802			234			1,716			(1,963		)	789
Other comprehensive income (loss), net of tax:
Change in fair value of financial instruments	—			(3		)	17			—			14
Foreign currency translation adjustments	—			—			(276		)	13			(263		)
Postretirement benefit obligation	—			34			74			—			108
Total other comprehensive income (loss)	—			31			(185		)	13			(141		)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(148		)	(194		)	(163		)	505			—
Less: Other comprehensive loss attributable to noncontrolling interests	—			—			(6		)	—			(6		)
Total other comprehensive income (loss) attributable to Aon shareholders	(148		)	(163		)	(342		)	518			(135		)
Comprehensive income (loss) attributable to Aon shareholders	$	654		$	71		$	1,374		$	(1,445	)	$	654

Condensed Consolidating Statements of Financial Position

Condensed Consolidating Statement of Financial Position

	As of September 30, 2019
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	1,530		$	491		$	(1,419	)	$	602
Short-term investments	—		63			114			—			177
Receivables, net	—		—			2,866			—			2,866
Fiduciary assets	—		—			11,041			—			11,041
Current intercompany receivables	153		4,090			13,669			(17,912		)	—
Other current assets	—		6			625			—			631
Total current assets	153		5,689			28,806			(19,331		)	15,317
Goodwill	—		—			8,071			—			8,071
Intangible assets, net	—		—			874			—			874
Fixed assets, net	—		—			606			—			606
Operating lease right-of-use assets	—		109			804			—			913
Deferred tax assets	93		513			150			(145		)	611
Prepaid pension	—		5			1,208			—			1,213
Non-current intercompany receivables	394		261			7,198			(7,853		)	—
Other non-current assets	2		35			525			—			562
Investment in subsidiary	9,052		20,085			(725		)	(28,412		)	—
Total assets	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	1,171	$	42		$	1,705		$	(1,419	)	$	1,499
Short-term debt and current portion of long-term debt	546		599			3			—			1,148
Fiduciary liabilities	—		—			11,041			—			11,041
Current intercompany payables	268		15,956			1,688			(17,912		)	—
Other current liabilities	—		79			1,084			—			1,163
Total current liabilities	1,985		16,676			15,521			(19,331		)	14,851
Long-term debt	4,213		1,907			—			—			6,120
Non-current operating lease liabilities	—		146			776			—			922
Deferred tax liabilities	1		—			353			(145		)	209
Pension, other postretirement, and postemployment liabilities	—		1,222			329			—			1,551
Non-current intercompany payables	—		7,364			489			(7,853		)	—
Other non-current liabilities	3		107			843			—			953
Total liabilities	6,202		27,422			18,311			(27,329		)	24,606
Equity
Total Aon shareholders’ equity	3,492		(725		)	29,137			(28,412		)	3,492
Noncontrolling interests	—		—			69			—			69
Total equity	3,492		(725		)	29,206			(28,412		)	3,561
Total liabilities and equity	$	9,694	$	26,697		$	47,517		$	(55,741	)	$	28,167

Condensed Consolidating Statement of Financial Position

	As of December 31, 2018
(millions)	Aon plc		Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Assets
Current assets
Cash and cash equivalents	$	—	$	862		$	575		$	(781	)	$	656
Short-term investments	—		56			116			—			172
Receivables, net	—		—			2,760			—			2,760
Fiduciary assets	—		—			10,166			—			10,166
Current intercompany receivables	191		897			11,634			(12,722		)	—
Other current assets	—		16			602			—			618
Total current assets	191		1,831			25,853			(13,503		)	14,372
Goodwill	—		—			8,171			—			8,171
Intangible assets, net	—		—			1,149			—			1,149
Fixed assets, net	—		—			588			—			588
Operating lease right-of-use assets	—		—			—			—			—
Deferred tax assets	94		467			144			(144		)	561
Prepaid pension	—		5			1,128			—			1,133
Non-current intercompany receivables	403		261			7,225			(7,889		)	—
Other non-current assets	1		30			417			—			448
Investment in subsidiary	8,433		19,132			(882		)	(26,683		)	—
Total assets	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422
Liabilities and equity
Liabilities
Current liabilities
Accounts payable and accrued liabilities	$	274	$	70		$	2,380		$	(781	)	$	1,943
Short-term debt and current portion of long-term debt	250		—			1			—			251
Fiduciary liabilities	—		—			10,166			—			10,166
Current intercompany payables	213		11,875			634			(12,722		)	—
Other current liabilities	—		69			867			—			936
Total current liabilities	737		12,014			14,048			(13,503		)	13,296
Long-term debt	4,231		1,762			—			—			5,993
Non-current operating lease liabilities	—		—			—			—			—
Deferred tax liabilities	—		—			325			(144		)	181
Pension, other postretirement, and postemployment liabilities	—		1,275			361			—			1,636
Non-current intercompany payables	—		7,390			499			(7,889		)	—
Other non-current liabilities	3		167			927			—			1,097
Total liabilities	4,971		22,608			16,160			(21,536		)	22,203
Equity
Total Aon shareholders’ equity	4,151		(882		)	27,565			(26,683		)	4,151
Noncontrolling interests	—		—			68			—			68
Total equity	4,151		(882		)	27,633			(26,683		)	4,219
Total liabilities and equity	$	9,122	$	21,726		$	43,793		$	(48,219	)	$	26,422

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2019
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	356		$	(118	)	$	1,578		$	(653	)	$	1,163
Cash flows from investing activities
Proceeds from investments				17			16						33
Payments for investments	—			(46		)	(49		)	1			(94		)
Net sales (purchases) of short-term investments - non-fiduciary	—			(7		)	—			—			(7		)
Acquisition of businesses, net of cash acquired	—			—			(39		)	—			(39		)
Sale of businesses, net of cash sold	—			—			43			—			43
Capital expenditures	—			—			(167		)	—			(167		)
Cash provided by (used for) investing activities	—			(36		)	(196		)	1			(231		)
Cash flows from financing activities
Share repurchase	(1,507		)	—			—			—			(1,507		)
Advances from (to) affiliates	1,277			79			(1,370		)	14			—
Issuance of shares for employee benefit plans	(133		)	—			—			—			(133		)
Issuance of debt	2,099			2,816			3						4,918
Repayment of debt	(1,785		)	(2,073		)	—			—			(3,858		)
Cash dividends to shareholders	(307		)	—			—			—			(307		)
Noncontrolling interests and other financing activities	—			—			(81		)	—			(81		)
Cash provided by (used for) financing activities	(356		)	822			(1,448		)	14			(968		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(18		)	—			(18		)
Net increase (decrease) in cash and cash equivalents	—			668			(84		)	(638		)	(54		)
Cash and cash equivalents at beginning of period	—			862			575			(781		)	656
Cash and cash equivalents at end of period	$	—		$	1,530		$	491		$	(1,419	)	$	602

Condensed Consolidating Statement of Cash Flows

	Nine Months Ended September 30, 2018
(millions)	Aon plc			Aon Corporation			Other Non-Guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Cash flows from operating activities
Cash provided by (used for) operating activities	$	(143	)	$	479		$	2,258		$	(1,619	)	$	975
Cash flows from investing activities
Proceeds from investments	—			16			14			—			30
Payments for investments	(12		)	(36		)	(29		)	12			(65		)
Net sales (purchases) of short-term investments - non-fiduciary	—			308			48			—			356
Acquisition of businesses, net of cash acquired	—			—			(50		)	—			(50		)
Sale of businesses, net of cash sold	—			—			(8		)	—			(8		)
Capital expenditures				—			(179		)	—			(179		)
Cash provided by (used for) investing activities	(12		)	288			(204		)	12			84
Cash flows from financing activities
Share repurchase	(1,272		)	—			—			—			(1,272		)
Advances from (to) affiliates	1,292			(1,564		)	(2,054		)	2,326			—
Issuance of shares for employee benefit plans	(139		)	—			—			—			(139		)
Issuance of debt	1,258			2,701			1			—			3,960
Repayment of debt	(700		)	(2,501		)	(297		)	—			(3,498		)
Cash dividends to shareholders	(285		)	—			—			—			(285		)
Noncontrolling interests and other financing activities	—			—			(21		)	—			(21		)
Cash provided by (used for) financing activities	154			(1,364		)	(2,371		)	2,326			(1,255		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(76		)	—			(76		)
Net increase (decrease) in cash and cash equivalents	(1		)	(597		)	(393		)	719			(272		)
Cash and cash equivalents at beginning of period	1			2,524			793			(2,562		)	756
Cash and cash equivalents at end of period	$	—		$	1,927		$	400		$	(1,843	)	$	484

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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,379	$ 2,349	$ 8,128	$ 8,000
United States
Disaggregation of Revenue [Line Items]
Total revenue	1,209	1,215	3,516	3,456
Americas other than United States
Disaggregation of Revenue [Line Items]
Total revenue	256	203	723	683
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	358	264	1,210	1,161
Europe, Middle East, & Africa other than United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	283	399	1,793	1,871
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	273	268	886	829
Operating Segments | Commercial Risk Solutions
Disaggregation of Revenue [Line Items]
Total revenue	1,057	1,029	3,342	3,379
Operating Segments | Reinsurance Solutions
Disaggregation of Revenue [Line Items]
Total revenue	291	279	1,499	1,401
Operating Segments | Retirement Solutions
Disaggregation of Revenue [Line Items]
Total revenue	484	501	1,323	1,356
Operating Segments | Health Solutions
Disaggregation of Revenue [Line Items]
Total revenue	279	278	1,082	1,038
Operating Segments | Data & Analytic Services
Disaggregation of Revenue [Line Items]
Total revenue	271	263	893	834
Elimination
Disaggregation of Revenue [Line Items]
Total revenue	$ (3)	$ (1)	$ (11)	$ (8)

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- Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Intangible assets with finite lives
Gross Carrying Amount	$ 3,629	$ 3,658
Accumulated Amortization and Impairment	2,755	2,509
Net Carrying Amount	874	1,149
Estimated amortization for intangible assets
Remainder of 2019	96
2020	220
2021	126
2022	86
2023	76
2024	59
Thereafter	211
Total	874
Customer related and contract based
Intangible assets with finite lives
Gross Carrying Amount	2,229	2,240
Accumulated Amortization and Impairment	1,531	1,444
Net Carrying Amount	698	796
Tradenames
Intangible assets with finite lives
Gross Carrying Amount	1,025	1,027
Accumulated Amortization and Impairment	899	740
Net Carrying Amount	126	287
Technology and other
Intangible assets with finite lives
Gross Carrying Amount	375	391
Accumulated Amortization and Impairment	325	325
Net Carrying Amount	$ 50	$ 66

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Lease Commitments - Lease Terms and Assumptions (Details)	Sep. 30, 2019
Weighted average remaining lease term (years)
Operating leases	8 years
Finance leases	4 years 7 months 6 days
Weighted average discount rate
Operating leases	3.30%
Finance leases	2.00%

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Guarantee of Registered Securities - Condensed Consolidating Statement of Financial Position (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 602			$ 656
Short-term investments	177			172
Receivables, net	2,866			2,760
Fiduciary assets	11,041			10,166
Current intercompany receivables	0			0
Other current assets	631			618
Total current assets	15,317			14,372
Goodwill	8,071			8,171
Intangible assets, net	874			1,149
Fixed assets, net	606			588
Operating lease right-of-use assets	913
Deferred tax assets	611			561
Prepaid pension	1,213			1,133
Non-current intercompany receivables	0			0
Other non-current assets	562			448
Investment in subsidiary	0			0
Total assets	28,167			26,422
Current liabilities
Accounts payable and accrued liabilities	1,499			1,943
Short-term debt and current portion of long-term debt	1,148			251
Fiduciary liabilities	11,041			10,166
Current intercompany payables	0			0
Other current liabilities	1,163			936
Total current liabilities	14,851			13,296
Long-term debt	6,120			5,993
Non-current operating lease liabilities	922
Deferred tax liabilities	209			181
Pension, other postretirement, and postemployment liabilities	1,551			1,636
Non-current intercompany payables	0			0
Other non-current liabilities	953			1,097
Total liabilities	24,606			22,203
Total Aon shareholders’ equity	3,492			4,151
Noncontrolling interests	69			68
Total equity	3,561	$ 3,913	$ 4,862	4,219	$ 4,328	$ 4,618	$ 5,385	$ 5,140
Total liabilities and equity	28,167			26,422
Aon plc
Current assets
Cash and cash equivalents	0			0
Short-term investments	0			0
Receivables, net	0			0
Fiduciary assets	0			0
Current intercompany receivables	153			191
Other current assets	0			0
Total current assets	153			191
Goodwill	0			0
Intangible assets, net	0			0
Fixed assets, net	0			0
Operating lease right-of-use assets	0
Deferred tax assets	93			94
Prepaid pension	0			0
Non-current intercompany receivables	394			403
Other non-current assets	2			1
Investment in subsidiary	9,052			8,433
Total assets	9,694			9,122
Current liabilities
Accounts payable and accrued liabilities	1,171			274
Short-term debt and current portion of long-term debt	546			250
Fiduciary liabilities	0			0
Current intercompany payables	268			213
Other current liabilities	0			0
Total current liabilities	1,985			737
Long-term debt	4,213			4,231
Non-current operating lease liabilities	0
Deferred tax liabilities	1			0
Pension, other postretirement, and postemployment liabilities	0			0
Non-current intercompany payables	0			0
Other non-current liabilities	3			3
Total liabilities	6,202			4,971
Total Aon shareholders’ equity	3,492			4,151
Noncontrolling interests	0			0
Total equity	3,492			4,151
Total liabilities and equity	9,694			9,122
Aon Corporation
Current assets
Cash and cash equivalents	1,530			862
Short-term investments	63			56
Receivables, net	0			0
Fiduciary assets	0			0
Current intercompany receivables	4,090			897
Other current assets	6			16
Total current assets	5,689			1,831
Goodwill	0			0
Intangible assets, net	0			0
Fixed assets, net	0			0
Operating lease right-of-use assets	109
Deferred tax assets	513			467
Prepaid pension	5			5
Non-current intercompany receivables	261			261
Other non-current assets	35			30
Investment in subsidiary	20,085			19,132
Total assets	26,697			21,726
Current liabilities
Accounts payable and accrued liabilities	42			70
Short-term debt and current portion of long-term debt	599			0
Fiduciary liabilities	0			0
Current intercompany payables	15,956			11,875
Other current liabilities	79			69
Total current liabilities	16,676			12,014
Long-term debt	1,907			1,762
Non-current operating lease liabilities	146
Deferred tax liabilities	0			0
Pension, other postretirement, and postemployment liabilities	1,222			1,275
Non-current intercompany payables	7,364			7,390
Other non-current liabilities	107			167
Total liabilities	27,422			22,608
Total Aon shareholders’ equity	(725)			(882)
Noncontrolling interests	0			0
Total equity	(725)			(882)
Total liabilities and equity	26,697			21,726
Other Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	491			575
Short-term investments	114			116
Receivables, net	2,866			2,760
Fiduciary assets	11,041			10,166
Current intercompany receivables	13,669			11,634
Other current assets	625			602
Total current assets	28,806			25,853
Goodwill	8,071			8,171
Intangible assets, net	874			1,149
Fixed assets, net	606			588
Operating lease right-of-use assets	804
Deferred tax assets	150			144
Prepaid pension	1,208			1,128
Non-current intercompany receivables	7,198			7,225
Other non-current assets	525			417
Investment in subsidiary	(725)			(882)
Total assets	47,517			43,793
Current liabilities
Accounts payable and accrued liabilities	1,705			2,380
Short-term debt and current portion of long-term debt	3			1
Fiduciary liabilities	11,041			10,166
Current intercompany payables	1,688			634
Other current liabilities	1,084			867
Total current liabilities	15,521			14,048
Long-term debt	0			0
Non-current operating lease liabilities	776
Deferred tax liabilities	353			325
Pension, other postretirement, and postemployment liabilities	329			361
Non-current intercompany payables	489			499
Other non-current liabilities	843			927
Total liabilities	18,311			16,160
Total Aon shareholders’ equity	29,137			27,565
Noncontrolling interests	69			68
Total equity	29,206			27,633
Total liabilities and equity	47,517			43,793
Consolidation Adjustments
Current assets
Cash and cash equivalents	(1,419)			(781)
Short-term investments	0			0
Receivables, net	0			0
Fiduciary assets	0			0
Current intercompany receivables	(17,912)			(12,722)
Other current assets	0			0
Total current assets	(19,331)			(13,503)
Goodwill	0			0
Intangible assets, net	0			0
Fixed assets, net	0			0
Operating lease right-of-use assets	0
Deferred tax assets	(145)			(144)
Prepaid pension	0			0
Non-current intercompany receivables	(7,853)			(7,889)
Other non-current assets	0			0
Investment in subsidiary	(28,412)			(26,683)
Total assets	(55,741)			(48,219)
Current liabilities
Accounts payable and accrued liabilities	(1,419)			(781)
Short-term debt and current portion of long-term debt	0			0
Fiduciary liabilities	0			0
Current intercompany payables	(17,912)			(12,722)
Other current liabilities	0			0
Total current liabilities	(19,331)			(13,503)
Long-term debt	0			0
Non-current operating lease liabilities	0
Deferred tax liabilities	(145)			(144)
Pension, other postretirement, and postemployment liabilities	0			0
Non-current intercompany payables	(7,853)			(7,889)
Other non-current liabilities	0			0
Total liabilities	(27,329)			(21,536)
Total Aon shareholders’ equity	(28,412)			(26,683)
Noncontrolling interests	0			0
Total equity	(28,412)			(26,683)
Total liabilities and equity	$ (55,741)			$ (48,219)

