10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

FOR THE QUARTERLY PERIOD ENDED September 30, 2013

OR

oTRANSITION 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.)

8 DEVONSHIRE SQUARE, LONDON, ENGLAND	EC2M 4PL
(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  ý  NO  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, 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 and post such files).  YES  ý  NO  o

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

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  YES o NO ý

Number of Class A Ordinary Shares of Aon plc, $0.01 nominal value, outstanding as of September 30, 2013:  301,048,034

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, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Revenue
Commissions, fees and other	$	2,786		$	2,726		$	8,585		$	8,368
Fiduciary investment income	8			11			21			31
Total revenue	2,794			2,737			8,606			8,399
Expenses
Compensation and benefits	1,666			1,620			5,103			4,920
Other general expenses	764			778			2,347			2,344
Total operating expenses	2,430			2,398			7,450			7,264
Operating income	364			339			1,156			1,135
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other income (expense)	39			(9		)	54			3
Income from continuing operations before income taxes	353			274			1,063			971
Income taxes	89			64			275			257
Income from continuing operations	264			210			788			714
Loss from discontinued operations before income taxes	—			—			—			(1		)
Income taxes	—			—			—			—
Loss from discontinued operations	—			—			—			(1		)
Net Income	264			210			788			713
Less: Net income attributable to noncontrolling interests	8			6			30			25
Net income attributable to Aon shareholders	$	256		$	204		$	758		$	688
Net income (loss) attributable to Aon shareholders
Income from continuing operations	$	256		$	204		$	758		$	689
Loss from discontinued operations	—			—			—			(1		)
Net income	$	256		$	204		$	758		$	688
Basic net income per share attributable to Aon shareholders
Continuing operations	$	0.83		$	0.62		$	2.42		$	2.08
Discontinued operations	—			—			—			—
Net income	$	0.83		$	0.62		$	2.42		$	2.08
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	0.82		$	0.62		$	2.39		$	2.06
Discontinued operations	—			—			—			—
Net income	$	0.82		$	0.62		$	2.39		$	2.06
Cash dividends per share paid on ordinary shares	$	0.18		$	0.16		$	0.51		$	0.46
Weighted average ordinary shares outstanding - basic	309.5			327.3			313.2			330.6
Weighted average ordinary shares outstanding - diluted	312.9			331.0			316.7			334.4

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

2

Aon plc

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

	Three Months Ended					Nine Months Ended
(millions)	September 30, 2013			September 30, 2012		September 30, 2013			September 30, 2012
Net income	$	264		$	210	$	788		$	713
Less: Net income attributable to noncontrolling interests	8			6		30			25
Net income attributable to Aon shareholders	256			204		758			688
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	(14		)	—		(1		)	—
Change in fair value of derivatives	9			15		(12		)	5
Foreign currency translation adjustments	155			164		(77		)	71
Post-retirement benefit obligation	24			7		65			46
Total other comprehensive income (loss)	174			186		(25		)	122
Less: Other comprehensive income attributable to noncontrolling interests	3			4		1			2
Total other comprehensive income (loss) attributable to Aon shareholders	171			182		(26		)	120
Comprehensive income attributable to Aon shareholders	$	427		$	386	$	732		$	808

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

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Aon plc

Condensed Consolidated Statements of Financial Position

(millions, except nominal value)	Sept 30, 2013			Dec 31, 2012
	(Unaudited)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	369		$	291
Short-term investments	357			346
Receivables, net	2,666			3,101
Fiduciary assets	11,698			12,214
Other current assets	484			430
Total Current Assets	15,574			16,382
Goodwill	8,958			8,943
Intangible assets, net	2,657			2,975
Fixed assets, net	803			820
Investments	139			165
Other non-current assets	1,174			1,201
TOTAL ASSETS	$	29,305		$	30,486
LIABILITIES AND EQUITY
LIABILITIES
CURRENT LIABILITIES
Fiduciary liabilities	$	11,698		$	12,214
Short-term debt and current portion of long-term debt	1,206			452
Accounts payable and accrued liabilities	1,523			1,853
Other current liabilities	764			831
Total Current Liabilities	15,191			15,350
Long-term debt	3,352			3,713
Pension, other post-retirement and other post-employment liabilities	1,773			2,276
Other non-current liabilities	1,399			1,342
TOTAL LIABILITIES	21,715			22,681
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2013 - 301.0; 2012 - 310.9)	3			3
Additional paid-in capital	4,660			4,436
Retained earnings	5,507			5,933
Accumulated other comprehensive loss	(2,636		)	(2,610		)
TOTAL AON SHAREHOLDERS’ EQUITY	7,534			7,762
Noncontrolling interests	56			43
TOTAL EQUITY	7,590			7,805
TOTAL LIABILITIES AND EQUITY	$	29,305		$	30,486

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

4

Aon plc

Condensed Consolidated Statement 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 December 31, 2012	310.9		$	4,439		$	5,933		$	(2,610	)	$	43		$	7,805
Net income	—		—			758			—			30			788
Shares issued - employee benefit plans	0.7		29			—			—			—			29
Shares issued - employee compensation	5.2		(49		)	—			—			—			(49		)
Shares purchased	(15.8	)	—			(1,025		)	—			—			(1,025		)
Tax benefit - employee benefit plans	—		42			—			—			—			42
Share-based compensation expense	—		207			—			—			—			207
Dividends to shareholders	—		—			(159		)	—			—			(159		)
Net change in fair value of investments	—		—			—			(1		)	—			(1		)
Net change in fair value of derivatives	—		—			—			(12		)	—			(12		)
Net foreign currency translation adjustments	—		—			—			(78		)	1			(77		)
Net post-retirement benefit obligation	—		—			—			65			—			65
Purchase of subsidiary shares from non-controlling interests	—		(5		)	—			—			(6		)	(11		)
Dividends paid to non-controlling interests on subsidiary common stock	—		—			—			—			(12		)	(12		)
Balance at September 30, 2013	301.0		$	4,663		$	5,507		$	(2,636	)	$	56		$	7,590

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

5

Aon plc

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Nine Months Ended
(millions)	September 30, 2013			September 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	788		$	713
Adjustments to reconcile net income to cash provided by operating activities:
Gain from sales of businesses and investments, net	(28		)	(1		)
Depreciation of fixed assets	177			168
Amortization of intangible assets	296			313
Share-based compensation expense	207			160
Deferred income taxes	100			21
Change in assets and liabilities:
Fiduciary receivables	684			(447		)
Short term investments - funds held on behalf of clients	(369		)	118
Fiduciary liabilities	(315		)	329
Receivables, net	374			240
Accounts payable and accrued liabilities	(330		)	(347		)
Restructuring reserves	(7		)	(43		)
Current income taxes	(197		)	67
Pension, other post-retirement and other post-employment liabilities	(401		)	(414		)
Other assets and liabilities	5			(10		)
CASH PROVIDED BY OPERATING ACTIVITIES	984			867
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	81			171
Purchases of long-term investments	(13		)	(9		)
Net (purchases) sales of short-term investments - non-fiduciary	(13		)	66
Acquisition of businesses, net of cash acquired	(26		)	(97		)
Proceeds from sale of businesses	6			2
Capital expenditures	(174		)	(201		)
CASH USED FOR INVESTING ACTIVITIES	(139		)	(68		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025		)	(625		)
Issuance of shares for employee benefit plans	84			93
Issuance of debt	4,270			333
Repayment of debt	(3,870		)	(427		)
Cash dividends to shareholders	(159		)	(153		)
Purchase of shares from noncontrolling interests	(6		)	—
Dividends paid to noncontrolling interests	(13		)	(17		)
CASH USED FOR FINANCING ACTIVITIES	(719		)	(796		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(48		)	15
NET INCREASE IN CASH AND CASH EQUIVALENTS	78			18
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	291			272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	369		$	290
Supplemental disclosures:
Interest paid	$	186		$	172
Income taxes paid, net of refunds	$	330		$	139

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

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Notes to the Condensed Consolidated Financial Statements (Unaudited)

1.  Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).  The Condensed Consolidated Financial Statements include the accounts of Aon plc and all controlled subsidiaries (“Aon” or the “Company”).  All material intercompany accounts and transactions have been eliminated.  The Condensed Consolidated 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 footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  These Condensed Consolidated 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, 2012.  The results for the three and nine months endedSeptember 30, 2013 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2013.

Use of Estimates

The preparation of the accompanying unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, 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, which management believes to be reasonable under the circumstances.  Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency 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 will be reflected in the financial statements in future periods.

2.  Accounting Principles and Practices

Changes in Accounting Principles

Accumulated Other Comprehensive Income

In February 2013, the Financial Accounting Standards Board ("FASB") issued guidance on the disclosure of amounts to be reclassified out of accumulated other comprehensive income. The guidance requires that amounts reclassified out of accumulated other comprehensive income be presented either on the face of the statement of operations or in the notes to the financial statements by component. The guidance was effective for Aon beginning in the first quarter 2013. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Indefinite-Lived Intangible Asset Impairment

In July 2012, the FASB issued guidance on the testing of indefinite-lived intangible assets for impairment that gives an entity the option to perform a qualitative assessment that may eliminate the requirement to perform the annual quantitative test.  The guidance gives an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a an indefinite-lived intangible asset is less than its carrying amount.  If an entity concludes that this is the case, it must perform the quantitative test.  The guidance was effective for Aon beginning in the first quarter 2013.  The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Balance Sheet Offsetting

In December 2011, the FASB issued guidance on the disclosure of offsetting assets and liabilities to enable users of financial statements to evaluate the effect or potential effect of netting arrangements on an entity's financial position. The objective of this disclosure is to facilitate comparison between those entities that prepare their financial statements on the basis of U.S. GAAP and those entities that prepare their financial statements on the basis of IFRS. The guidance requires certain derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and lending transactions to disclose both the gross and net position of these financial instruments. The guidance was effective for Aon beginning in the first quarter

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2013.  The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

3.  Cash and Cash Equivalents

Cash and cash equivalents include cash balances and all highly liquid investments with initial maturities of three months or less.  Short-term investments include certificates of deposit, money market funds and highly liquid debt instruments purchased with initial maturities in excess of three months but less than one year and are carried at amortized cost, which approximates fair value.

The Company is required to hold £77 million of operating funds in the U.K. as required by the Financial Conduct Authority, which were included in Short-term investments.  These operating funds, when translated to U.S. dollars, were $124 million at both September 30, 2013 and December 31, 2012, respectively.  Cash and cash equivalents included restricted balances of $88 million and $76 million at September 30, 2013 and December 31, 2012, respectively. The restricted balances primarily relate to cash required to be held as collateral.

4.  Other Income (Expense)

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

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Equity earnings	$	6		$	—		$	12		$	8
Gains on investments	37			9			36			11
Foreign currency remeasurement (losses) gains	(4		)	(24		)	15			(24		)
Derivative gains (losses)	1			8			(8		)	8
Other	(1		)	(2		)	(1		)	—
	$	39		$	(9	)	$	54		$	3

5.  Acquisitions and Dispositions

Acquisitions

During the nine months ended September 30, 2013, the Company completed the acquisition of five businesses in the Risk Solutions segment and two businesses in the HR Solutions segment.  During the nine months ended September 30, 2012, the Company completed the acquisition of two businesses in the HR Solutions segment and four businesses in the Risk Solutions segment.

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions:

	Nine months ended September 30,
(millions)	2013		2012
Consideration	$	26	$	110
Intangible assets:
Goodwill	$	26	$	60
Other intangible assets	8		56
Total	$	34	$	116

The results of operations of these acquisitions are included in the Condensed Consolidated Financial Statements as of the acquisition date.  The results of operations of the Company would not have been materially different if these acquisitions had been reported from the beginning of the period.