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Restructuring - Schedule of Restructuring Reserve (Details) - 2017 Plan - USD ($) $ in Millions	3 Months Ended	9 Months Ended	33 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2019
Restructuring Plan
Balance as of December 31, 2018		$ 201
Expensed	$ 125	260	$ 1,263
Cash payments		(322)
Foreign currency translation		(1)
Balance as of September 30, 2019		$ 138	$ 138

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Lease Commitments - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Non cash right-of-use asset lease expense	$ 87
Increase (decrease) in operating lease liabilities	$ 92

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Shareholders' Equity (Details) - USD ($)	3 Months Ended						9 Months Ended		90 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Feb. 28, 2017	Nov. 30, 2014	Apr. 30, 2012
Common Stock Programs
Total cost of shares purchased	$ 350,000,000	$ 1,056,000,000	$ 101,000,000	$ 301,000,000	$ 402,000,000	$ 553,000,000
Weighted average shares outstanding
Basic weighted average ordinary shares outstanding (in shares)	236,900,000			244,000,000.0			239,900,000	246,200,000
Dilutive effect of potentially issuable shares (in shares)	2,200,000			1,600,000			2,000,000.0	1,500,000
Diluted weighted average ordinary shares outstanding (in shares)	239,100,000			245,600,000			241,900,000	247,700,000
Number of shares excluded from the calculation of diluted earnings per share (in shares)	0			0			0	0
2012 - Share Repurchase Program
Common Stock Programs
Share repurchase authorization limit (up to)	$ 15,000,000,000.0						$ 15,000,000,000.0		$ 15,000,000,000.0	$ 5,000,000,000.0	$ 5,000,000,000.0	$ 5,000,000,000.0
Share repurchase, remaining authorization limit (in shares)	$ 2,500,000,000						$ 2,500,000,000		$ 2,500,000,000
Shares purchased (in shares)	1,800,000			2,100,000			8,200,000	8,800,000	126,500,000
Total cost of shares purchased	$ 350,000,000			$ 300,000,000			$ 1,500,000,000	$ 1,250,000,000	$ 12,500,000,000

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Discontinued Operations (Details) - Tempo Business	May 01, 2017 USD ($) agreement	Sep. 30, 2019 USD ($)
Dispositions
Number of commercial agreements | agreement	2
Discontinued Operations, Disposed of by Sale
Dispositions
Purchase price	$ 4,300,000,000
Cash and cash equivalents from discontinued operations		$ 0
Maximum | Discontinued Operations, Disposed of by Sale
Dispositions
Purchase price	4,200,000,000
Deferred consideration	$ 500,000,000

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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Financial Data [Abstract]
Cost to fulfill contracts with customers	$ 239	$ 329
Prepaid expenses	123	97
Taxes receivable	177	113
Other	92	79
Total	$ 631	618
Receivables from divested business		$ 12

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Derivatives and Hedging - Notional and fair values of derivative instruments (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value
Notional Amount	$ 920	$ 915
Derivative Assets	10	18
Derivative Liabilities	$ 2	8
Term of derivative contract	30 days
Other Current Assets
Derivatives, Fair Value
Derivative Assets	$ 3	3
Other non-current assets
Derivatives, Fair Value
Derivative Assets	7	15
Other current liabilities
Derivatives, Fair Value
Derivative Liabilities	2	5
Other non-current liabilities
Derivatives, Fair Value
Derivative Liabilities		3
Derivatives accounted for as hedges | Gross foreign exchange contracts
Derivatives, Fair Value
Notional Amount	607	646
Derivative Assets	10	17
Derivative Liabilities	1	2
Not Designated as Hedging Instrument | Gross foreign exchange contracts
Derivatives, Fair Value
Notional Amount	313	269
Derivative Assets	0	1
Derivative Liabilities	$ 1	$ 6

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Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 228	$ 287	$ 676	$ 153	$ 58	$ 610	$ 1,191	$ 821
Less: Net income attributable to noncontrolling interests	6			6			33	32
Net income attributable to Aon shareholders	222			147			1,158	789
Change in fair value of financial instruments	(2)	(8)	7	1	(1)	14	(3)	14
Foreign currency translation adjustments	(212)	(103)	133	(50)	(460)	247	(182)	(263)
Postretirement benefit obligation	17	$ 14	$ 31	(62)	$ 122	$ 48	62	108
Net current period other comprehensive income (loss)	(197)			(111)			(123)	(141)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	0			0			0	0
Less: Other comprehensive loss attributable to noncontrolling interests	(4)			(3)			(2)	(6)
Total other comprehensive loss attributable to Aon shareholders	(193)			(108)			(121)	(135)
Comprehensive income (loss) attributable to Aon shareholders	29			39			1,037	654
Aon plc
Condensed Financial Statements, Captions [Line Items]
Net income	244			145			1,175	802
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	244			145			1,175	802
Change in fair value of financial instruments	0			0			0	0
Foreign currency translation adjustments	0			0			0	0
Postretirement benefit obligation	0			0			0	0
Net current period other comprehensive income (loss)	0			0			0	0
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(215)			(106)			(138)	(148)
Less: Other comprehensive loss attributable to noncontrolling interests	0			0			0	0
Total other comprehensive loss attributable to Aon shareholders	(215)			(106)			(138)	(148)
Comprehensive income (loss) attributable to Aon shareholders	29			39			1,037	654
Aon Corporation
Condensed Financial Statements, Captions [Line Items]
Net income	(36)			(364)			504	234
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	(36)			(364)			504	234
Change in fair value of financial instruments	0			(2)			2	(3)
Foreign currency translation adjustments	0			0			0	0
Postretirement benefit obligation	10			12			42	34
Net current period other comprehensive income (loss)	10			10			44	31
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(220)			(134)			(223)	(194)
Less: Other comprehensive loss attributable to noncontrolling interests	0			0			0	0
Total other comprehensive loss attributable to Aon shareholders	(210)			(124)			(179)	(163)
Comprehensive income (loss) attributable to Aon shareholders	(246)			(488)			325	71
Other Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income	443			(78)			2,388	1,748
Less: Net income attributable to noncontrolling interests	6			6			33	32
Net income attributable to Aon shareholders	437			(84)			2,355	1,716
Change in fair value of financial instruments	(2)			3			(5)	17
Foreign currency translation adjustments	(234)			(48)			(199)	(276)
Postretirement benefit obligation	7			(74)			20	74
Net current period other comprehensive income (loss)	(229)			(119)			(184)	(185)
Equity in other comprehensive income (loss) of subsidiaries, net of tax	(210)			(124)			(179)	(163)
Less: Other comprehensive loss attributable to noncontrolling interests	(4)			(3)			(2)	(6)
Total other comprehensive loss attributable to Aon shareholders	(435)			(240)			(361)	(342)
Comprehensive income (loss) attributable to Aon shareholders	2			(324)			1,994	1,374
Consolidation Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(423)			450			(2,876)	(1,963)
Less: Net income attributable to noncontrolling interests	0			0			0	0
Net income attributable to Aon shareholders	(423)			450			(2,876)	(1,963)
Change in fair value of financial instruments	0			0			0	0
Foreign currency translation adjustments	22			(2)			17	13
Postretirement benefit obligation	0			0			0	0
Net current period other comprehensive income (loss)	22			(2)			17	13
Equity in other comprehensive income (loss) of subsidiaries, net of tax	645			364			540	505
Less: Other comprehensive loss attributable to noncontrolling interests	0			0			0	0
Total other comprehensive loss attributable to Aon shareholders	667			362			557	518
Comprehensive income (loss) attributable to Aon shareholders	$ 244			$ 812			$ (2,319)	$ (1,445)

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Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	27	24	81	74
Expected return on plan assets, net of administration expenses	(34)	(36)	(102)	(108)
Amortization of prior-service cost	1	0	2	1
Amortization of net actuarial loss	13	15	40	45
Net periodic (benefit) cost	7	3	21	12
Loss on pension settlement	0	0	0	0
Total net periodic (benefit) cost	7	3	21	12
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	26	26	81	84
Expected return on plan assets, net of administration expenses	(46)	(46)	(143)	(147)
Amortization of prior-service cost	0	1	1	1
Amortization of net actuarial loss	7	6	22	21
Net periodic (benefit) cost	(13)	(13)	(39)	(41)
Loss on pension settlement	0	9	0	32
Total net periodic (benefit) cost	(13)	(4)	(39)	(9)
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	6	6	20	20
Expected return on plan assets, net of administration expenses	(9)	(11)	(29)	(34)
Amortization of prior-service cost	0	0	0	0
Amortization of net actuarial loss	3	3	9	9
Net periodic (benefit) cost	0	(2)	0	(5)
Loss on pension settlement	0	0	0	0
Total net periodic (benefit) cost	$ 0	$ (2)	$ 0	$ (5)

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Derivatives and Hedging - Interest Rate Management Risk Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months			$ 14
Not Designated as Hedging Instrument | Gross foreign exchange contracts
Derivative [Line Items]
Derivative gain (loss)	$ (16)	$ (4)	$ (20)	$ (15)

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Claims, Lawsuits and Other Contingencies - Narrative (Details) £ in Millions, $ in Millions						3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 06, 2018 USD ($)	Oct. 03, 2017 NZD ($)	Dec. 20, 2016 GBP (£)	Jun. 29, 2015 NZD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Apr. 30, 2014 GBP (£)
Legal, Guarantees and Indemnifications
Revenue						$ 2,379,000,000	$ 2,349,000,000	$ 8,128,000,000	$ 8,000,000,000
Maximum potential funding under commitments	$ 83,000,000					83,000,000		83,000,000			$ 103,000,000
Letters of credit outstanding	71,000,000					71,000,000		71,000,000			$ 83,000,000
Potential Claim for Pension Advisory Services
Legal, Guarantees and Indemnifications
Estimate of possible loss	55,000,000					55,000,000		55,000,000				£ 45
Pending Litigation | Trustees Of Gleeds Pension Fund 2016
Legal, Guarantees and Indemnifications
Damages sought	86,000,000			£ 70
Pending Litigation | Lyttleton Port Company Limited
Legal, Guarantees and Indemnifications
Damages sought	116,000,000				$ 184
Pending Litigation | Christchurch City Council
Legal, Guarantees and Indemnifications
Damages sought	333,000,000		$ 528
Minimum
Legal, Guarantees and Indemnifications
Estimate of possible loss	0					0		0
Minimum | Pilkington North America, Inc.
Legal, Guarantees and Indemnifications
Damages sought		$ 45,000,000
Maximum
Legal, Guarantees and Indemnifications
Estimate of possible loss	100,000,000					100,000,000		100,000,000
Maximum | Pilkington North America, Inc.
Legal, Guarantees and Indemnifications
Damages sought		85,000,000
Damages awarded		$ 15,000,000
Aviation and Aerospace Broking Industry
Legal, Guarantees and Indemnifications
Revenue										$ 100,000,000
Discontinued Operations, Disposed of by Sale | Tempo Business | Property Lease Guarantee
Legal, Guarantees and Indemnifications
Maximum potential funding under commitments	74,000,000					74,000,000		74,000,000
Guarantor obligations, current carrying value	14,000,000					14,000,000		14,000,000
Loss contingency accrual payments								0
Discontinued Operations, Disposed of by Sale | Tempo Business | Performance Guarantee
Legal, Guarantees and Indemnifications
Maximum potential funding under commitments	160,000,000					160,000,000		160,000,000
Guarantor obligations, current carrying value	$ 1,000,000					1,000,000		1,000,000
Loss contingency accrual payments						$ 0		$ 0

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Share-Based Compensation Plans - Restricted share unit activity (Details) - Restricted share units (“RSUs”) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Non-vested share awards (in shares)
Non-vested at beginning of period (in shares)	4,208	4,849	4,849
Granted (in shares)	1,225	1,409
Vested (in shares)	(1,551)	(1,772)
Forfeited (in shares)	(164)	(158)
Non-vested at end of period (in shares)	3,718	4,328	4,208
Weighted Average Fair value
Non-vested at beginning of period (in dollars per share)	$ 120	$ 104	$ 104
Granted (in dollars per share)	174	140
Vested (in dollars per share)	112	97
Forfeited (in dollars per share)	128	111
Non-vested at end of period (in dollars per share)	$ 141	$ 118	$ 120
Unamortized deferred compensation expense	$ 384
Remaining weighted-average amortization period (in years)	2 years 1 month 6 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years