Dispositions

During the nine months ended September 30, 2013, the Company completed the sale of five businesses in the Risk Solutions segment. A pretax gain of $0.2 million was recognized on these sales, which is included in Other income (expense) in the

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Condensed Consolidated Statements of Income. During the nine months ended September 30, 2012, the Company completed the sale of two businesses in the Risk Solutions segment and one business in the HR Solutions segment.  A pretax gain of $1 million was recognized on these sales, which is included in Other income (expense) in the Condensed Consolidated Statements of Income.

6.  Goodwill and Other Intangible Assets

The change in the net carrying amount of goodwill by reportable segment for the nine months ended September 30, 2013 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2012	$	5,982		$	2,961		$	8,943
Goodwill related to current year acquisitions	24			2			26
Goodwill related to disposals	(3		)	—			(3		)
Goodwill related to prior year acquisitions	(2		)	17			15
Foreign currency translation	(19		)	(4		)	(23		)
Balance as of September 30, 2013	$	5,982		$	2,976		$	8,958

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

	September 30, 2013						December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,025	$	—	$	1,025	$	1,025	$	—	$	1,025
Intangible assets with finite lives:
Customer related and contract based	2,686		1,218		1,468		2,714		969		1,745
Marketing, technology and other (1)	611		447		164		619		414		205
	$	4,322	$	1,665	$	2,657	$	4,358	$	1,383	$	2,975

 ______________________________________________

(1) Tradenames with finite lives disclosed separately in prior years are now presented in Marketing, technology and other

Amortization expense from finite lived intangible assets was $98 million and $296 million for the three and nine months endedSeptember 30, 2013, respectively. Amortization expense from finite lived intangible assets was $105 million and $313 million for the three and nine months endedSeptember 30, 2012, respectively.

The estimated future amortization for finite lived intangible assets as of September 30, 2013 is as follows (in millions):

	HR Solutions		Risk Solutions		Total
Remainder of 2013	$	70	$	28	$	98
2014	243		95		338
2015	212		79		291
2016	177		67		244
2017	140		56		196
Thereafter	342		123		465
	$	1,184	$	448	$	1,632

7.  Restructuring

Aon Hewitt Restructuring Plan

On October 14, 2010, Aon announced a global restructuring plan (“Aon Hewitt Plan”) in connection with the acquisition of Hewitt Associates, Inc. ("Hewitt").  The Aon Hewitt Plan is intended to streamline operations across the combined Aon Hewitt organization, the Health & Benefits organization and shared services and facility rationalization across the Company. The Aon

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Hewitt Plan includes approximately 2,900 job eliminations. The Company expects these restructuring activities and related expenses to affect operations through the end of 2013.  The Aon Hewitt Plan is expected to result in cumulative costs of approximately $411 million through the end of the plan, consisting of approximately $261 million in employee termination costs and approximately $150 million in real estate rationalization costs across the Company.

From the inception of the Aon Hewitt Plan through September 30, 2013, approximately 2,660 jobs have been eliminated and total expenses of $364 million have been incurred.  The Company recorded $30 million and $109 million of restructuring and related charges in the three and nine months endedSeptember 30, 2013, respectively. The Company recorded $32 million and $57 million of restructuring and related charges in the three and nine months endedSeptember 30, 2012, respectively. Charges related to the restructuring are included in Compensation and benefits and Other general expenses in the accompanying Condensed Consolidated Statements of Income.

The following table summarizes restructuring and related costs by type that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
Workforce reduction	$	49	$	64	$	74	$	12	$	50	$	237	$	261
Lease consolidation	3		32		18		17		53		106		128
Asset impairments	—		7		4		—		3		14		15
Other costs associated with restructuring (2)	—		2		2		1		3		7		7
Total restructuring expenses	$	52	$	105	$	98	$	30	$	109	$	364	$	411

 ______________________________________________

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this 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.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

The following table summarizes the restructuring and related expenses, by segment, that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
HR Solutions	$	52	$	49	$	66	$	6	57		$	224	$	244
Risk Solutions	—		56		32		24		52		140		167
Total restructuring expenses (1)	$	52	$	105	$	98	$	30	$	109	$	364	$	411

______________________________________________

(1) Costs included in the Risk Solutions segment are associated with the transfer of the health and benefits consulting business from HR Solutions to Risk Solutions effective January 1, 2012. Costs incurred in 2011 in the HR Solutions segment of $41 million related to the health and benefits consulting business have been reclassified and presented in the Risk Solutions segment.

As of September 30, 2013, the Company’s liabilities for its restructuring plans are as follows (in millions):

	Aon Hewitt Plan			Aon Benfield Plan			2007 Plan			Other			Total
Balance at December 31, 2012	$	96		$	3		$	35		$	3		$	137
Expensed	106			—			—			—			106
Cash payments	(91		)	(1		)	(20		)	(1		)	(113		)
Foreign exchange translation and other	7			—			6			—			13
Balance at September 30, 2013 (1)	$	118		$	2		$	21		$	2		$	143

  ______________________________________________

(1) Included within Accounts payable and accrued liabilities and Other non-current liabilities

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8.  Investments

The Company earns income on cash balances and investments, as well as on premium trust balances that the Company maintains for premiums collected from insureds but not yet remitted to insurance companies, and funds held under the terms of certain outsourcing agreements to pay certain obligations on behalf of clients.  Premium trust balances and receivables, as well as a corresponding liability, are included in Fiduciary assets and Fiduciary liabilities in the accompanying Condensed Consolidated Statements of Financial Position.

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	September 30, 2013		December 31, 2012
Cash and cash equivalents	$	369	$	291
Short-term investments	357		346
Fiduciary assets (1)	4,335		4,029
Investments	139		165
	$	5,200	$	4,831

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

The Company’s investments are as follows (in millions):

	September 30, 2013		December 31, 2012
Equity method investments	$	113	$	102
Other investments (2)	17		43
Fixed-maturity securities (3)	9		20
	$	139	$	165

  ______________________________________________

(2) The reduction in other investments is due to the sale of certain equity securities.

(3) The reduction in fixed-maturity securities is due to the repayment in full of a security.

9.  Debt

The Company uses proceeds from the commercial paper market from time to time in order to meet short-term working capital needs and from time to time to retire other debt obligations.  At September 30, 2013, the Company had $511 million in commercial paper outstanding as compared to $50 million of commercial paper outstanding at December 31, 2012. The increase was largely attributable to the use of commercial paper proceeds to repay the remaining balance outstanding of the term credit loan facility due October 2013. The weighted average commercial paper outstanding for the three and nine months endedSeptember 30, 2013 was $524 million and $349 million, respectively. The weighted average interest rate of the commercial paper outstanding for the three and nine months endedSeptember 30, 2013 was 0.33% and 0.35%, respectively.

During the quarter ended September 30, 2013, the €500 million ($674 million) debt securities due July 2014 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statements of Financial Position as the date of maturity is less than one year.

On March 8, 2013, the Company issued $90 million in aggregate principal amount of 4.250% Notes Due 2042. The 4.250% Notes Due 2042 constitute a further issuance of, and were consolidated to form a single series of debt securities with, the $166 million aggregate principal amount of the 4.250% Notes Due 2042 issued by Aon plc on December 12, 2012 (collectively, the "Original Notes"). The Original Notes were unconditionally guaranteed as to the payment of principal and interest by Aon Corporation.

On April 15, 2013, an S-4 registration statement registering $256 million in aggregate principal amount of 4.250% Notes Due 2042 (the "Exchange Notes") under the Securities Act of 1933, as amended (the "Securities Act"), was declared effective by the Securities and Exchange Commission. The Exchange Notes were exchanged for the Original Notes. The form and terms of the Exchange Notes are substantially identical in all material respects to those of the Original Notes except that the Exchange Notes are registered under the Securities Act and the transfer restrictions, registration rights and related additional interest provisions applicable to the Original Notes do not apply to the Exchange Notes. Like the Original Notes, the Exchange Notes

11

were issued by Aon plc and unconditionally guaranteed by Aon Corporation. All Original Notes were exchanged for Exchange Notes in the second quarter 2013.

On April 29, 2013, the Company amended its Euro Facility agreement to add Aon plc as an additional borrower. On May 8, 2013, the Company established a multi-currency commercial paper program in aggregate principal amount of up to €650 million. Aon Corporation is a guarantor under the program.

On May 21, 2013, the Company issued $250 million in aggregate principal amount of 4.45% Notes Due 2043. The 4.45% Notes Due 2043 were issued by Aon plc and fully and unconditionally guaranteed by Aon Corporation. The Company used the proceeds of the issuance to repay commercial paper borrowings and for general corporate purposes.

10.  Shareholders’ Equity

Ordinary Shares

In April 2012, the Company’s Board of Directors authorized a share repurchase program under which up to $5.0 billion of Class A Ordinary Shares may be repurchased (“2012 Share Repurchase Program”). Under this program, 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.

In the third quarter of 2013, the Company repurchased 7.3 million shares at an average price per share of $68.33 for a total cost of $500 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2013, the Company repurchased 15.8 million shares at an average price per share of $64.79 for a total cost of $1.0 billion under the 2012 Share Repurchase Program.  In the third quarter of 2012, the Company repurchased 5.4 million shares at an average price per share of $51.37 for a total cost of $275 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2012, the Company repurchased 12.7 million shares at an average price per share of $49.22 for a total cost of $625 million under the 2012 Share Repurchase Program and the previously completed 2010 Share Repurchase Program. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $3.0 billion. Since the inception of the 2012 Share Repurchase Program, the Company repurchased a total of 35.3 million shares for an aggregate cost of $2.0 billion.

Participating Securities

Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, are participating securities, as defined, and therefore, should be included in computing basic and diluted earnings per share using the two class method.  Certain of the Company’s restricted share awards allow the holder to receive a non-forfeitable dividend equivalent.

Income from continuing operations, income from discontinued operations and net income, attributable to participating securities, were as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Income from continuing operations	$	3	$	2	$	8	$	8
Income from discontinued operations	—		—		—		—
Net income	$	3	$	2	$	8	$	8

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

	Three months ended September 30,		Nine months ended September 30,
	2013	2012	2013	2012
Shares for basic earnings per share (1)	309.5	327.3	313.2	330.6
Common stock equivalents	3.4	3.7	3.5	3.8
Shares for diluted earnings per share	312.9	331.0	316.7	334.4

   ______________________________________________

(1) Includes 3.8 million and 4.5 million of participating securities for the three months ended September 30, 2013 and 2012, respectively, and 4.0 million and 4.7 million of participating securities for the nine months ended September 30, 2013 and 2012, respectively.

Certain ordinary share equivalents were not included in the computation of diluted net income per share because their inclusion would have been antidilutive.  There were no shares excluded from the calculation for the three and nine months ended September 30, 2013. The number of shares excluded from the calculation was 0.1 million for both the three and nine months ended September 30, 2012, respectively.