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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Ordinary Shares and Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss, Net of Tax	Non- controlling Interests
Beginning Balance (in shares) at Dec. 31, 2017		247.6
Beginning Balance at Dec. 31, 2017	$ 5,140	$ 5,777	$ 2,795	$ (3,497)	$ 65
Increase (Decrease) in Shareholders' Equity
Net income	610		594		16
Shares issued - employee stock compensation plans (in shares)		1.5
Shares issued - employee stock compensation plans	(109)	$ (109)
Shares purchased (in shares)		(3.9)
Shares purchased	(553)		(553)
Share-based compensation expense	77	$ 77
Dividends to shareholders	(89)		(89)
Net change in fair value of financial instruments	14			14
Net foreign currency translation adjustments	247			244	3
Net postretirement benefit obligation	48			48
Ending Balance (in shares) at Mar. 31, 2018		245.2
Ending Balance at Mar. 31, 2018	5,385	$ 5,745	2,747	(3,191)	84
Beginning Balance (in shares) at Dec. 31, 2017		247.6
Beginning Balance at Dec. 31, 2017	5,140	$ 5,777	2,795	(3,497)	65
Increase (Decrease) in Shareholders' Equity
Net income	821
Net change in fair value of financial instruments	14
Net foreign currency translation adjustments	(263)
Net postretirement benefit obligation	108
Ending Balance (in shares) at Sep. 30, 2018		241.2
Ending Balance at Sep. 30, 2018	4,328	$ 5,852	2,042	(3,632)	66
Beginning Balance (in shares) at Mar. 31, 2018		245.2
Beginning Balance at Mar. 31, 2018	5,385	$ 5,745	2,747	(3,191)	84
Increase (Decrease) in Shareholders' Equity
Net income	58		48		10
Shares issued - employee stock compensation plans (in shares)		0.6
Shares issued - employee stock compensation plans	(41)	$ (41)
Shares purchased (in shares)		(2.8)
Shares purchased	(402)		(402)
Share-based compensation expense	70	$ 70
Dividends to shareholders	(98)		(98)
Net change in fair value of financial instruments	(1)			(1)
Net foreign currency translation adjustments	(460)			(454)	(6)
Net postretirement benefit obligation	122			122
Purchases of shares from noncontrolling interests	(1)				(1)
Dividends paid to noncontrolling interests on subsidiary common stock	(14)				(14)
Ending Balance (in shares) at Jun. 30, 2018		243.0
Ending Balance at Jun. 30, 2018	4,618	$ 5,774	2,295	(3,524)	73
Increase (Decrease) in Shareholders' Equity
Net income	153		147		6
Shares issued - employee stock compensation plans (in shares)		0.3
Shares issued - employee stock compensation plans	10	$ 11	(1)
Shares purchased (in shares)		(2.1)
Shares purchased	(301)		(301)
Share-based compensation expense	67	$ 67
Dividends to shareholders	(98)		(98)
Net change in fair value of financial instruments	1			1
Net foreign currency translation adjustments	(50)			(47)	(3)
Net postretirement benefit obligation	(62)			(62)
Dividends paid to noncontrolling interests on subsidiary common stock	(10)				(10)
Ending Balance (in shares) at Sep. 30, 2018		241.2
Ending Balance at Sep. 30, 2018	$ 4,328	$ 5,852	2,042	(3,632)	66
Beginning Balance (in shares) at Dec. 31, 2018	240.1	240.1
Beginning Balance at Dec. 31, 2018	$ 4,219	$ 5,967	2,093	(3,909)	68
Increase (Decrease) in Shareholders' Equity
Net income	676		659		17
Shares issued - employee stock compensation plans (in shares)		1.4
Shares issued - employee stock compensation plans	(96)	$ (96)
Shares purchased (in shares)		(0.6)
Shares purchased	(101)		(101)
Share-based compensation expense	89	$ 89
Dividends to shareholders	(96)		(96)
Net change in fair value of financial instruments	7			7
Net foreign currency translation adjustments	133			131	2
Net postretirement benefit obligation	31			31
Ending Balance (in shares) at Mar. 31, 2019		240.9
Ending Balance at Mar. 31, 2019	$ 4,862	$ 5,960	2,555	(3,740)	87
Beginning Balance (in shares) at Dec. 31, 2018	240.1	240.1
Beginning Balance at Dec. 31, 2018	$ 4,219	$ 5,967	2,093	(3,909)	68
Increase (Decrease) in Shareholders' Equity
Net income	1,191
Net change in fair value of financial instruments	(3)
Net foreign currency translation adjustments	(182)
Net postretirement benefit obligation	$ 62
Ending Balance (in shares) at Sep. 30, 2019	234.1	234.1
Ending Balance at Sep. 30, 2019	$ 3,561	$ 6,086	1,436	(4,030)	69
Beginning Balance (in shares) at Mar. 31, 2019		240.9
Beginning Balance at Mar. 31, 2019	4,862	$ 5,960	2,555	(3,740)	87
Increase (Decrease) in Shareholders' Equity
Net income	287		277		10
Shares issued - employee stock compensation plans (in shares)		0.6
Shares issued - employee stock compensation plans	(47)	$ (47)
Shares purchased (in shares)		(5.8)
Shares purchased	(1,056)		(1,056)
Share-based compensation expense	91	$ 91
Dividends to shareholders	(107)		(107)
Net change in fair value of financial instruments	(8)			(8)
Net foreign currency translation adjustments	(103)			(103)
Net postretirement benefit obligation	14			14
Dividends paid to noncontrolling interests on subsidiary common stock	(20)				(20)
Ending Balance (in shares) at Jun. 30, 2019		235.7
Ending Balance at Jun. 30, 2019	3,913	$ 6,004	1,669	(3,837)	77
Increase (Decrease) in Shareholders' Equity
Net income	228		222		6
Shares issued - employee stock compensation plans (in shares)		0.2
Shares issued - employee stock compensation plans	9	$ 10	(1)
Shares purchased (in shares)		(1.8)
Shares purchased	(350)		(350)
Share-based compensation expense	72	$ 72
Dividends to shareholders	(104)		(104)
Net change in fair value of financial instruments	(2)			(2)
Net foreign currency translation adjustments	(212)			(208)	(4)
Net postretirement benefit obligation	17			17
Dividends paid to noncontrolling interests on subsidiary common stock	$ (10)				(10)
Ending Balance (in shares) at Sep. 30, 2019	234.1	234.1
Ending Balance at Sep. 30, 2019	$ 3,561	$ 6,086	$ 1,436	$ (4,030)	$ 69

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Discontinued Operations

9 Months Ended

Sep. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

On February 9, 2017, the Company entered into a Purchase Agreement with Tempo Acquisition, LLC (the “Purchase Agreement”) to sell its benefits administration and business process outsourcing business (the “Divested Business”) to an entity formed and controlled by affiliates of The Blackstone Group L.P. (the “Buyer”) and certain designated purchasers that are direct or indirect subsidiaries of the Buyer.

On May 1, 2017, the Buyer purchased all of the outstanding equity interests of the Divested Business, plus certain related assets and liabilities, for a purchase price of $4.3 billion in cash paid at closing, subject to customary adjustments set forth in the Purchase Agreement, and deferred consideration of up to $500 million (the “Transaction”). Cash proceeds after customary adjustments and before taxes due were $4.2 billion.

Aon and the Buyer entered into certain transaction-related agreements at the closing, including two commercial agreements, a transition services agreement, certain intellectual property license agreements, subleases, and other customary agreements. Aon expects to continue to be a significant client of the Divested Business and the Divested Business has agreed to use Aon for its broking and other services for a specified period of time.

The financial results of the Divested Business for the three and nine months ended September 30, 2019 and 2018 are presented as Net income (loss) from discontinued operations on the Company’s Condensed Consolidated Statements of Income. The following table presents the financial results of the Divested Business (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Expenses
Total operating expenses	$	1		$	4		$	2		$	7
Loss from discontinued operations before income taxes	(1		)	(4		)	(2		)	(7		)
Income tax benefit	—			(2		)	(1		)	(3		)
Net loss from discontinued operations excluding gain	(1		)	(2		)	(1		)	(4		)
Gain on sale of discontinued operations, net of tax	—			—			—			9
Net income (loss) from discontinued operations	$	(1	)	$	(2	)	$	(1	)	$	5

There were no cash or cash equivalents of discontinued operations at September 30, 2019.

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Accounting Principles and Practices

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Accounting Principles and Practices

Accounting Principles and Practices

Adoption of New Accounting Standards

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the Financial Accounting Standards Board (“FASB”) issued new accounting guidance related to reclassification of certain tax effects from accumulated other comprehensive income. The guidance allowed a reclassification from accumulated comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The guidance was effective for the Company in the first quarter of 2019. For the three and nine months ended September 30, 2019, there was no impact on the net income of the Company as Aon did not elect to reclassify stranded tax effects on the Condensed Consolidated Statement of Financial Position. It is the Company’s policy to release income tax effects from accumulated other comprehensive loss using the portfolio approach.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued new accounting guidance on targeted improvements to accounting for hedging activities. The new guidance amended its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The guidance eliminated the requirement to separately measure and report hedge ineffectiveness and required the effect of a hedging instrument to be presented in the same income statement line as the hedged item. The new guidance was effective for Aon in the first quarter of 2019 and the Company adopted it on a modified retrospective basis with no cumulative effect adjustment to accumulated other comprehensive income or corresponding adjustment to Retained earnings. Changes to the Condensed Consolidated Statement of Income and financial statement disclosures were applied prospectively. Under the new guidance, gains or losses on certain derivative hedging instruments are recognized in Revenue, as opposed to Other income (expense) under the previous guidance. For the three and nine months ended September 30, 2019, the adoption of this guidance had no impact on the net income and an insignificant impact on the operating income of the Company.

Leases

In February 2016, the FASB issued a new accounting standard on leases, which requires lessees to recognize assets and liabilities for most leases. Under the new standard, a lessee is required to recognize in the Consolidated Statements of Financial Position, liabilities to make future lease payments and right-of-use (“ROU”) assets representing its right to use the underlying assets for the lease term. The recognition, measurement, timing, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous U.S. GAAP.

The Company adopted the new standard as of January 1, 2019, using the modified retrospective approach for all leases existing at, or entered into after, the period of adoption. Under this approach, prior periods were not restated. Rather, lease balances and other disclosures for prior periods were provided in the notes to the financial statements as previously reported, and the cumulative effect of initially applying the guidance was recognized in the Condensed Consolidated Statement of Financial Position as of September 30, 2019.

The modified retrospective approach includes several optional practical expedients available that entities may elect to apply upon transition. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. The Company elected the package of practical expedients permitted under the transition guidance within the new standard, which allows a lessee to carryforward their population of existing leases, the classification of each lease, as well as the treatment of initial direct costs as of the period of adoption. In addition, the Company elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration paid in a contract as a single lease component. Lastly, the Company did not elect the practical expedient related to hindsight analysis which allows a lessee to use hindsight in determining the lease term and in assessing impairment of the entity’s ROU assets.

The Company has made a policy election to not recognize ROU assets and lease liabilities that arise from leases with an initial term of twelve months or less on the Condensed Consolidated Statements of Financial Position. However, the Company will recognize these lease payments in the Condensed Consolidated Statements of Income on a straight-line basis over the lease term and variable lease payments in the period in which the obligation is incurred. The Company has chosen to apply this accounting policy across all classes of underlying assets. Additionally, upon adoption, the Company utilized a discount rate to determine the present value of the lease payments based on information available as of January 1, 2019.

Beginning January 1, 2019, operating ROU assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the commencement date. Operating leases in effect prior to January 1, 2019 were recognized at the present value of the remaining payments on the remaining lease term as of January 1, 2019. Upon adoption, the Company recognized ROU assets and lease liabilities of $1.1 billion and $1.3 billion, respectively. The standard had an insignificant impact on the Condensed Consolidated Statements of Income and no impact on the Condensed Consolidated Statements of Cash Flows. Refer to Note 20 “Lease Commitments” for further information including significant assumptions and judgments made.

As a result of applying the modified retrospective approach to adopt the new leasing standard, the following adjustments were made to the Condensed Consolidated Statement of Financial Position as of January 1, 2019 (in millions):

	December 31, 2018					January 1, 2019
	As Reported		Adjustments			As Adjusted
Assets
Operating lease right-of-use assets	$	—	$	1,021		$	1,021
Other non-current assets	$	448	$	78		$	526
Liabilities
Other current liabilities	$	936	$	219		$	1,155
Non-current operating lease liabilities	$	—	$	1,014		$	1,014
Other non-current liabilities	$	1,097	$	(134	)	$	963

Accounting Standards Issued But Not Yet Adopted

Cloud Computing Arrangements

In August 2018, the FASB issued new accounting guidance on implementation costs incurred in a cloud computing arrangement that is a service contract. The new guidance aligns capitalization requirements for certain implementation costs incurred in cloud computing arrangements with existing requirements for capitalizing implementation costs for internal-use software. These costs will be deferred over the term of the hosting arrangement, including any optional renewal periods the entity is reasonably certain to exercise. An entity may apply the new guidance on either a prospective or retrospective basis. The new guidance is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting guidance in the first quarter of 2020 on a prospective basis for all implementation costs incurred after the date of initial adoption.

Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued new accounting guidance related to the disclosure requirements for employers that sponsor defined benefit pension and other postretirement benefit plans. The guidance requires sponsors of these plans to provide additional disclosures, including weighted average interest rates used in the entity’s cash balance pension plans and a narrative description of reasons for any significant gains or losses impacting the benefit obligation for the period, and eliminates certain previous disclosure requirements. The new guidance is effective for Aon in the first quarter of 2021 with early adoption permitted and will be applied retrospectively. The Company is currently evaluating the impact that the guidance will have on the Financial Statements and the period of adoption.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued new accounting guidance on simplifying the test for goodwill impairment. Currently the standard requires an entity to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. The new guidance removes Step 2. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. An entity will apply the new guidance on a prospective basis. The new guidance is effective for Aon in the first quarter of 2020 and early adoption is permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new guidance in the first quarter of 2020.

Credit Losses

In June 2016, the FASB issued a new accounting standard on the measurement of credit losses on financial instruments. The new standard replaces the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. An entity will apply the new standard through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the standard is effective. The new standard is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting standard in the first quarter of 2020.

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Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue
Total revenue	$ 2,379	$ 2,349	$ 8,128	$ 8,000
Expenses
Compensation and benefits	1,368	1,392	4,453	4,502
Information technology	120	125	363	363
Premises	76	94	248	283
Depreciation of fixed assets	44	40	124	126
Amortization and impairment of intangible assets	101	100	295	492
Other general expenses	310	336	1,000	1,189
Total operating expenses	2,019	2,087	6,483	6,955
Operating income (loss)	360	262	1,645	1,045
Interest income	1	0	4	5
Interest expense	(78)	(69)	(227)	(208)
Other income (expense)	2	1	8	(17)
Income (loss) from continuing operations before income taxes	285	194	1,430	825
Income tax expense (benefit)	56	39	238	9
Net income from continuing operations	229	155	1,192	816
Net income (loss) from discontinued operations	(1)	(2)	(1)	5
Net income	228	153	1,191	821
Less: Net income attributable to noncontrolling interests	6	6	33	32
Net income attributable to Aon shareholders	$ 222	$ 147	$ 1,158	$ 789
Basic net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	$ 0.94	$ 0.61	$ 4.83	$ 3.18
Discontinued operations (in dollars per share)	0	(0.01)	0	0.02
Net income (in dollars per share)	0.94	0.60	4.83	3.20
Diluted net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	0.93	0.61	4.79	3.17
Discontinued operations (in dollars per share)	0	(0.01)	0	0.02
Net income (in dollars per share)	$ 0.93	$ 0.60	$ 4.79	$ 3.19
Weighted average ordinary shares outstanding - basic (in shares)	236.9	244.0	239.9	246.2
Weighted average ordinary shares outstanding - diluted (in shares)	239.1	245.6	241.9	247.7

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Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

Debt

Notes

In September 2019, the Company’s $600 million 5.00% Senior Notes due September 2020 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statement of Financial Position as the date of maturity is in less than one year.

On May 2, 2019, Aon Corporation issued $750 million 3.75% Senior Notes due May 2029. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

On December 3, 2018, Aon Corporation issued $350 million 4.50% Senior Notes due December 2028. The Company used the net proceeds of the offering to pay down a portion of outstanding commercial paper and for general corporate purposes.

On March 8, 2018, the Company’s CAD 375 million ($291 million at March 8, 2018 exchange rates) 4.76% Senior Note due March 2018 issued by a Canadian subsidiary of Aon Corporation matured and was repaid in full.

Revolving Credit Facilities

As of September 30, 2019, Aon plc had two primary committed credit facilities outstanding: its $900 million multi-currency U.S. credit facility expiring in February 2022 and its $400 million multi-currency U.S. credit facility expiring in October 2022 (collectively, the “2022 Facilities”). On October 19, 2019, the Company extended the $400 million multi-currency U.S. credit facility expiring in October 2022 by one year, and it will now expire in October 2023.

Each of these facilities includes customary representations, warranties and covenants, including financial covenants that require Aon to maintain specified ratios of adjusted consolidated earnings before interest, taxes, depreciation, and amortization (“EBITDA”) to consolidated interest expense and consolidated debt to adjusted consolidated EBITDA, in each case, tested quarterly. At September 30, 2019, Aon did not have borrowings under the 2022 Facilities, and was in compliance with the financial covenants and all other covenants contained therein during the rolling twelve months ended September 30, 2019.

Commercial Paper

Aon Corporation, a wholly owned subsidiary of Aon plc, has established a U.S. commercial paper program and Aon plc has established a European multi-currency commercial paper program. Commercial paper may be issued in aggregate principal amounts of up to $600 million under the U.S. program and €525 million under the European program, not to exceed the amount of the Company’s committed credit, which was $1.3 billion at September 30, 2019. The U.S. commercial paper program is fully and unconditionally guaranteed by Aon plc and the European multi-currency commercial paper program is fully and unconditionally guaranteed by Aon Corporation.