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 Investments (1)			Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments			Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2012	$	—		$	(28	)	$	233		$	(2,815	)	$	(2,610	)
Other comprehensive income (loss) before reclassifications, net	12			(24		)	(78		)	(4		)	(94		)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	(20		)	20			—			100			100
Tax benefit	7			(8		)	—			(31		)	(32		)
Amounts reclassified from accumulated other comprehensive loss, net	(13		)	12			—			69			68
Net current period other comprehensive (loss) income	(1		)	(12		)	(78		)	65			(26		)
Balance at September 30, 2013	$	(1	)	$	(40	)	$	155		$	(2,750	)	$	(2,636	)

______________________________________________

(1) Reclassifications from Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from Accumulated other comprehensive loss are recorded in Compensation and benefits

11.  Employee Benefits

The following table provides the components of the net periodic benefit cost for Aon’s U.S. pension plans, along with its most significant international pension plans, which are located in the U.K., the Netherlands and Canada (in millions):

	Three months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	5		$	4		$	—		$	—
Interest cost	63			66			28			29
Expected return on plan assets	(89		)	(80		)	(34		)	(31		)
Amortization of net actuarial loss	18			15			13			10
Net periodic (benefit) cost	$	(3	)	$	5		$	7		$	8

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	Nine months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	14		$	12		$	—		$	—
Interest cost	189			198			84			89
Expected return on plan assets	(267		)	(241		)	(103		)	(95		)
Amortization of net actuarial loss	55			44			39			32
Net periodic (benefit) cost	$	(9	)	$	13		$	20		$	26

Based on current assumptions, in 2013, Aon plans to contribute $167 million and $381 million to its U.S. and most significant international defined benefit pension plans, respectively. During the three months ended September 30, 2013, contributions of $54 million were made to the Company's U.S. pension plans and $59 million were made to its most significant international pension plans. During the nine months ended September 30, 2013, contributions of $122 million were made to the Company’s U.S. pension plans and $290 million were made to its most significant international pension plans.

12.  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,
	2013		2012		2013		2012
Restricted stock units (“RSUs”)	$	40	$	37	$	135	$	120
Performance share awards (“PSAs”)	28		15		66		30
Stock options	—		1		1		4
Employee stock purchase plans	2		2		5		6
Total stock-based compensation expense	$	70	$	55	$	207	$	160

Share Awards

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	10,432		$	44	9,916		$	42
Granted	3,598		62		4,888		46
Vested	(3,618	)	44		(3,343	)	42
Forfeited	(308	)	47		(516	)	44
Non-vested at end of period	10,104		51		10,945		44

 ______________________________________________

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

The vesting of PSAs is contingent upon meeting various individual, divisional or company-wide performance conditions, including revenue generation, or growth in revenue, pretax income or earnings per share over a one to five-year period. The performance conditions are not considered in the determination of the grant date fair value for these awards. The fair value of PSAs is based upon the market price of an Aon ordinary share at the date of grant. Compensation expense is recognized over the performance period, and in certain cases an additional vesting period, based on management's estimate of the number of units expected to vest. Compensation expense is adjusted to reflect the actual number of shares issued at the end of the programs. The actual issue of shares may range from 0-200% of the target number of PSAs granted, based on the plan. Dividend equivalents are not paid on PSAs.

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Information as of September 30, 2013 regarding 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, 2013 and the years ended December 31, 2012 and 2011, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of September 30, 2013		As of December 31, 2012		As of December 31, 2011
Target PSAs granted	1,135		1,369		1,715
Fair value (1)	$	58	$	47	$	50
Number of shares that would be issued based on current performance levels	1,135		2,232		1,386
Unamortized expense, based on current performance levels	$	53	$	46	$	5

 ______________________________________________

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

Share Options

The Company did not grant any share options during the nine months ended September 30, 2013 or 2012, respectively.

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	5,611		$	32	9,116		$	32
Granted	—				—		—
Exercised	(1,694	)	32		(2,570	)	31
Forfeited and expired	(29	)	34		(67	)	37
Outstanding at end of period	3,888		32		6,479		32
Exercisable at end of period	3,681		32		5,969		31

The weighted average remaining contractual life, in years, of outstanding options was 2.2 years and 2.8 years at September 30, 2013 and 2012, respectively.

The aggregate intrinsic value represents the total pretax intrinsic value, based on options with an exercise price less than the Company’s closing stock price of $74.44 as of September 30, 2013, which would have been received by the option holders had those option holders exercised their options as of that date.  At September 30, 2013, the aggregate intrinsic value of options outstanding was $163 million, of which $156 million was exercisable.

Other information related to the Company’s share options is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Aggregate intrinsic value of stock options exercised	$	14	$	23	$	53	$	47
Cash received from the exercise of stock options	14		29		55		80
Tax benefit realized from the exercise of stock options	3		5		10		8

Unamortized deferred compensation expense, which includes both options and awards, amounted to $373 million as of September 30, 2013, with a remaining weighted-average amortization period of approximately 2.1 years.

13.  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.

15

Foreign Exchange Risk Management

The Company is exposed to foreign exchange risk when it receives revenues, pays expenses, or enters into intercompany loans denominated in a currency that differs from its functional currency, or other transactions that are denominated in a currency other than 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 two years; however, in limited instances, the Company has hedged certain exposures up to five years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to hedge its net investments in foreign operations for up to two years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to manage 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, for up to one year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income in the Condensed Consolidated Statements of Income.

Interest Rate Risk Management

The Company holds variable-rate short-term brokerage and other operating deposits. The Company uses interest rate derivatives, typically swaps, to reduce its exposure to the effects of interest rate fluctuations on the forecasted interest receipts from these deposits for up to two years in the future.

Certain derivatives also give rise to credit risks from the possible non-performance by counterparties.  The credit risk at the balance sheet date is generally limited to the fair value of those contracts that are favorable to the Company.  The Company has reduced its credit risk by using International Swaps and Derivatives Association (“ISDA”) master agreements, collateral and credit support arrangements, entering into non-exchange-traded derivatives with highly-rated major financial institutions and by using exchange-traded instruments.  The Company monitors the creditworthiness of, and exposure to, its counterparties.  As of September 30, 2013, all net derivative positions were free of credit risk contingent features.  The Company has not received or pledged any collateral related to derivative arrangements as of September 30, 2013.