Commercial paper outstanding, which is included in Short-term debt and current portion of long-term debt in the Company’s Condensed Consolidated Statements of Financial Position, is as follows (in millions):

As of	September 30, 2019		December 31, 2018
Commercial paper outstanding	$	546	$	250

The weighted average commercial paper outstanding and its related interest rates are as follows (in millions, except percentages):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019		2018
Weighted average commercial paper outstanding	$	656		$	820		541		$	566
Weighted average interest rate of commercial paper outstanding	0.15		%	0.79		%	0.43	%	0.83		%

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Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

The following table presents the financial results of the Divested Business (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Expenses
Total operating expenses	$	1		$	4		$	2		$	7
Loss from discontinued operations before income taxes	(1		)	(4		)	(2		)	(7		)
Income tax benefit	—			(2		)	(1		)	(3		)
Net loss from discontinued operations excluding gain	(1		)	(2		)	(1		)	(4		)
Gain on sale of discontinued operations, net of tax	—			—			—			9
Net income (loss) from discontinued operations	$	(1	)	$	(2	)	$	(1	)	$	5

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Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The weighted average commercial paper outstanding and its related interest rates are as follows (in millions, except percentages):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019		2018
Weighted average commercial paper outstanding	$	656		$	820		541		$	566
Weighted average interest rate of commercial paper outstanding	0.15		%	0.79		%	0.43	%	0.83		%

Commercial paper outstanding, which is included in Short-term debt and current portion of long-term debt in the Company’s Condensed Consolidated Statements of Financial Position, is as follows (in millions):

As of	September 30, 2019		December 31, 2018
Commercial paper outstanding	$	546	$	250

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Lease Commitments

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Lease Commitments

Lease Commitments

The Company leases office facilities, equipment, and automobiles under non-cancelable operating and finance leases. The Company’s lease obligations are primarily for the use of office space. The Company evaluates if a leasing arrangement exists upon inception of a contract. A contract contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. Identified property, plant, or equipment may include a physically distinct portion of a larger asset, or a portion of an asset that represents substantially all of the capacity of the asset but is not physically distinct. The Company assesses whether a contract implicitly contains the right to control the use of a tangible asset that is not already owned. In addition, the Company subleases certain real estate properties to third parties, which consist of operating leases.

The Company’s leases expire at various dates and may contain renewal and expansion options. The exercise of lease renewal and expansion options are at the Company’s sole discretion and are only included in the determination of the lease term if the Company is reasonably certain to exercise the option. The Company’s leases do not typically contain termination options. In addition, the Company’s lease agreements typically do not contain any material residual value guarantees or restrictive covenants.

ROU assets and lease liabilities are based on the present value of the minimum lease payments over the lease term. As stated in Note 2 “Accounting Principles and Practices”, the Company has elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration received in a contract as a single lease component.

A portion of the Company’s lease agreements include variable lease payments that are not recorded in the initial measurement of the lease liability and ROU asset balances. For real estate arrangements, base rental payments may be escalated according to annual changes in the Consumer Price Index (“CPI”) or other indices. The escalated rental payments based on the estimated CPI at the lease commencement date are included within minimum rental payments; however, changes in CPI are considered variable in nature and are recognized as variable lease costs in the period in which the obligation is incurred. Additionally, real estate lease agreements may include other variable payments related to operating expenses charged by the landlord based on actual expenditures. Information technology equipment agreements may include variable payments based on usage of the equipment.

The Company utilizes discount rates to determine the present value of the lease payments based on information available at the commencement date of the lease. The Company uses an incremental borrowing rate based on factors such as the lease term and the economic environment where the lease exists to determine the appropriate present value of future lease payments as the rate implicit in the lease is not always readily available. When determining the incremental borrowing rate, the Company considers the rate of interest it would pay on a secured borrowing in an amount equal to the lease payments for the underlying asset under similar terms.

Operating leases are included in Operating lease right-of-use assets, Other current liabilities, and Non-current operating lease liabilities on the Condensed Consolidated Statements of Financial Position. Finance leases are included in Other non-current assets, Other current liabilities, and Other non-current liabilities on the Condensed Consolidated Statements of Financial Position.

The classification of operating and finance lease asset and liability balances within the Condensed Consolidated Statements of Financial Position is as follows (in millions):

As of		September 30, 2019
Assets
Operating lease assets	Operating lease right-of-use assets	$	913
Finance lease assets	Other non-current assets	106
Total lease assets		$	1,019
Liabilities
Current lease liabilities
Operating	Other current liabilities	$	194
Finance	Other current liabilities	24
Non-current lease liabilities
Operating	Non-current operating lease liabilities	922
Finance	Other non-current liabilities	82
Total lease liabilities		$	1,222

The components of lease costs are as follows (in millions):

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
Operating lease cost	$	43		$	176
Finance lease costs
Amortization of leased assets	7			20
Interest on lease liabilities	—			1
Variable lease cost	31			49
Short-term lease cost (1)	1			3
Sublease income	(8		)	(24		)
Net lease cost	$	74		$	225

(1) Short-term lease cost does not include expenses related to leases with a lease term of one month or less.

Weighted average remaining lease term and discount rate related to operating and finance leases are as follows:

As of	September 30, 2019
Weighted average remaining lease term (years)
Operating leases	8.0
Finance leases	4.6
Weighted average discount rate
Operating leases	3.3	%
Finance leases	2.0	%

Other cash and non-cash related activities are as follows (in millions):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	182
Financing cash flows from finance leases	$	11
Non-cash related activities
ROU assets obtained in exchange for new operating lease liabilities	$	95
ROU assets obtained in exchange for new finance lease liabilities	$	48

The Company has recorded non-cash changes in Operating lease ROU assets and Non-current operating lease liabilities through Other assets and liabilities in Cash flows from operations within the Condensed Consolidated Statements of Cash Flows. Non-cash operating ROU asset lease expense was $87 million and the change in Non-current operating lease liabilities was a decrease of $92 million for the nine months ended September 30, 2019.

Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438

Lease Commitments

Lease Commitments

The Company leases office facilities, equipment, and automobiles under non-cancelable operating and finance leases. The Company’s lease obligations are primarily for the use of office space. The Company evaluates if a leasing arrangement exists upon inception of a contract. A contract contains a lease if the contract conveys the right to control the use of identified property, plant, or equipment for a period of time in exchange for consideration. Identified property, plant, or equipment may include a physically distinct portion of a larger asset, or a portion of an asset that represents substantially all of the capacity of the asset but is not physically distinct. The Company assesses whether a contract implicitly contains the right to control the use of a tangible asset that is not already owned. In addition, the Company subleases certain real estate properties to third parties, which consist of operating leases.

The Company’s leases expire at various dates and may contain renewal and expansion options. The exercise of lease renewal and expansion options are at the Company’s sole discretion and are only included in the determination of the lease term if the Company is reasonably certain to exercise the option. The Company’s leases do not typically contain termination options. In addition, the Company’s lease agreements typically do not contain any material residual value guarantees or restrictive covenants.

ROU assets and lease liabilities are based on the present value of the minimum lease payments over the lease term. As stated in Note 2 “Accounting Principles and Practices”, the Company has elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration received in a contract as a single lease component.

A portion of the Company’s lease agreements include variable lease payments that are not recorded in the initial measurement of the lease liability and ROU asset balances. For real estate arrangements, base rental payments may be escalated according to annual changes in the Consumer Price Index (“CPI”) or other indices. The escalated rental payments based on the estimated CPI at the lease commencement date are included within minimum rental payments; however, changes in CPI are considered variable in nature and are recognized as variable lease costs in the period in which the obligation is incurred. Additionally, real estate lease agreements may include other variable payments related to operating expenses charged by the landlord based on actual expenditures. Information technology equipment agreements may include variable payments based on usage of the equipment.

The Company utilizes discount rates to determine the present value of the lease payments based on information available at the commencement date of the lease. The Company uses an incremental borrowing rate based on factors such as the lease term and the economic environment where the lease exists to determine the appropriate present value of future lease payments as the rate implicit in the lease is not always readily available. When determining the incremental borrowing rate, the Company considers the rate of interest it would pay on a secured borrowing in an amount equal to the lease payments for the underlying asset under similar terms.

Operating leases are included in Operating lease right-of-use assets, Other current liabilities, and Non-current operating lease liabilities on the Condensed Consolidated Statements of Financial Position. Finance leases are included in Other non-current assets, Other current liabilities, and Other non-current liabilities on the Condensed Consolidated Statements of Financial Position.

The classification of operating and finance lease asset and liability balances within the Condensed Consolidated Statements of Financial Position is as follows (in millions):

As of		September 30, 2019
Assets
Operating lease assets	Operating lease right-of-use assets	$	913
Finance lease assets	Other non-current assets	106
Total lease assets		$	1,019
Liabilities
Current lease liabilities
Operating	Other current liabilities	$	194
Finance	Other current liabilities	24
Non-current lease liabilities
Operating	Non-current operating lease liabilities	922
Finance	Other non-current liabilities	82
Total lease liabilities		$	1,222

The components of lease costs are as follows (in millions):

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
Operating lease cost	$	43		$	176
Finance lease costs
Amortization of leased assets	7			20
Interest on lease liabilities	—			1
Variable lease cost	31			49
Short-term lease cost (1)	1			3
Sublease income	(8		)	(24		)
Net lease cost	$	74		$	225

(1) Short-term lease cost does not include expenses related to leases with a lease term of one month or less.

Weighted average remaining lease term and discount rate related to operating and finance leases are as follows:

As of	September 30, 2019
Weighted average remaining lease term (years)
Operating leases	8.0
Finance leases	4.6
Weighted average discount rate
Operating leases	3.3	%
Finance leases	2.0	%

Other cash and non-cash related activities are as follows (in millions):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	182
Financing cash flows from finance leases	$	11
Non-cash related activities
ROU assets obtained in exchange for new operating lease liabilities	$	95
ROU assets obtained in exchange for new finance lease liabilities	$	48

The Company has recorded non-cash changes in Operating lease ROU assets and Non-current operating lease liabilities through Other assets and liabilities in Cash flows from operations within the Condensed Consolidated Statements of Cash Flows. Non-cash operating ROU asset lease expense was $87 million and the change in Non-current operating lease liabilities was a decrease of $92 million for the nine months ended September 30, 2019.

Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438

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Fair Value Measurements and Financial Instruments

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements and Financial Instruments

Fair Value Measurements and Financial Instruments

Accounting standards establish a three tier fair value hierarchy that prioritizes the inputs used in measuring fair values as follows:

• Level 1 — observable inputs such as quoted prices for identical assets in active markets;

• Level 2 — inputs other than quoted prices for identical assets in active markets, that are observable either directly or indirectly; and

• Level 3 — unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.

The following methods and assumptions are used to estimate the fair values of the Company’s financial instruments:

Money market funds consist of institutional prime, treasury, and government money market funds. The Company reviews treasury and government money market funds to obtain reasonable assurance that the fund net asset value is $1 per share, and reviews the floating net asset value of institutional prime money market funds for reasonableness. 

Equity investments consist of domestic and international equity securities and equity derivatives valued using the closing stock price on a national securities exchange. Over the counter equity derivatives are valued using observable inputs such as underlying prices of the underlying security and volatility. On a sample basis the Company reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and independently verifies the observable inputs for Level 2 equity derivatives and securities.

Fixed income investments consist of certain categories of bonds and derivatives. Corporate, government, and agency bonds are valued by pricing vendors who estimate fair value using recently executed transactions and proprietary models based on observable inputs, such as interest rate spreads, yield curves, and credit risk. Asset-backed securities are valued by pricing vendors who estimate fair value using discounted cash flow models utilizing observable inputs based on trade and quote activity of securities with similar features. Fixed income derivatives are valued by pricing vendors using observable inputs such as interest rates and yield curves. The Company obtains an understanding of the models, inputs, and assumptions used in developing prices provided by its vendors through discussions with the fund managers. The Company independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and historically are not material to the fair value estimates used in the Financial Statements.

Derivatives are carried at fair value, based upon industry standard valuation techniques that use, where possible, current market-based or independently sourced pricing inputs, such as interest rates, currency exchange rates, or implied volatilities.

Debt is carried at outstanding principal balance, less any unamortized issuance costs, discount or premium. Fair value is based on quoted market prices or estimates using discounted cash flow analyses based on current borrowing rates for similar types of borrowing arrangements.

The following tables present the categorization of the Company’s assets and liabilities that are measured at fair value on a recurring basis at September 30, 2019 and December 31, 2018 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,851	$	1,851	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	1	$	—	$	1	$	—
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—
Liabilities
Derivatives (2)
Gross foreign exchange contracts	$	3	$	—	$	3	$	—

			Fair Value Measurements Using
	Balance at December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Money market funds (1)	$	1,759	$	1,759	$	—	$	—
Other investments
Government bonds	$	1	$	—	$	1	$	—
Equity investments	$	2	$	—	$	2	$	—
Derivatives (2)
Gross foreign exchange contracts	$	21	$	—	$	21	$	—
Liabilities					0
Derivatives (2)
Gross foreign exchange contracts	$	12	$	—	$	12	$	—

(1) Included within Fiduciary assets or Short-term investments in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. 

(2) Refer to Note 15 “Derivatives and Hedging” for additional information regarding the Company’s derivatives and hedging activity. 

There were no transfers of assets or liabilities between fair value hierarchy levels in either the nine months ended September 30, 2019 or 2018. The Company recognized no realized or unrealized gains or losses in the Condensed Consolidated Statements of Income during either the nine months ended September 30, 2019 or 2018, related to assets and liabilities measured at fair value using unobservable inputs.

The fair value of debt is classified as Level 2 of the fair value hierarchy. The following table provides the carrying value and fair value for the Company’s term debt (in millions):

	September 30, 2019				December 31, 2018
	Carrying Value		Fair Value		Carrying Value		Fair Value
Current portion of long-term debt	$	599	$	617	$	—	$	—
Long-term debt	$	6,120	$	6,915	$	5,993	$	6,159

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Shareholders' Equity

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

Ordinary Shares

Aon has a share repurchase program authorized by the Company’s Board of Directors (the “Repurchase Program”). The Repurchase Program was established in April 2012 with $5.0 billion in authorized repurchases, and was increased by $5.0 billion in authorized repurchases in each of November 2014 and February 2017 for a total of $15.0 billion in repurchase authorizations.

Under the Repurchase Program, Class A Ordinary Shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital.

The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):

	Three Months Ended September 30				Nine Months Ended September 30
	2019 (1)		2018		2019 (1)		2018
Shares repurchased	1.8		2.1		8.2		8.8
Average price per share	$	190.83	$	145.71	$	183.26	$	142.15
Costs recorded to retained earnings
Total repurchase cost	$	350	$	300	$	1,500	$	1,250
Additional associated costs	—		1		7		6
Total costs recorded to retained earnings	$	350	$	301	$	1,507	$	1,256

(1) Included in the 1.8 million and 8.2 million shares repurchased during the three and nine months ended September 30, 2019, respectively, were 25 thousand shares that did not settle until October 2019. These shares were settled at an average price per share of $193.91 and total cost of $4.8 million.

At September 30, 2019, the remaining authorized amount for share repurchase under the Repurchase Program was $2.5 billion. Under the Repurchase Program, the Company has repurchased a total of 126.5 million shares for an aggregate cost of approximately $12.5 billion.

Net Income Per Share

Weighted average ordinary shares outstanding are as follows (in millions):

	Three Months Ended September 30		Nine Months Ended September 30
	2019	2018	2019	2018
Basic weighted average ordinary shares outstanding	236.9	244.0	239.9	246.2
Dilutive effect of potentially issuable shares	2.2	1.6	2.0	1.5
Diluted weighted average ordinary shares outstanding	239.1	245.6	241.9	247.7

Potentially issuable shares are not included in the computation of diluted net income per share if their inclusion would be antidilutive. There were no shares excluded from the calculation for the three and nine months ended September 30, 2019 or September 30, 2018.