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

	Notional Amount				Derivative Assets				Derivative Liabilities
	September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	169	$	336	$	8	$	17	$	—	$	—
Foreign exchange contracts	1,159		1,208		56		191		112		250
Total	1,328		1,544		64		208		112		250
Derivatives not accounted for as hedges:
Foreign exchange contracts	267		305		1		2		1		1
Total	$	1,595	$	1,849	$	65	$	210	$	113	$	251

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Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	8	$	17	$	—		$	—		$	8	$	17
Foreign exchange contracts	56		191		(25		)	(160		)	31		31
Total	64		208		(25		)	(160		)	39		48
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		2		(1		)	—			—		2
Total	$	65	$	210	$	(26	)	$	(160	)	$	39	$	50

______________________________________________

(1) Included within Other current assets or Other non-current assets

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	112		250		(25		)	(160		)	87		90
Total	112		250		(25		)	(160		)	87		90
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		1		(1		)	—			—		1
Total	$	113	$	251	$	(26	)	$	(160	)	$	87	$	91

______________________________________________

(2) Included within Other current liabilities or Other non-current liabilities

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The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three and nine months endedSeptember 30, 2013 and 2012 are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:
Cash Flow Hedges:
Interest rate contracts	$	—		$	—		$	—		$	—
Foreign exchange contracts	—			16			(28		)	(14		)
Total	$	—		$	16		$	(28	)	$	(14	)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	3		$	—		$	4
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):
Cash Flow Hedges:
Interest rate contracts (1)	$	—		$	—		$	(1	)	$	—
Foreign exchange contracts (2)	(10		)	(7		)	(7		)	(23		)
Total	(10		)	(7		)	(8		)	(23		)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	—		$	—		$	—

  ______________________________________________

(1) Included within Fiduciary investment income and Interest expense

(2) Included within Other income (expense) and Interest expense

	Three months ended September 30,										Nine months ended September 30,
	Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)						Amount of Gain (Loss) Recognized in Income on Related Hedge Item (2)				Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)					Amount of Gain (Loss) Recognized in Income on Related Hedge Item (1) (2)
	2013			2012			2013		2012		2013			2012		2013		2012
Fair value hedges:
Interest rate contracts	$	(7	)	$	(3	)	$	7	$	3	$	(8	)	$	—	$	8	$	—

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

The Company estimates that approximately $27 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

The amount of gain (loss) recognized in income on the ineffective portion of derivatives for the three and nine months endedSeptember 30, 2013 and 2012 was not material.

During the three and nine months endedSeptember 30, 2013, the Company recorded a gain of $3 million and a loss of $15 million, respectively, in Other income (expense) for foreign exchange derivatives not designated or qualifying as hedges. During the three and nine months endedSeptember 30, 2012, the Company recorded a gain of $6 million and $12 million, respectively, in Other income (expense) for foreign exchange derivatives not designated or qualifying as hedges. 

14.  Fair Value 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;

18

• 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 and highly liquid debt securities are carried at cost and amortized cost, respectively, as an approximation of fair value. Based on market convention, the Company considers cost a practical and expedient measure of fair value.

Cash, cash equivalents, and highly liquid debt instruments consist of cash and institutional short-term investment funds. The Company independently reviews the short-term investment funds to obtain reasonable assurance the fund net asset value is $1 per share.

Equity investments consist of domestic and international equity securities and exchange traded 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 equity security and volatility. The Company independently reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and on a sample basis, 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 a detailed understanding of the models, inputs, and assumptions used in developing prices provided by its vendors. This understanding includes discussions with valuation resources at the vendor. During these discussions, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the pricing vendor and 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 a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates used in the Condensed Consolidated Financial Statements.

Pooled funds consist of various equity, fixed income, commodity, and real estate mutual fund type investment vehicles. Pooled investment funds fair value is estimated based on the proportionate share ownership in the underlying net assets of the investment, which is based on the fair value of the underlying securities that trade on a national securities exchange. Where possible, the Company independently reviews the listing securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the fund and discusses fund performance with pooled fund managers. The Company obtains audited fund manager financial statements, when available. If the pooled fund is designed to replicate a publicly traded index, the Company compares the performance of the fund to the index to assess the reasonableness of the fair value measurement.

Alternative investments consist of limited partnerships, private equity and hedge funds. Alternative investment fair value is generally estimated based on the proportionate share ownership in the underlying net assets of the investment as determined by the general partner or investment manager. The valuations are based on various factors depending on investment strategy, proprietary models, and specific financial data or projections. The Company obtains audited fund manager financial statements, when available. The Company obtains a detailed understanding of the models, inputs and assumptions used in developing prices provided by the investment managers (or appropriate party) through regular discussions. During these discussions with the investment managers, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the investment manager and 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 a member of management and the fair value estimate provided by the vendor is adjusted, if

19

deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates in the Condensed Consolidated 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.

Annuity contracts consist of insurance group annuity contracts purchased to match the pension benefit payment stream owed to certain selected plan participant demographics within a few major United Kingdom defined benefit plans. Annuity contracts are valued using a discounted cash flow model utilizing assumptions such as discount rate, mortality, and inflation. The Company independently verifies the observable inputs.

Real estate and REITs consist of publicly traded REITs and direct real estate investments. Level 1 REITs are valued using the closing stock price on a national securities exchange. The Level 3 values are based on the proportionate share of ownership in the underlying net asset value as determined by the investment manager. The Company independently reviews the listing of Level 1 REIT securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the Level 3 real estate funds and discusses performance with the fund managers. The Company obtains audited fund manager financial statements, when available. See the description of “Alternative investments” for further detail on valuation procedures surrounding Level 3 REITs.

Guarantees are carried at fair value, which is based on discounted estimated cash flows using published historical cumulative default rates and discount rates commensurate with the underlying exposure.

Debt is carried at outstanding principal balance, less any unamortized 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, 2013 and December 31, 2012 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2013		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 and highly liquid debt securities (1)	$	2,098	$	2,073	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	9		5		4		—
Derivatives:
Interest rate contracts	8		—		8		—
Foreign exchange contracts	57		—		57		—
Liabilities:
Derivatives:
Foreign exchange contracts	113		—		113		—

  ______________________________________________

(1) Includes $2,073 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

20

			Fair Value Measurements Using
	Balance at December 31, 2012		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 and highly liquid debt securities (1)	$	2,133	$	2,108	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	12		—		—		12
Government Bonds	8		—		8		—
Equity securities	5		5		—		—
Derivatives:
Interest rate contracts	17		—		17		—
Foreign exchange contracts	193		—		193		—
Liabilities:
Derivatives:
Foreign exchange contracts	251		—		251		—

  ______________________________________________

(1)  Includes $2,108 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

There were no transfers of assets or liabilities between fair value hierarchy levels in the three and nine months endedSeptember 30, 2013 and 2012, respectively. The Company recognized $6 million of realized gains and no unrealized gains during the three and nine months endedSeptember 30, 2013, respectively, related to assets and liabilities measured at fair value using unobservable inputs. There were no realized or unrealized gains or losses recognized in the Condensed Consolidated Statements of Income or Financial Position during either the three or nine months ended September 30, 2012 related to assets and liabilities measured at fair value using unobservable inputs.

The fair value of all long-term debt instruments is classified as Level 2. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,352	$	3,583	$	3,713	$	4,162

15.  Commitments and 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. Aon has historically purchased E&O insurance and other insurance 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 historical claims. Accruals for these exposures, and related insurance receivables, when applicable, have been provided to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Amounts related to settlement provisions are recorded in Other general expenses in the Condensed Consolidated Statements of Income.

A retail insurance brokerage subsidiary of Aon provides insurance brokerage services to Northrop Grumman Corporation (“Northrop”). This Aon subsidiary placed Northrop’s excess property insurance program for the period covering 2005. Northrop suffered a substantial loss in August 2005 when Hurricane Katrina damaged Northrop’s facilities in the Gulf states. Northrop’s excess insurance carrier, Factory Mutual Insurance Company (“Factory Mutual”), denied coverage for the claim pursuant to a flood exclusion. Northrop sued Factory Mutual in the United States District Court for the Central District of

21

California and later sought to add this Aon subsidiary as a defendant, asserting that if Northrop’s policy with Factory Mutual does not cover the losses suffered by Northrop stemming from Hurricane Katrina, then this Aon subsidiary will be responsible for Northrop’s losses. On August 26, 2010, the court granted in large part Factory Mutual’s motion for partial summary judgment regarding the applicability of the flood exclusion and denied Northrop’s motion to add this Aon subsidiary as a defendant in the federal lawsuit. On January 27, 2011, Northrop filed suit against this Aon subsidiary in state court in Los Angeles, California, pleading claims for negligence, breach of contract and negligent misrepresentation. Northrop has since settled with Factory Mutual. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Another retail insurance brokerage subsidiary of Aon has been sued in Tennessee state court by a client, Opry Mills Mall Limited Partnership (“Opry Mills”) that sustained flood damage to its property in May 2010. The lawsuit seeks $200 million from numerous insurers with whom this Aon subsidiary placed the client’s property insurance coverage. The insurers contend that only $50 million in coverage is available for the loss because the flood event occurred on property in a high hazard flood zone. Opry Mills is seeking full coverage from the insurers for the loss and has sued this Aon subsidiary in the alternative for the same $150 million difference on various theories of professional liability if the court determines there is not full coverage. In addition, Opry Mills seeks prejudgment interest, attorneys' fees and enhanced damages which could substantially increase Aon's exposure. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

A pensions consulting and administration subsidiary of Hewitt prior to its acquisition by Aon provided advisory services to the Trustees of the Philips UK pension fund and the relevant employer of fund beneficiaries (together, “Philips”). In December 2011, the Aon subsidiary received notice of a potential claim alleging negligence and breach of duty. The notice asserts Philips’ right to claim damages related to Philips’ use of a credit default swap hedging strategy pursuant to the supply of the advisory services, which is said to have resulted in substantial damages to Philips. No lawsuit has yet been filed. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this circumstance, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Mazeikiu Nafta ("MN"), which operates an oil refinery in Lithuania, has sued an insurance brokerage subsidiary of Aon in London. Aon placed property damage and business interruption coverage for MN. There was a fire at the refinery in 2006. MN settled with insurers in November 2011 and claimed against Aon in December 2012. The claim is for $125 million, which is the shortfall alleged by MN to have been caused by Aon's failure to obtain appropriate business interruption coverage. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

From time to time, Aon’s clients may bring claims and take legal action pertaining to the performance of fiduciary responsibilities. Whether client claims and legal action related to the Company’s performance of fiduciary responsibilities are founded or unfounded, if such claims and legal actions are resolved in a manner unfavorable to the Company, they may adversely affect Aon’s financial results and materially impair the market perception of the Company and that of its products and services.

Although the ultimate outcome of all matters referred to above cannot be ascertained, and liabilities in indeterminate amounts may be imposed on Aon or its subsidiaries, on the basis of present information, amounts already provided, availability of insurance coverages and legal advice received, it is the opinion of management that the disposition or ultimate determination of such claims will not have a material adverse effect on the consolidated financial position of Aon. However, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by an unfavorable resolution of these matters.

Guarantees and Indemnifications

In connection with the redomicile of Aon's headquarters ("the Redomestication"), the Company on April 2, 2012 entered 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), (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)

22

(4) First Supplemental Indenture, dated as of April 2, 2012, among Aon Finance N.S. 1, ULC, as issuer, Aon Corporation, as guarantor, Aon plc, as guarantor, and Computershare Trust Company of Canada, as trustee, and (5) Amended and Restated Trust Deed, among Aon Corporation, Aon plc, Aon Services Luxembourg & Co S.C.A. (formerly known as Aon Financial Services Luxembourg S.A.) (“Aon Luxembourg”) and BNY Mellon Corporate Trustee Services Limited, as trustee (the “Luxembourg Trustee”) (amending and restating the Trust Deed, dated as of July 1, 2009, as amended and restated on January 12, 2011, among Aon Delaware, Aon Luxembourg and the Luxembourg Trustee).