Accumulated Other Comprehensive Loss

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Financial Instruments (1)			Foreign Currency Translation Adjustments			Postretirement Benefit Obligation (2)			Total
Balance at December 31, 2018	$	(15	)	$	(1,319	)	$	(2,575	)	$	(3,909	)
Other comprehensive income (loss) before reclassifications, net	(12		)	(180		)	2			(190		)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income	12			—			79			91
Tax expense	(3		)	—			(19		)	(22		)
Amounts reclassified from accumulated other comprehensive income, net	9			—			60			69
Net current period other comprehensive income (loss)	(3		)	(180		)	62			(121		)
Balance at September 30, 2019	$	(18	)	$	(1,499	)	$	(2,513	)	$	(4,030	)

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Revenue, Interest expense, and Compensation and benefits in the accompanying Condensed Consolidated Statements of Income. Refer to Note 15 “Derivatives and Hedging” for further information regarding the Company’s derivative and hedging activity.

(2)

Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense).

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Debt - Schedule of Commercial Paper (Details) - Commercial paper - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Commercial paper outstanding	$ 546		$ 546		$ 250
Weighted average commercial paper outstanding	$ 656	$ 820	$ 541	$ 566
Weighted average interest rate of commercial paper outstanding	0.15%	0.79%	0.43%	0.83%

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Lease Commitments - Lease Maturity (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2019	$ 61
2020	246
2021	225
2022	199
2023	144
Thereafter	513
Total undiscounted future minimum lease payments	1,388
Imputed interest	(143)
Present value of lease liabilities	1,245
Finance Lease, Liability, Payment, Due [Abstract]
Remainder of 2019	7
2020	26
2021	26
2022	19
2023	18
Thereafter	15
Total undiscounted future minimum lease payments	111
Imputed interest	(5)
Present value of lease liabilities	106
Rentals from subleases
Remainder of 2019	(9)
2020	(34)
2021	(33)
2022	(33)
2023	(14)
Thereafter	(6)
Total undiscounted future minimum lease payments	(129)
Imputed interest	0
Present value of lease liabilities	(129)
Total
Remainder of 2019	59
2020	238
2021	218
2022	185
2023	148
Thereafter	522
Total undiscounted future minimum lease payments	1,370
Imputed interest	(148)
Present value of lease liabilities	$ 1,222

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Lease Commitments - Assets and Liabilities of Lessee (Details) $ in Millions	Sep. 30, 2019 USD ($)
Assets
Operating lease right-of-use assets	$ 913
Finance lease assets	106
Total lease assets	1,019
Current lease liabilities
Operating	194
Finance	24
Non-current lease liabilities
Operating	922
Finance	82
Total lease liabilities	$ 1,222

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Acquisitions and Dispositions of Businesses - Dispositions (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) disposal	Sep. 30, 2018 USD ($) disposal	Sep. 30, 2019 USD ($) disposal	Sep. 30, 2018 USD ($) disposal
Dispositions
Pretax gains (losses) recognized on disposal of businesses | $	$ 1	$ (3)	$ 8	$ (4)
Disposal Group, Not Discontinued Operations
Dispositions
Number of dispositions | disposal	2	2	6	3

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Derivatives and Hedging (Tables)

9 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional and fair values of derivative instruments

The notional and fair values of derivative instruments are as follows (in millions):

	Notional Amount				Net Amount of Derivative Assets  Presented in the Statements of Financial Position (1)				Net Amount of Derivative Liabilities  Presented in the Statements of Financial Position (2)
	September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018		September 30, 2019		December 31, 2018
Foreign exchange contracts
Accounted for as hedges	$	607	$	646	$	10	$	17	$	1	$	2
Not accounted for as hedges (3)	313		269		—		1		1		6
Total	$	920	$	915	$	10	$	18	$	2	$	8

(1) Included within Other current assets ($3 million at September 30, 2019 and $3 million at December 31, 2018) or Other non-current assets ($7 million at September 30, 2019 and $15 million at December 31, 2018).

(2) Included within Other current liabilities ($2 million at September 30, 2019 and $5 million at December 31, 2018) or Other non-current liabilities ($3 million at December 31, 2018).

(3) These contracts typically are for 30 day durations and executed close to the last day of the most recent reporting month, thereby resulting in nominal fair values at the balance sheet date.

Derivative gains (losses)

The amounts of derivative gains (losses) recognized in the Financial Statements are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Loss recognized in Accumulated other comprehensive loss	$	(6	)	$	(3	)	$	(14	)	$	(14	)

The amounts of derivative gains (losses) reclassified from Accumulated other comprehensive loss into the Condensed Consolidated Statements of Income are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Total revenue (1)	$	(4	)	$	—		$	(11	)	$	—
Compensation and benefits	—			—			—			1
Other general expense	—			—			—			(2		)
Interest expense	—			—			(1		)	(1		)
Other income (expense) (1)	—			(3		)	—			(7		)
Total	$	(4	)	$	(3	)	$	(12	)	$	(9	)

(1)

With the adoption of new hedge accounting guidance in the first quarter of 2019, gains (losses) on derivatives accounted for as hedges are recognized in Total revenue in the Company’s Condensed Consolidated Statements of Income rather than Other income (expense). Refer to Note 2 “Accounting Principles and Practices” for additional details.

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Accounting Principles and Practices - (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 913
Present value of lease liabilities	$ 1,245
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 1,100
Present value of lease liabilities		$ 1,300

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Cash and Cash Equivalents and Short-term Investments (Details) £ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 GBP (£)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Cash and cash equivalents and short-term investments			$ 779.0	$ 828.0
Cash and cash equivalents and short term investments, period increase (decrease)	$ (49.0)
Restricted cash and investments			96.0	91.0
Operating funds in U.K.		£ 42.7	$ 52.6	$ 53.9

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Employee Benefits - Summary of Employer Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 29	$ 138	$ 108	$ 222
U.S.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	7	108	30	133
U.K.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	19	27	65	75
Other
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 3	3	$ 13	14
Qualified Plan [Member] | U.S.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans		$ 100		$ 100

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Fair Value Measurements and Financial Instruments - Schedule of assets and liabilities that are measured at fair value on a recurring basis (Details) - Recurring - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Money market funds and highly liquid debt securities
Assets
Money market funds and highly liquid debt securities	$ 1,851	$ 1,759
Government bonds
Assets
Other investments	1	1
Equity investments
Assets
Other investments	1	2
Gross foreign exchange contracts
Assets
Derivatives	12	21
Liabilities
Derivatives	3	12
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds and highly liquid debt securities
Assets
Money market funds and highly liquid debt securities	1,851	1,759
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government bonds
Assets
Other investments	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investments
Assets
Other investments	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Gross foreign exchange contracts
Assets
Derivatives	0	0
Liabilities
Derivatives	0	0
Significant Other Observable Inputs (Level 2) | Money market funds and highly liquid debt securities
Assets
Money market funds and highly liquid debt securities	0	0
Significant Other Observable Inputs (Level 2) | Government bonds
Assets
Other investments	1	1
Significant Other Observable Inputs (Level 2) | Equity investments
Assets
Other investments	1	2
Significant Other Observable Inputs (Level 2) | Gross foreign exchange contracts
Assets
Derivatives	12	21
Liabilities
Derivatives	3	12
Significant Unobservable Inputs (Level 3) | Money market funds and highly liquid debt securities
Assets
Money market funds and highly liquid debt securities	0	0
Significant Unobservable Inputs (Level 3) | Government bonds
Assets
Other investments	0	0
Significant Unobservable Inputs (Level 3) | Equity investments
Assets
Other investments	0	0
Significant Unobservable Inputs (Level 3) | Gross foreign exchange contracts
Assets
Derivatives	0	0
Liabilities
Derivatives	$ 0	$ 0

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Guarantee of Registered Securities - Narrative (Details) - subsidiary	Sep. 30, 2019	May 02, 2019	Dec. 31, 2018	Dec. 03, 2018
Condensed Financial Statements, Captions [Line Items]
Number of subsidiaries			2
Aon plc
Condensed Financial Statements, Captions [Line Items]
Parent company's percentage ownership of guarantors	100.00%
5.00% Senior notes due September 2020
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	5.00%
8.205% Junior subordinated deferrable interest debentures due January 2027
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	8.205%
6.25% Senior notes due September 2040
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	6.25%
4.250% Senior notes due 2042
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.25%
4.45% notes due 2043
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.45%
4.00% notes due 2023
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.00%
2.875% notes due 2026
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	2.875%
3.50% Notes due June 2024
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	3.50%
4.60% notes due May 2044
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.60%
4.75% Notes Due May 2045
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.75%
4.500% Senior Notes Due December 2028 | Senior Notes
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	4.50%			4.50%
3.75% Senior Notes Due May 2, 2029 | Senior Notes
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	3.75%	3.75%
2.80% Senior Notes Due 2021
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	2.80%
3.875% due in December 2025
Condensed Financial Statements, Captions [Line Items]
Debt interest rate percentage (as a percent)	3.875%

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Share-Based Compensation Plans - Schedule of Performance-based plans (Details) - Performance Shares - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target PSAs granted during period (in shares)	467	564	548
Weighted average fair value per share at date of grant (in dollars per share)	$ 164	$ 134	$ 114
Number of shares that would be issued based on current performance levels (in shares)	458	958	1,057
Unamortized expense, based on current performance levels	$ 61	$ 54	$ 10

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Restructuring - Narrative (Details) - 2017 Plan $ in Millions	3 Months Ended	9 Months Ended	33 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) job_elimination	Sep. 30, 2019 USD ($) job_elimination
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 125	$ 260	$ 1,263
Expected total cost		1,350	$ 1,350
Number of positions eliminated to date | job_elimination			5,353
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Expected total cost		550	$ 550
Technology rationalization
Restructuring Cost and Reserve [Line Items]
Expected total cost		125	125
Lease consolidation
Restructuring Cost and Reserve [Line Items]
Expected total cost		80	80
Asset impairments
Restructuring Cost and Reserve [Line Items]
Expected total cost		50	50
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Expected total cost		$ 545	$ 545
Minimum
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | job_elimination		5,400
Maximum
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | job_elimination		5,600

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Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Other Financial Data [Abstract]
Deferred revenue	$ 256		$ 256		$ 251
Leases	218		218
Taxes payable	152		152		83
Other	537		537		602
Total	1,163		1,163		$ 936
Revenue recognized from deferred revenue	$ 144	$ 133	$ 385	$ 348

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Other Financial Data - Schedule of Other Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other (Expense) Income
Foreign currency remeasurement	$ 17	$ 3	$ 17	$ 16
Disposal of businesses	1	(3)	8	(4)
Pension and other postretirement	3	0	12	(5)
Equity earnings	1	1	3	3
Financial instruments	(20)	0	(32)	(27)
Total	$ 2	$ 1	$ 8	$ (17)

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Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes revenue from contracts with customers by principal service line (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Commercial Risk Solutions	$	1,057		$	1,029		$	3,342		$	3,379
Reinsurance Solutions	291			279			1,499			1,401
Retirement Solutions	484			501			1,323			1,356
Health Solutions	279			278			1,082			1,038
Data & Analytic Services	271			263			893			834
Elimination	(3		)	(1		)	(11		)	(8		)
Total revenue	$	2,379		$	2,349		$	8,128		$	8,000

Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
United States	$	1,209	$	1,215	$	3,516	$	3,456
Americas other than United States	256		203		723		683
United Kingdom	358		264		1,210		1,161
Europe, Middle East, & Africa other than United Kingdom	283		399		1,793		1,871
Asia Pacific	273		268		886		829
Total revenue	$	2,379	$	2,349	$	8,128	$	8,000

Capitalized Contract Cost

An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	216		$	216		$	329		$	298
Additions	326			332			1,008			1,043
Amortization	(299		)	(305		)	(1,095		)	(1,090		)
Impairment	—			—			—			—
Foreign currency translation and other	(4		)	5			(3		)	(3		)
Balance at end of period	$	239		$	248		$	239		$	248

An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	161		$	144		$	156		$	145
Additions	14			16			40			37
Amortization	(11		)	(9		)	(33		)	(30		)
Impairment	—			—			—			—
Foreign currency translation and other	(1		)	(1		)	—			(2		)
Balance at end of period	$	163		$	150		$	163		$	150

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Acquisitions and Dispositions of Businesses (Tables)

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table includes the fair values of consideration transferred, assets acquired, and liabilities assumed as a result of the Company’s acquisitions (in millions):

	Nine Months Ended September 30, 2019
Consideration Transferred	$	42
Deferred and contingent consideration	8
Aggregate consideration transferred	$	50
Assets acquired
Cash and cash equivalents	$	4
Receivables, net	1
Goodwill	33
Intangible assets, net	22
Fixed assets, net	1
Other assets	13
Total assets acquired	74
Liabilities assumed
Current liabilities	18
Other non-current liabilities	6
Total liabilities assumed	24
Net assets acquired	$	50

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Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Components of net periodic benefit cost for the pension plans

The following table provides the components of the net periodic (benefit) cost recognized in the Condensed Consolidated Statements of Income for Aon’s significant U.K., U.S., and other major pension plans, which are located in the Netherlands and Canada. Service cost is reported in Compensation and benefits and all other components are reported in Other income (expense) as follows (in millions):

	Three Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	26			26			27			24			6			6
Expected return on plan assets, net of administration expenses	(46		)	(46		)	(34		)	(36		)	(9		)	(11		)
Amortization of prior-service cost	—			1			1			—			—			—
Amortization of net actuarial loss	7			6			13			15			3			3
Net periodic (benefit) cost	(13		)	(13		)	7			3			—			(2		)
Loss on pension settlement	—			9			—			—			—			—
Total net periodic (benefit) cost	$	(13	)	$	(4	)	$	7		$	3		$	—		$	(2	)

	Nine Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	81			84			81			74			20			20
Expected return on plan assets, net of administration expenses	(143		)	(147		)	(102		)	(108		)	(29		)	(34		)
Amortization of prior-service cost	1			1			2			1			—			—
Amortization of net actuarial loss	22			21			40			45			9			9
Net periodic (benefit) cost	(39		)	(41		)	21			12			—			(5		)
Loss on pension settlement	—			32			—			—			—			—
Total net periodic (benefit) cost	$	(39	)	$	(9	)	$	21		$	12		$	—		$	(5	)

Schedule of employer's contributions

The following table summarizes contributions made to the Company’s significant pension plans (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Contributions to U.K. pension plans	$	19	$	27	$	65	$	75
Contributions to U.S. pension plans (1)	7		108		30		133
Contributions to other major pension plans	3		3		13		14
Total contributions	$	29	$	138	$	108	$	222

(1)

Includes the Company’s contribution to the qualified U.S. pension plan of $100 million for the three and nine months ended September 30, 2018, which allowed the pension contribution tax deduction to be taken at the 2017 federal tax rate of 35%.

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Condensed Consolidated Statements of Financial Position - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 602	$ 656
Short-term investments	177	172
Receivables, net	2,866	2,760
Fiduciary assets	11,041	10,166
Other current assets	631	618
Total current assets	15,317	14,372
Goodwill	8,071	8,171
Intangible assets, net	874	1,149
Fixed assets, net	606	588
Operating lease right-of-use assets	913
Deferred tax assets	611	561
Prepaid pension	1,213	1,133
Other non-current assets	562	448
Total assets	28,167	26,422
Current liabilities
Accounts payable and accrued liabilities	1,499	1,943
Short-term debt and current portion of long-term debt	1,148	251
Fiduciary liabilities	11,041	10,166
Other current liabilities	1,163	936
Total current liabilities	14,851	13,296
Long-term debt	6,120	5,993
Non-current operating lease liabilities	922
Deferred tax liabilities	209	181
Pension, other postretirement, and postemployment liabilities	1,551	1,636
Other non-current liabilities	953	1,097
Total liabilities	24,606	22,203
Equity
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2019 - 234.1; 2018 - 240.1)	2	2
Additional paid-in capital	6,084	5,965
Retained earnings	1,436	2,093
Accumulated other comprehensive loss	(4,030)	(3,909)
Total Aon shareholders' equity	3,492	4,151
Noncontrolling interests	69	68
Total equity	3,561	4,219
Total liabilities and equity	$ 28,167	$ 26,422

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Acquisitions and Dispositions of Businesses

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Acquisitions and Dispositions of Businesses

Acquisitions and Dispositions of Businesses

Completed Acquisitions

The Company completed three acquisitions during the nine months ended September 30, 2019 and five acquisitions during the nine months ended September 30, 2018. The following table includes the fair values of consideration transferred, assets acquired, and liabilities assumed as a result of the Company’s acquisitions (in millions):

	Nine Months Ended September 30, 2019
Consideration Transferred	$	42
Deferred and contingent consideration	8
Aggregate consideration transferred	$	50
Assets acquired
Cash and cash equivalents	$	4
Receivables, net	1
Goodwill	33
Intangible assets, net	22
Fixed assets, net	1
Other assets	13
Total assets acquired	74
Liabilities assumed
Current liabilities	18
Other non-current liabilities	6
Total liabilities assumed	24
Net assets acquired	$	50

The results of operations of these acquisitions are included in the Financial Statements as of the respective acquisition dates. The Company’s results of operations would not have been materially different if these acquisitions had been reported from the beginning of the period in which they were acquired.

2019 Acquisitions

On July 31, 2019, the Company completed the transaction to acquire Ovatio Courtage SAS, an insurance broker based in France.

On July 31, 2019, the Company completed the transaction to acquire Zalba-Caldu Correduria de Seguros, S.A., a Spanish insurance broker.

On January 1, 2019, the Company completed the transaction to acquire Chapka Assurances SAS based in France.

2018 Acquisitions

On May 9, 2018, the Company completed the transaction to acquire certain assets of 601West, a division of Lee & Hayes, P.L.L.C. based in the United States.

On April 24, 2018, the Company completed the transaction to acquire Inspiring Benefits, S.L., a Spain-based firm specialized in employee loyalty, wellbeing, and rewards programs.

On March 1, 2018, the Company completed the transaction to acquire the business and assets of the trade credit business of Niche International Business Proprietary Limited, a trade credit brokerage based in Johannesburg, South Africa.

On March 1, 2018, the Company completed the transaction to acquire Affinity Risk Partners (Brokers) Pty. Ltd., an insurance broker in Victoria, Australia.

On January 19, 2018, the Company completed the transaction to acquire substantially all of the assets of The Burchfield Group, a provider in pharmacy benefit consulting, auditing, and health plan compliance services based in the United States.

Completed Dispositions

The Company completed two dispositions during the three months ended September 30, 2019 and six dispositions during the nine months ended September 30, 2019. The Company completed two dispositions during the three months ended September 30, 2018 and three dispositions during the nine months ended September 30, 2018.

Total pretax gains recognized for the three and nine months ended September 30, 2019 were $1 million and $8 million, respectively. Total losses, net of gains, recognized for the three and nine months ended September 30, 2018 were $3 million and $4 million, respectively. Gains and losses recognized as a result of a disposition are included in Other income (expense) in the Condensed Consolidated Statements of Income.

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Cash and Cash Equivalents and Short-term Investments

9 Months Ended

Sep. 30, 2019

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Cash and Cash Equivalents and Short-term Investments

Cash and Cash Equivalents and Short-term Investments

Cash and cash equivalents include cash balances and all highly liquid instruments with initial maturities of three months or less.  Short-term investments consist of money market funds. The estimated fair value of cash and cash equivalents and short-term investments approximates their carrying values.

At September 30, 2019, Cash and cash equivalents and Short-term investments were $779 million compared to $828 million at December 31, 2018, a decrease of $49 million. Of the total balances, $96 million and $91 million were restricted as to their use at September 30, 2019 and December 31, 2018, respectively. Included within Short-term investments as of September 30, 2019 and December 31, 2018 were £42.7 million ($52.6 million at September 30, 2019 exchange rates and $53.9 million at December 31, 2018 exchange rates) of operating funds required to be held by the Company in the United Kingdom (the “U.K.”) by the Financial Conduct Authority (the “FCA”), a U.K.-based regulator.

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income	$ 1,191	$ 821
Net income (loss) from discontinued operations	(1)	5
Adjustments to reconcile net income to cash provided by operating activities:
(Gain) loss from sales of businesses, net	(8)	4
Depreciation of fixed assets	124	126
Amortization and impairment of intangible assets	295	492
Share-based compensation expense	252	214
Deferred income taxes	(44)	(128)
Change in assets and liabilities:
Fiduciary receivables	174	766
Short-term investments — funds held on behalf of clients	(1,285)	(731)
Fiduciary liabilities	1,111	(35)
Receivables, net	(167)	(11)
Accounts payable and accrued liabilities	(385)	(331)
Restructuring reserves	(62)	14
Current income taxes	3	(137)
Pension, other postretirement and postemployment liabilities	(127)	(223)
Other assets and liabilities	90	139
Cash provided by operating activities	1,163	975
Cash flows from investing activities
Proceeds from investments	33	30
Payments for investments	(94)	(65)
Net sales (purchases) of short-term investments — non-fiduciary	(7)	356
Acquisition of businesses, net of cash acquired	(39)	(50)
Sale of businesses, net of cash sold	43	(8)
Capital expenditures	(167)	(179)
Cash provided by (used for) investing activities	(231)	84
Cash flows from financing activities
Share repurchase	(1,507)	(1,272)
Issuance of shares for employee benefit plans	(133)	(139)
Issuance of debt	4,918	3,960
Repayment of debt	(3,858)	(3,498)
Cash dividends to shareholders	(307)	(285)
Noncontrolling interests and other financing activities	(81)	(21)
Cash used for financing activities	(968)	(1,255)
Effect of exchange rates on cash and cash equivalents	(18)	(76)
Net increase (decrease) in cash and cash equivalents	(54)	(272)
Cash and cash equivalents at beginning of period	656	756
Cash and cash equivalents at end of period	602	484
Supplemental disclosures:
Interest paid	196	172
Income taxes paid, net of refunds	$ 279	$ 274

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Employee Benefits - Additional Information (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 GBP (£)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 GBP (£)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Estimate of contributions to defined benefit pension plans for the current fiscal year					$ 46
U.K.
Defined Benefit Plan Disclosure [Line Items]
Payment for settlement			£ 125	$ 164
Benefit obligation period increase (decrease)	£ (108)	$ (143)
Benefit obligation, (increase) decrease for settlement	£ 7	$ 9	£ 24	$ 32
Estimate of contributions to defined benefit pension plans for the current fiscal year					80
Other
Defined Benefit Plan Disclosure [Line Items]
Estimate of contributions to defined benefit pension plans for the current fiscal year					$ 19

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Derivatives and Hedging - Foreign Hedge (Details) - Net Investment Hedging € in Millions, $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Derivatives, Fair Value
European denominated commercial paper	$ 546	€ 500	$ 250	€ 220
Effective portion of loss reclassified from Accumulated OCI	$ 38		$ 21

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Segment Information (Details)	9 Months Ended
	Sep. 30, 2019 segment revenue_line metric
Segment Reporting [Abstract]
Number of reportable segments	1
Number of revenue lines | revenue_line	5
Number of performance metrics | metric	4
Number of operating segments	1

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Share-Based Compensation Plans - Performance Share Awards Narrative (Details) - Performance Shares	9 Months Ended
	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting conditions period (in years)	3 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, percent	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, percent	200.00%

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Other Financial Data - Schedule of Other Non-current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other Financial Data [Abstract]
Taxes payable	$ 578	$ 585
Leases	82	169
Deferred revenue	59	65
Compensation and benefits	48	56
Other	186	222
Total	953	1,097
Noncurrent portion of transition tax	$ 218	$ 240

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Other Financial Data - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 65	$ 62	$ 64	$ 59
Provision charged to Other general expenses	7	9	19	21
Accounts written off, net of recoveries	(6)	(8)	(17)	(17)
Foreign currency translation and other	1	3	1	3
Balance at end of period	$ 67	$ 66	$ 67	$ 66

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Restructuring - Schedule of Restructuring and Related Expenses (Details) - 2017 Plan $ in Millions	3 Months Ended		9 Months Ended	33 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) job_elimination
Restructuring Cost and Reserve [Line Items]
Costs incurred	$ 63		$ 281
Expensed		$ 125	260	$ 1,263
Restructuring and Related Cost, Number of Positions Eliminated | job_elimination				5,353
Estimated Remaining Costs	87		87	$ 87
Expected total cost	1,350		1,350	1,350
Expected non-cash expense	100		100	100
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Costs incurred	9		111	525
Estimated Remaining Costs	25		25	25
Expected total cost	550		550	550
Technology rationalization
Restructuring Cost and Reserve [Line Items]
Costs incurred	14		29	109
Estimated Remaining Costs	16		16	16
Expected total cost	125		125	125
Contract termination costs incurred	9		12	18
Expected contract termination cost remaining	20		20	20
Lease consolidation
Restructuring Cost and Reserve [Line Items]
Costs incurred	3		17	53
Estimated Remaining Costs	27		27	27
Expected total cost	80		80	80
Contract termination costs incurred	2		15	48
Expected contract termination cost remaining	80		80	80
Asset impairments
Restructuring Cost and Reserve [Line Items]
Costs incurred	5		7	46
Estimated Remaining Costs	4		4	4
Expected total cost	50		50	50
Other costs associated with restructuring and separation
Restructuring Cost and Reserve [Line Items]
Costs incurred	32		117	530
Estimated Remaining Costs	15		15	15
Expected total cost	545		545	545
Contract termination costs incurred	18		21	109
Expected contract termination cost remaining	$ 116		$ 116	$ 116

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Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Share Repurchase Agreements

The following table summarizes the Company’s Share Repurchase activity (in millions, except per share data):

	Three Months Ended September 30				Nine Months Ended September 30
	2019 (1)		2018		2019 (1)		2018
Shares repurchased	1.8		2.1		8.2		8.8
Average price per share	$	190.83	$	145.71	$	183.26	$	142.15
Costs recorded to retained earnings
Total repurchase cost	$	350	$	300	$	1,500	$	1,250
Additional associated costs	—		1		7		6
Total costs recorded to retained earnings	$	350	$	301	$	1,507	$	1,256

Schedule of Components of Weighted Average Number of Shares

Weighted average ordinary shares outstanding are as follows (in millions):

	Three Months Ended September 30		Nine Months Ended September 30
	2019	2018	2019	2018
Basic weighted average ordinary shares outstanding	236.9	244.0	239.9	246.2
Dilutive effect of potentially issuable shares	2.2	1.6	2.0	1.5
Diluted weighted average ordinary shares outstanding	239.1	245.6	241.9	247.7

Components of Accumulated Other Comprehensive Loss, Net of Related Tax

Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):

	Change in Fair Value of Financial Instruments (1)			Foreign Currency Translation Adjustments			Postretirement Benefit Obligation (2)			Total
Balance at December 31, 2018	$	(15	)	$	(1,319	)	$	(2,575	)	$	(3,909	)
Other comprehensive income (loss) before reclassifications, net	(12		)	(180		)	2			(190		)
Amounts reclassified from accumulated other comprehensive income
Amounts reclassified from accumulated other comprehensive income	12			—			79			91
Tax expense	(3		)	—			(19		)	(22		)
Amounts reclassified from accumulated other comprehensive income, net	9			—			60			69
Net current period other comprehensive income (loss)	(3		)	(180		)	62			(121		)
Balance at September 30, 2019	$	(18	)	$	(1,499	)	$	(2,513	)	$	(4,030	)

(1) Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Revenue, Interest expense, and Compensation and benefits in the accompanying Condensed Consolidated Statements of Income. Refer to Note 15 “Derivatives and Hedging” for further information regarding the Company’s derivative and hedging activity.

(2)

Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense).

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Accounting Principles and Practices Accounting Principles and Practices (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

As a result of applying the modified retrospective approach to adopt the new leasing standard, the following adjustments were made to the Condensed Consolidated Statement of Financial Position as of January 1, 2019 (in millions):

	December 31, 2018					January 1, 2019
	As Reported		Adjustments			As Adjusted
Assets
Operating lease right-of-use assets	$	—	$	1,021		$	1,021
Other non-current assets	$	448	$	78		$	526
Liabilities
Other current liabilities	$	936	$	219		$	1,155
Non-current operating lease liabilities	$	—	$	1,014		$	1,014
Other non-current liabilities	$	1,097	$	(134	)	$	963

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Restructuring (Tables)

9 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

The following table summarizes restructuring and separation costs by type that have been incurred through September 30, 2019 and are estimated to be incurred through the end of the Restructuring Plan (in millions). Estimated costs by type have been revised based on updated assumptions:

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019		Inception to Date		Estimated Remaining Costs		Estimated Total Cost (1)
Workforce reduction	$	9	$	111	$	525	$	25	$	550
Technology rationalization (2)	14		29		109		16		125
Lease consolidation (2)	3		17		53		27		80
Asset impairments	5		7		46		4		50
Other costs associated with restructuring and separation (2) (3)	32		117		530		15		545
Total restructuring and related expenses	$	63	$	281	$	1,263	$	87	$	1,350

(1) Actual costs, when incurred, may vary due to changes in the assumptions built into the Restructuring Plan. Significant assumptions that may change when plans are finalized and implemented include, but are not limited to, changes in severance calculations, changes in the assumptions underlying sublease loss

calculations due to changing market conditions, and changes in the overall analysis that might cause the Company to add or cancel component initiatives. Estimated Total Cost includes $100 million of non-cash charges.

(2) Total contract termination costs incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs, respectively, associated with restructuring and separation for the three months ended September 30, 2019 were $9 million, $2 million, and $18 million; for the nine months ended September 30, 2019, were $12 million, $15 million, and $21 million; and since inception of the Restructuring Plan, were $18 million, $48 million, and $109 million. Total estimated contract termination costs expected to be incurred under the Restructuring Plan associated with Technology rationalizations, Lease consolidations, and Other costs associated with restructuring and separation, are $20 million, $80 million, and $116 million, respectively.

(3)

Other costs associated with the Restructuring Plan include those to separate the Divested Business, as well as moving costs, and consulting and legal fees. These costs are generally recognized when incurred.

Schedule of Restructuring Reserve by Type of Cost

The changes in the Company’s liabilities for the Restructuring Plan as of September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	201
Expensed	260
Cash payments	(322		)
Foreign currency translation	(1		)
Balance as of September 30, 2019	$	138

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Basis of Presentation

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto (the “Financial Statements”) have been prepared in accordance with United States U.S. generally accepted accounting principles (“U.S. GAAP”). The Financial Statements include the accounts of Aon plc and all of its controlled subsidiaries (“Aon” or the “Company”). Intercompany accounts and transactions have been eliminated. The Financial Statements include, in the opinion of management, all adjustments (consisting of normal recurring adjustments and reclassifications) necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows for all periods presented.

Certain information and disclosures normally included in the Financial Statements prepared in accordance with U.S. GAAP have been condensed or omitted. These Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The results for the three and nine months ended September 30, 2019 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2019.

Use of Estimates

The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the Financial Statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the Financial Statements in future periods.

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Condensed Consolidated Statements of Financial Position (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, nominal or par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	750,000,000	750,000,000
Common stock, issued shares (in shares)	234,100,000	240,100,000

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Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill for the nine months ended September 30, 2019 are as follows (in millions):

Balance as of December 31, 2018	$	8,171
Goodwill related to current year acquisitions	33
Goodwill related to disposals	(10		)
Goodwill related to prior year acquisitions	2
Foreign currency translation and other	(125		)
Balance as of September 30, 2019	$	8,071

Other intangible assets by asset class are as follows (in millions):

	September 30, 2019						December 31, 2018
	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
Customer related and contract based	$	2,229	$	1,531	$	698	$	2,240	$	1,444	$	796
Tradenames	1,025		899		126		1,027		740		287
Technology and other	375		325		50		391		325		66
Total	$	3,629	$	2,755	$	874	$	3,658	$	2,509	$	1,149

The estimated future amortization for finite lived intangible assets as of September 30, 2019 is as follows (in millions):

Remainder of 2019	$	96
2020	220
2021	126
2022	86
2023	76
2024	59
Thereafter	211
Total	$	874

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Other Financial Data

9 Months Ended

Sep. 30, 2019

Other Financial Data [Abstract]

Other Financial Data

Other Financial Data

Condensed Consolidated Statements of Income Information

Other Income (Expense)

Other income (expense) consists of the following (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Foreign currency remeasurement	$	17		$	3		$	17		$	16
Disposal of businesses	1			(3		)	8			(4		)
Pension and other postretirement	3			—			12			(5		)
Equity earnings	1			1			3			3
Financial instruments	(20		)	—			(32		)	(27		)
Total	$	2		$	1		$	8		$	(17	)

Condensed Consolidated Statements of Financial Position Information

Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts are as follows (in millions):

	Three Months Ended September 30						Nine Months Ended September 30
	2019			2018			2019			2018
Balance at beginning of period	$	65		$	62		$	64		$	59
Provision charged to Other general expense	7			9			19			21
Accounts written off, net of recoveries	(6		)	(8		)	(17		)	(17		)
Foreign currency translation and other	1			3			1			3
Balance at end of period	$	67		$	66		$	67		$	66

Other Current Assets

The components of Other current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to fulfill contracts with customers (1)	$	239	$	329
Prepaid expenses	123		97
Taxes receivable	177		113
Other (2)	92		79
Total	$	631	$	618

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2) December 31, 2018 includes $12 million previously classified as “Receivables from the Divested Business”.

Other Non-Current Assets

The components of Other non-current assets are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Costs to obtain contracts with customers (1)	$	163	$	156
Taxes receivable	100		100
Leases (2)	106		—
Investments	52		54
Other	141		138
Total	$	562	$	448

(1) Refer to Note 3 “Revenue from Contracts with Customers” for further information.

(2) Refer to Note 20 “Lease Commitments” for further information.

Other Current Liabilities

The components of Other current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Deferred revenue (1)	$	256	$	251
Leases (2)	218		—
Taxes payable	152		83
Other	537		602
Total	$	1,163	$	936

(1) During the three and nine months ended September 30, 2019, $144 million and $385 million, respectively, was recognized in the Condensed Consolidated Statements of Income. During the three and nine months ended September 30, 2018, $133 million and $348 million, respectively, was recognized in the Condensed Consolidated Statements of Income.

(2) Refer to Note 20 “Lease Commitments” for further information.

Other Non-Current Liabilities

The components of Other non-current liabilities are as follows (in millions):

As of	September 30, 2019		December 31, 2018
Taxes payable (1)	$	578	$	585
Leases	82		169
Deferred revenue	59		65
Compensation and benefits	48		56
Other	186		222
Total	$	953	$	1,097

(1) Includes $218 million and $240 million for the non-current portion of the one-time mandatory transition tax on accumulated foreign earnings as of September 30, 2019 and December 31, 2018, respectively.

XML

Cover - shares	9 Months Ended
	Sep. 30, 2019	Oct. 24, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	1-7933
Entity Registrant Name	Aon plc
Entity Incorporation, State or Country Code	X0
Entity Tax Identification Number	98-1030901
Entity Address, Address Line One	122 LEADENHALL STREET
Entity Address, City or Town	LONDON
Entity Address, Country	GB
Entity Address, Postal Zip Code	EC3V 4AN
City Area Code	20
Local Phone Number	7623 5500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		234,137,408
Entity Central Index Key	0000315293
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3

XML

Claims, Lawsuits and Other Contingencies

9 Months Ended

Sep. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Claims, Lawsuits and Other Contingencies

Claims, Lawsuits, and Other Contingencies

Legal

Aon and its subsidiaries are subject to numerous claims, tax assessments, lawsuits and proceedings that arise in the ordinary course of business, which frequently include errors and omissions (“E&O”) claims. The damages claimed in these matters are or may be

substantial, including, in many instances, claims for punitive, treble or extraordinary damages. While Aon maintains meaningful E&O insurance and other insurance programs to provide protection against certain losses that arise in such matters, Aon has exhausted or materially depleted its coverage under some of the policies that protect the Company and, consequently, is self-insured or materially self-insured for some claims. Accruals for these exposures, and related insurance receivables, when applicable, are included in the Condensed Consolidated Statements of Financial Position and have been recognized in Other general expense in the Condensed Consolidated Statements of Income to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Matters that are not probable and reasonably estimable are not accrued for in the financial statements.

The Company has included in the current matters described below certain matters in which (1) loss is probable, (2) loss is reasonably possible, that is, more than remote but not probable, or (3) there exists the reasonable possibility of loss greater than the accrued amount. In addition, the Company may from time to time disclose matters for which the probability of loss could be remote but the claim amounts associated with such matters are potentially significant. The reasonably possible range of loss for the matters described below for which loss is estimable, in excess of amounts that are deemed probable and estimable and therefore already accrued, is estimated to be between $0 and $0.1 billion, exclusive of any insurance coverage. These estimates are based on available information as of the date of this filing. As available information changes, the matters for which Aon is able to estimate may change, and the estimates themselves may change. In addition, many estimates involve significant judgment and uncertainty. For example, at the time of making an estimate, Aon may only have limited information about the facts underlying the claim, and predictions and assumptions about future court rulings and outcomes may prove to be inaccurate. Although management at present believes that the ultimate outcome of all matters described below, individually or in the aggregate, will not have a material adverse effect on the consolidated financial position of Aon, legal proceedings are subject to inherent uncertainties and unfavorable rulings or other events. Unfavorable resolutions could include substantial monetary or punitive damages imposed on Aon or its subsidiaries. If unfavorable outcomes of these matters were to occur, future results of operations or cash flows for any particular quarterly or annual period could be materially adversely affected.

Current Matters

A pensions consulting and administration subsidiary of Aon provided advisory services to the Trustees of the Gleeds pension fund in the United Kingdom and, on occasion, to the relevant employer of the fund.  In April 2014, the High Court, Chancery Division, London found that certain governing documents of the fund that sought to alter the fund’s benefit structure and that had been drafted by Aon were procedurally defective and therefore invalid. No lawsuit naming Aon as a party was filed, although a tolling agreement was entered. The High Court decision says that the additional liabilities in the pension fund resulting from the alleged defect in governing documents amount to approximately £45 million ($55 million at September 30, 2019 exchange rates). In December 2014, the Court of Appeal granted the employer leave to appeal the High Court decision. At a hearing in October 2016, the Court of Appeal approved a settlement of the pending litigation. On October 31, 2016, the fund’s trustees and employer sued Aon in the High Court, Chancery Division, London, alleging negligence and breach of duty in relation to the governing documents. The proceedings were served on Aon on December 20, 2016. The claimants seek damages of approximately £70 million ($86 million at September 30, 2019 exchange rates) plus interest and costs. In February 2018, the claimants instructed new lawyers and added their previous lawyers as defendants to the Aon lawsuit. Claimants have alleged that the previous lawyers were responsible for some of the losses sought from Aon because the lawyers gave negligent legal advice during the course of the High Court and Court of Appeal proceedings. Aon believes that it has meritorious defenses and intends to vigorously defend itself against this claim.

On October 3, 2017, Christchurch City Council (“CCC”) invoked arbitration to pursue a claim that it asserts against Aon New Zealand. Aon provided insurance broking services to CCC in relation to CCC’s 2010-2011 material damage and business interruption program. In December 2015, CCC settled its property and business interruption claim for its losses arising from the 2010-2011 Canterbury earthquakes against the underwriter of its material damage and business interruption program and the reinsurers of that underwriter. CCC contends that acts and omissions by Aon caused CCC to recover less in that settlement than it otherwise would have. CCC claims damages of approximately NZD 528 million ($333 million at September 30, 2019 exchange rates) plus interest and costs. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims.

A retail insurance brokerage subsidiary of Aon was sued on September 6, 2018 in the United States District Court for the Southern District of New York by a client, Pilkington North America, Inc., that sustained damage from a tornado to its Ottawa, Illinois property. The lawsuit seeks between $45 million and $85 million in property and business interruption damages from either its insurer or Aon. The insurer contends that insurance proceeds were limited to $15 million in coverage by a windstorm sub-limit purportedly contained in the policy procured by Aon for Pilkington. The insurer therefore has tendered $15 million to Pilkington and denied coverage for the remainder of the loss. Pilkington sued the insurer and Aon seeking full coverage for the loss from the insurer or, in the alternative, seeking the same damages against Aon on various theories of professional liability if the court finds

that the $15 million sub-limit applies to the claim. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims.    

In April 2017, the FCA announced an investigation relating to suspected competition law breaches in the aviation and aerospace broking industry, which, for Aon in 2016, represented less than $100 million in global revenue. The European Commission has now assumed jurisdiction over the investigation in place of the FCA. Other antitrust agencies outside the European Union are also conducting formal or informal investigations regarding these matters. Aon intends to work diligently with all antitrust agencies concerned to ensure they can carry out their work as efficiently as possible. At this time, in light of the uncertainties and many variables involved, Aon cannot estimate the ultimate impact on our company from these investigations or any related private litigation, nor any damages, penalties, or fines related to them. There can be no assurance that the ultimate resolution of these matters will not have a material adverse effect on the Company’s consolidated financial position, results of operations, or liquidity.

Settled/Closed Matters

On June 29, 2015, Lyttelton Port Company Limited (“LPC”) sued Aon New Zealand in the Christchurch Registry of the High Court of New Zealand. LPC alleges, among other things, that Aon was negligent and in breach of contract in arranging LPC’s property insurance program for the period covering June 30, 2010 to June 30, 2011. LPC contended that acts and omissions by Aon caused LPC to recover less than it otherwise would have from insurers for losses suffered in the 2010 and 2011 Canterbury earthquakes. LPC claimed damages of approximately NZD 184 million ($116 million at September 30, 2019 exchange rates) plus interest and costs. In April 2019, the case was settled with no admission of liability on the part of Aon. The terms of this settlement did not have a significant impact on Aon’s results of operations or financial condition.

Guarantees and Indemnifications

The Company provides a variety of guarantees and indemnifications to its customers and others. The maximum potential amount of future payments represents the notional amounts that could become payable under the guarantees and indemnifications if there were a total default by the guaranteed parties, without consideration of possible recoveries under recourse provisions or other methods. These amounts may bear no relationship to the expected future payments, if any, for these guarantees and indemnifications. Any anticipated amounts payable are included in the Company’s Financial Statements, and are recorded at fair value.

The Company expects that, as prudent business interests dictate, additional guarantees and indemnifications may be issued from time to time.

Redomestication

In connection with the Redomestication, the Company on April 2, 2012 entered into various agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under issued and outstanding debt securities. Those agreements included the (1) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc, and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”) (amending and restating the Indenture, dated as of September 10, 2010, between Aon Corporation and the Trustee), (2) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of December 16, 2002, between Aon Corporation and the Trustee), and (3) Amended and Restated Indenture, dated as of April 2, 2012, among Aon Corporation, Aon plc and the Trustee (amending and restating the Indenture, dated as of January 13, 1997, as supplemented by the First Supplemental Indenture, dated as of January 13, 1997).

Sale of the Divested Business

In connection with the sale of the Divested Business, the Company guaranteed future operating lease commitments related to certain facilities assumed by the Buyer. The Company is obligated to perform under the guarantees if the Divested Business defaults on such leases at any time during the remainder of the lease agreements, which expire on various dates through 2025. As of September 30, 2019, the undiscounted maximum potential future payments under the lease guarantee is $74 million, with an estimated fair value of $14 million. No cash payments were made in connection to the lease commitments during the three and nine months ended September 30, 2019.

Additionally, the Company is subject to performance guarantee requirements under certain client arrangements that were assumed by the Buyer. Should the Divested Business fail to perform as required by the terms of the arrangements, the Company would be required to fulfill the remaining contract terms, which expire on various dates through 2023. As of September 30, 2019, the undiscounted maximum potential future payments under the performance guarantees were $160 million, with an estimated fair value of $1 million. No cash payments were made in connection to the performance guarantees during the three and nine months ended September 30, 2019.

Letters of Credit

Aon has entered into a number of arrangements whereby the Company’s performance on certain obligations is guaranteed by a third party through the issuance of letters of credit (“LOCs”). The Company had total LOCs outstanding of approximately $71 million at September 30, 2019, compared to $83 million at December 31, 2018. These LOCs cover the beneficiaries related to certain of Aon’s U.S. and Canadian non-qualified pension plan schemes and secure deductible retentions for Aon’s own workers compensation program. The Company has also obtained LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. The maximum exposure with respect to such contractual contingent guarantees was approximately $83 million at September 30, 2019 compared to $103 million at December 31, 2018.

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Employee Benefits

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Employee Benefits

Employee Benefits

The following table provides the components of the net periodic (benefit) cost recognized in the Condensed Consolidated Statements of Income for Aon’s significant U.K., U.S., and other major pension plans, which are located in the Netherlands and Canada. Service cost is reported in Compensation and benefits and all other components are reported in Other income (expense) as follows (in millions):

	Three Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	26			26			27			24			6			6
Expected return on plan assets, net of administration expenses	(46		)	(46		)	(34		)	(36		)	(9		)	(11		)
Amortization of prior-service cost	—			1			1			—			—			—
Amortization of net actuarial loss	7			6			13			15			3			3
Net periodic (benefit) cost	(13		)	(13		)	7			3			—			(2		)
Loss on pension settlement	—			9			—			—			—			—
Total net periodic (benefit) cost	$	(13	)	$	(4	)	$	7		$	3		$	—		$	(2	)

	Nine Months Ended September 30
	U.K.						U.S.						Other
	2019			2018			2019			2018			2019			2018
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost	81			84			81			74			20			20
Expected return on plan assets, net of administration expenses	(143		)	(147		)	(102		)	(108		)	(29		)	(34		)
Amortization of prior-service cost	1			1			2			1			—			—
Amortization of net actuarial loss	22			21			40			45			9			9
Net periodic (benefit) cost	(39		)	(41		)	21			12			—			(5		)
Loss on pension settlement	—			32			—			—			—			—
Total net periodic (benefit) cost	$	(39	)	$	(9	)	$	21		$	12		$	—		$	(5	)

In March 2017, the Company approved a plan to offer a voluntary one-time lump sum payment option to certain eligible employees of the Company’s U.K. pension plans that, if accepted, would settle the Company’s pension obligations to them. The lump sum cash payment offer closed during 2018. For the nine months ended September 30, 2018, lump sum payments from plan assets of £125 million ($164 million using September 30, 2018 exchange rates) were paid. As a result of this settlement, the Company remeasured the assets and liabilities of the U.K. pension plan during the third quarter of 2018, which in aggregate resulted in a reduction to the projected benefit obligation of £108 million ($143 million using September 30, 2018 exchange rates), as well as a non-cash settlement charge of £7 million ($9 million using average September 30, 2018 exchange rates) in the third quarter of 2018 and £24 million ($32 million using average exchange rates) for the nine months ended September 30, 2018.

Contributions

The Company expects to make total cash contributions of approximately $80 million, $46 million, and $19 million, based on exchange rates as of December 31, 2018, to its significant U.K., U.S., and other major pension plans, respectively, during 2019. The following table summarizes contributions made to the Company’s significant pension plans (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Contributions to U.K. pension plans	$	19	$	27	$	65	$	75
Contributions to U.S. pension plans (1)	7		108		30		133
Contributions to other major pension plans	3		3		13		14
Total contributions	$	29	$	138	$	108	$	222

(1)

Includes the Company’s contribution to the qualified U.S. pension plan of $100 million for the three and nine months ended September 30, 2018, which allowed the pension contribution tax deduction to be taken at the 2017 federal tax rate of 35%.

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Accounting Principles and Practices (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto (the “Financial Statements”) have been prepared in accordance with United States U.S. generally accepted accounting principles (“U.S. GAAP”). The Financial Statements include the accounts of Aon plc and all of its controlled subsidiaries (“Aon” or the “Company”). Intercompany accounts and transactions have been eliminated. The Financial Statements include, in the opinion of management, all adjustments (consisting of normal recurring adjustments and reclassifications) necessary to present fairly the Company’s consolidated financial position, results of operations and cash flows for all periods presented.

Certain information and disclosures normally included in the Financial Statements prepared in accordance with U.S. GAAP have been condensed or omitted. 

Use of Estimates

Use of Estimates

The preparation of the accompanying Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the Financial Statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the Financial Statements in future periods.

New Accounting Standards

Adoption of New Accounting Standards

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the Financial Accounting Standards Board (“FASB”) issued new accounting guidance related to reclassification of certain tax effects from accumulated other comprehensive income. The guidance allowed a reclassification from accumulated comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The guidance was effective for the Company in the first quarter of 2019. For the three and nine months ended September 30, 2019, there was no impact on the net income of the Company as Aon did not elect to reclassify stranded tax effects on the Condensed Consolidated Statement of Financial Position. It is the Company’s policy to release income tax effects from accumulated other comprehensive loss using the portfolio approach.

Targeted Improvements to Accounting for Hedging Activities

In August 2017, the FASB issued new accounting guidance on targeted improvements to accounting for hedging activities. The new guidance amended its hedge accounting model to enable entities to better portray their risk management activities in the financial statements. The guidance eliminated the requirement to separately measure and report hedge ineffectiveness and required the effect of a hedging instrument to be presented in the same income statement line as the hedged item. The new guidance was effective for Aon in the first quarter of 2019 and the Company adopted it on a modified retrospective basis with no cumulative effect adjustment to accumulated other comprehensive income or corresponding adjustment to Retained earnings. Changes to the Condensed Consolidated Statement of Income and financial statement disclosures were applied prospectively. Under the new guidance, gains or losses on certain derivative hedging instruments are recognized in Revenue, as opposed to Other income (expense) under the previous guidance. For the three and nine months ended September 30, 2019, the adoption of this guidance had no impact on the net income and an insignificant impact on the operating income of the Company.

Leases

In February 2016, the FASB issued a new accounting standard on leases, which requires lessees to recognize assets and liabilities for most leases. Under the new standard, a lessee is required to recognize in the Consolidated Statements of Financial Position, liabilities to make future lease payments and right-of-use (“ROU”) assets representing its right to use the underlying assets for the lease term. The recognition, measurement, timing, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from previous U.S. GAAP.

The Company adopted the new standard as of January 1, 2019, using the modified retrospective approach for all leases existing at, or entered into after, the period of adoption. Under this approach, prior periods were not restated. Rather, lease balances and other disclosures for prior periods were provided in the notes to the financial statements as previously reported, and the cumulative effect of initially applying the guidance was recognized in the Condensed Consolidated Statement of Financial Position as of September 30, 2019.

The modified retrospective approach includes several optional practical expedients available that entities may elect to apply upon transition. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. The Company elected the package of practical expedients permitted under the transition guidance within the new standard, which allows a lessee to carryforward their population of existing leases, the classification of each lease, as well as the treatment of initial direct costs as of the period of adoption. In addition, the Company elected the practical expedient related to lease and non-lease components, as an accounting policy election for all asset classes, which allows a lessee to not separate non-lease from lease components and instead account for consideration paid in a contract as a single lease component. Lastly, the Company did not elect the practical expedient related to hindsight analysis which allows a lessee to use hindsight in determining the lease term and in assessing impairment of the entity’s ROU assets.

The Company has made a policy election to not recognize ROU assets and lease liabilities that arise from leases with an initial term of twelve months or less on the Condensed Consolidated Statements of Financial Position. However, the Company will recognize these lease payments in the Condensed Consolidated Statements of Income on a straight-line basis over the lease term and variable lease payments in the period in which the obligation is incurred. The Company has chosen to apply this accounting policy across all classes of underlying assets. Additionally, upon adoption, the Company utilized a discount rate to determine the present value of the lease payments based on information available as of January 1, 2019.

Beginning January 1, 2019, operating ROU assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the commencement date. Operating leases in effect prior to January 1, 2019 were recognized at the present value of the remaining payments on the remaining lease term as of January 1, 2019. Upon adoption, the Company recognized ROU assets and lease liabilities of $1.1 billion and $1.3 billion, respectively. The standard had an insignificant impact on the Condensed Consolidated Statements of Income and no impact on the Condensed Consolidated Statements of Cash Flows. Refer to Note 20 “Lease Commitments” for further information including significant assumptions and judgments made.

As a result of applying the modified retrospective approach to adopt the new leasing standard, the following adjustments were made to the Condensed Consolidated Statement of Financial Position as of January 1, 2019 (in millions):

	December 31, 2018					January 1, 2019
	As Reported		Adjustments			As Adjusted
Assets
Operating lease right-of-use assets	$	—	$	1,021		$	1,021
Other non-current assets	$	448	$	78		$	526
Liabilities
Other current liabilities	$	936	$	219		$	1,155
Non-current operating lease liabilities	$	—	$	1,014		$	1,014
Other non-current liabilities	$	1,097	$	(134	)	$	963

Accounting Standards Issued But Not Yet Adopted

Cloud Computing Arrangements

In August 2018, the FASB issued new accounting guidance on implementation costs incurred in a cloud computing arrangement that is a service contract. The new guidance aligns capitalization requirements for certain implementation costs incurred in cloud computing arrangements with existing requirements for capitalizing implementation costs for internal-use software. These costs will be deferred over the term of the hosting arrangement, including any optional renewal periods the entity is reasonably certain to exercise. An entity may apply the new guidance on either a prospective or retrospective basis. The new guidance is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting guidance in the first quarter of 2020 on a prospective basis for all implementation costs incurred after the date of initial adoption.

Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued new accounting guidance related to the disclosure requirements for employers that sponsor defined benefit pension and other postretirement benefit plans. The guidance requires sponsors of these plans to provide additional disclosures, including weighted average interest rates used in the entity’s cash balance pension plans and a narrative description of reasons for any significant gains or losses impacting the benefit obligation for the period, and eliminates certain previous disclosure requirements. The new guidance is effective for Aon in the first quarter of 2021 with early adoption permitted and will be applied retrospectively. The Company is currently evaluating the impact that the guidance will have on the Financial Statements and the period of adoption.

Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued new accounting guidance on simplifying the test for goodwill impairment. Currently the standard requires an entity to perform a two-step test to determine the amount, if any, of goodwill impairment. In Step 1, an entity compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, the entity performs Step 2 and compares the implied fair value of goodwill with the carrying amount of that goodwill for that reporting unit. An impairment charge equal to the amount by which the carrying amount of goodwill for the reporting unit exceeds the implied fair value of that goodwill is recorded, limited to the amount of goodwill allocated to that reporting unit. The new guidance removes Step 2. An entity will apply a one-step quantitative test and record the amount of goodwill impairment as the excess of a reporting unit’s carrying amount over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. The new guidance does not amend the optional qualitative assessment of goodwill impairment. An entity will apply the new guidance on a prospective basis. The new guidance is effective for Aon in the first quarter of 2020 and early adoption is permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new guidance in the first quarter of 2020.

Credit Losses

In June 2016, the FASB issued a new accounting standard on the measurement of credit losses on financial instruments. The new standard replaces the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. An entity will apply the new standard through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the standard is effective. The new standard is effective for Aon in the first quarter of 2020 with early adoption permitted. The Company does not expect there to be a significant impact on the Financial Statements and will adopt the new accounting standard in the first quarter of 2020.

Derivatives

The Company is exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, the Company enters into various derivative instruments that reduce these risks by creating offsetting exposures. The Company does not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it earns revenues, pays expenses, enters into monetary intercompany transfers, or other transactions denominated in a currency that differs from its functional currency. The Company uses foreign exchange derivatives, typically forward contracts, options and cross currency swaps, to reduce its overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than 2 years. These derivatives are accounted for as hedges, and changes in fair value are recorded each period in Other comprehensive income (loss) in the Condensed Consolidated Statements of Comprehensive Income.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to economically hedge the currency exposure of the Company’s global liquidity profile, including monetary assets or liabilities that are denominated in a non-functional currency of an entity, typically on a rolling 30-day basis, but may be for up to 1 year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income (expense) in the Condensed Consolidated Statements of Income.

Fair Value Measurement

The following methods and assumptions are used to estimate the fair values of the Company’s financial instruments:

Money market funds consist of institutional prime, treasury, and government money market funds. The Company reviews treasury and government money market funds to obtain reasonable assurance that the fund net asset value is $1 per share, and reviews the floating net asset value of institutional prime money market funds for reasonableness. 

Equity investments consist of domestic and international equity securities and equity derivatives valued using the closing stock price on a national securities exchange. Over the counter equity derivatives are valued using observable inputs such as underlying prices of the underlying security and volatility. On a sample basis the Company reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and independently verifies the observable inputs for Level 2 equity derivatives and securities.

Fixed income investments consist of certain categories of bonds and derivatives. Corporate, government, and agency bonds are valued by pricing vendors who estimate fair value using recently executed transactions and proprietary models based on observable inputs, such as interest rate spreads, yield curves, and credit risk. Asset-backed securities are valued by pricing vendors who estimate fair value using discounted cash flow models utilizing observable inputs based on trade and quote activity of securities with similar features. Fixed income derivatives are valued by pricing vendors using observable inputs such as interest rates and yield curves. The Company obtains an understanding of the models, inputs, and assumptions used in developing prices provided by its vendors through discussions with the fund managers. The Company independently verifies the observable inputs, as well as assesses assumptions used for reasonableness based on relevant market conditions and internal Company guidelines. If an assumption is deemed unreasonable, based on the Company’s guidelines, it is then reviewed by management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and historically are not material to the fair value estimates used in the Financial Statements.

Derivatives are carried at fair value, based upon industry standard valuation techniques that use, where possible, current market-based or independently sourced pricing inputs, such as interest rates, currency exchange rates, or implied volatilities.

Debt is carried at outstanding principal balance, less any unamortized issuance costs, discount or premium. Fair value is based on quoted market prices or estimates using discounted cash flow analyses based on current borrowing rates for similar types of borrowing arrangements.

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Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	19.60%	20.10%	16.60%	1.10%

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Lease Commitments - Lease Maturity Prior to Topic 842 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Gross rental commitments
2019	$ 303
2020	253
2021	221
2022	182
2023	148
Thereafter	472
Total minimum payments required	1,579
Rentals from subleases
2019	(34)
2020	(30)
2021	(30)
2022	(30)
2023	(12)
Thereafter	(5)
Total minimum payments required	(141)
Operating Lease Payments Net Of Sublease Rental Income [Abstract]
2019	269
2020	223
2021	191
2022	152
2023	136
Thereafter	467
Total minimum payments required	$ 1,438

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Lease Commitments - Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 43	$ 176
Finance lease costs
Amortization of leased assets	7	20
Interest on lease liabilities	0	1
Variable lease cost	31	49
Short-term lease cost	1	3
Sublease income	(8)	(24)
Net lease cost	$ 74	$ 225

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- Goodwill and Other Intangible Assets Rollforward (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Changes in the net carrying amount of goodwill by operating segment
Beginning balance	$ 8,171
Goodwill related to current year acquisitions	33
Goodwill related to disposals	(10)
Goodwill related to prior year acquisitions	2
Foreign currency translation and other	(125)
Ending balance	$ 8,071

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Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 216	$ 216	$ 329	$ 298
Additions	326	332	1,008	1,043
Amortization	(299)	(305)	(1,095)	(1,090)
Impairment	0	0	0	0
Foreign currency translation and other	(4)	5	(3)	(3)
Balance at end of period	239	248	239	248
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	161	144	156	145
Additions	14	16	40	37
Amortization	(11)	(9)	(33)	(30)
Impairment	0	0	0	0
Foreign currency translation and other	(1)	(1)	0	(2)
Balance at end of period	$ 163	$ 150	$ 163	$ 150

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Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Share-based compensation expense recognized in continuing operations

The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Restricted share units (“RSUs”)	$	42	$	41	$	155	$	145
Performance share awards (“PSAs”)	28		24		90		63
Employee share purchase plans	2		2		7		6
Total share-based compensation expense	$	72	$	67	$	252	$	214

Restricted share unit activity

The following table summarizes the status of the Company’s RSUs, including shares related to the Divested Business (shares in thousands, except fair value):

	Nine Months Ended September 30, 2019				Nine Months Ended September 30, 2018
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	4,208		$	120	4,849		$	104
Granted	1,225		$	174	1,409		$	140
Vested	(1,551	)	$	112	(1,772	)	$	97
Forfeited	(164	)	$	128	(158	)	$	111
Non-vested at end of period	3,718		$	141	4,328		$	118

(1)

Represents per share weighted average fair value of award at date of grant.

Performance-based plans

The following table summarizes the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the nine months ended September 30, 2019 and the years ended December 31, 2018 and 2017, respectively (shares in thousands and dollars in millions, except fair value):

	September 30, 2019		December 31, 2018		December 31, 2017
Target PSAs granted during period	467		564		548
Weighted average fair value per share at date of grant	$	164	$	134	$	114
Number of shares that would be issued based on current performance levels	458		958		1,057
Unamortized expense, based on current performance levels	$	61	$	54	$	10

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Lease Commitments - (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Assets And Liabilities Of Lessee

The classification of operating and finance lease asset and liability balances within the Condensed Consolidated Statements of Financial Position is as follows (in millions):

As of		September 30, 2019
Assets
Operating lease assets	Operating lease right-of-use assets	$	913
Finance lease assets	Other non-current assets	106
Total lease assets		$	1,019
Liabilities
Current lease liabilities
Operating	Other current liabilities	$	194
Finance	Other current liabilities	24
Non-current lease liabilities
Operating	Non-current operating lease liabilities	922
Finance	Other non-current liabilities	82
Total lease liabilities		$	1,222

Lease, Cost

Weighted average remaining lease term and discount rate related to operating and finance leases are as follows:

As of	September 30, 2019
Weighted average remaining lease term (years)
Operating leases	8.0
Finance leases	4.6
Weighted average discount rate
Operating leases	3.3	%
Finance leases	2.0	%

Other cash and non-cash related activities are as follows (in millions):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	182
Financing cash flows from finance leases	$	11
Non-cash related activities
ROU assets obtained in exchange for new operating lease liabilities	$	95
ROU assets obtained in exchange for new finance lease liabilities	$	48

The components of lease costs are as follows (in millions):

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
Operating lease cost	$	43		$	176
Finance lease costs
Amortization of leased assets	7			20
Interest on lease liabilities	—			1
Variable lease cost	31			49
Short-term lease cost (1)	1			3
Sublease income	(8		)	(24		)
Net lease cost	$	74		$	225

(1) Short-term lease cost does not include expenses related to leases with a lease term of one month or less.

Lessee Operating Lease Liability Maturity

Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438

Finance Lease, Liability, Maturity

Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438

Lessor, Operating Lease, Payments to be Received, Maturity

Maturity analysis of operating and finance leases as of September 30, 2019 are as follows (in millions):

	Operating			Finance			Less:
	Leases			Leases			Subleases			Total
Remainder of 2019	$	61		$	7		$	(9	)	$	59
2020	246			26			(34		)	238
2021	225			26			(33		)	218
2022	199			19			(33		)	185
2023	144			18			(14		)	148
Thereafter	513			15			(6		)	522
Total undiscounted future minimum lease payments	1,388			111			(129		)	1,370
Less: Imputed interest	(143		)	(5		)	—			(148		)
Present value of lease liabilities	$	1,245		$	106		$	(129	)	$	1,222

At December 31, 2018, future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year are as follows (in millions):

Year Ended December 31, 2018	Gross rental commitments		Rentals from subleases			Net rental commitments
2019	$	303	$	(34	)	$	269
2020	253		(30		)	223
2021	221		(30		)	191
2022	182		(30		)	152
2023	148		(12		)	136
Thereafter	472		(5		)	467
Total minimum payments required	$	1,579	$	(141	)	$	1,438