Effective as of the same date, the Company also entered into agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under the (1) $450,000,000 Term Credit Agreement dated June 15, 2011, among Aon Corporation, as borrower, Bank of America, N.A., as administrative agent and the other agents and lenders party thereto, (2) $400,000,000Five-Year Agreement dated March 20, 2012, among Aon Corporation, as borrower, Citibank, N.A., as administrative agent and the other agents and lenders party thereto and (3) €650,000,000 Facility Agreement, dated October 15, 2010, among Aon Corporation, the subsidiaries of Aon Corporation party thereto as borrowers, Citibank International plc, as agent, and the other agents and lenders party thereto, as amended on July 18, 2011.

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 that are deemed to be probable and reasonably estimable are included in the Company’s Condensed Consolidated Financial Statements.

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

Letters of Credit

The Company had total letters of credit (“LOCs”) outstanding for approximately $71 million at September 30, 2013, as compared to $74 million at December 31, 2012. These letters of credit 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 issued LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries. Amounts are accrued in the Condensed Consolidated Financial Statements to the extent the guarantees are probable and estimable.

Commitments

The Company has provided commitments to fund certain limited partnerships in which it has an interest in the event that the general partners request funding. Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $35 million at September 30, 2013. During the three and nine months endedSeptember 30, 2013, the Company funded $7 million and $13 million, respectively of these commitments.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. Costs associated with these guarantees, to the extent estimable and probable, are provided in Aon’s allowance for doubtful accounts. The maximum exposure with respect to such contractual contingent guarantees was approximately $81 million at September 30, 2013 as compared to $104 million at December 31, 2012.

16. Segment Information

The Company has two reportable segments:  Risk Solutions and HR Solutions.  Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Condensed Consolidated Financial Statements.

Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon’s chief operating decision-maker (“CODM”) uses financial information for the purposes of allocating resources and evaluating performance.  The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices.  The Company does not present net assets by segment as this information is not reviewed by the CODM.

23

Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon’s global distribution network.

HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Aon’s total revenue is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	1,821		$	1,778		$	5,736		$	5,582
HR Solutions	981			971			2,891			2,847
Intersegment elimination	(8		)	(12		)	(21		)	(30		)
Total revenue	$	2,794		$	2,737		$	8,606		$	8,399

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Retail brokerage	$	1,424		$	1,390		$	4,548		$	4,395
Reinsurance brokerage	389			377			1,167			1,156
Total Risk Solutions Segment	1,813			1,767			5,715			5,551
Consulting services	406			394			1,176			1,140
Outsourcing	587			585			1,746			1,723
Intrasegment	(12		)	(8		)	(31		)	(16		)
Total HR Solutions Segment	981			971			2,891			2,847
Intersegment	(8		)	(12		)	(21		)	(30		)
Total commissions, fees and other revenue	$	2,786		$	2,726		$	8,585		$	8,368

Fiduciary investment income by segment is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Risk Solutions	$	8	$	11	$	21	$	31
HR Solutions	—		—		—		—
Total fiduciary investment income	$	8	$	11	$	21	$	31

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	333		$	309		$	1,127		$	1,059
HR Solutions	75			80			162			211
Segment income before income taxes	408			389			1,289			1,270
Unallocated expenses	(44		)	(50		)	(133		)	(135		)
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other income (expense)	39			(9		)	54			3
Income before income taxes	$	353		$	274		$	1,063		$	971

Unallocated expenses include administrative or other costs not attributable to the operating segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of worldwide debt obligations.

24

Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency transactions.

17.  Guarantee of Registered Securities

As described in Note 15, 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. Aon Corporation is a 100% directly owned subsidiary of Aon plc. The debt securities that are subject to Rule 3-10 of Regulation S-X are the 3.50% senior notes due September 2015, the 3.125% senior notes due May 2016, the 5.00% senior notes due September 2020, the 8.205% junior subordinated deferrable interest debentures due January 2027 and the 6.25% senior notes due September 2040. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the debt.

Aon Corporation entered into an agreement pursuant to which it agreed to guarantee the obligations of Aon plc arising under the 4.250% Notes Due 2042 exchanged for Aon Corporation's outstanding 8.205% junior subordinated deferrable interest debentures due January 2027 in both Original Notes and Exchange Notes form as described in Note 9. Those notes are subject to Rule 3-10 of Regulation S-X. Aon Corporation also agreed to guarantee the obligations of Aon plc arising under the 4.45% Notes Due 2043 issued on May 21, 2013. 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 4.250% Notes Due 2042 or the 4.45% Notes Due 2043.

The following tables set forth condensed consolidating statements of income for the three and nine months endedSeptember 30, 2013 and 2012, condensed consolidating statements of comprehensive income for the three and nine months endedSeptember 30, 2013 and 2012, condensed consolidating statements of financial position as of September 30, 2013 and December 31, 2012, and condensed consolidating statements of cash flows for the nine months ended September 30, 2013 and 2012 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 non-guarantor subsidiaries. The condensed consolidating financial statements are presented in all periods as a merger under common control, with Aon plc presented as the parent company in all periods prior and subsequent to the Redomestication. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

In July 2013, Aon Holdings LLC, an intermediate holding company and the direct parent of Aon Corporation, transferred its ownership of Aon Corporation to Aon plc via distribution. The financial results of Aon Holdings LLC were included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has reflected the transfer of Aon Corporation from Aon Holdings LLC to Aon plc below for all periods presented.

25

Condensed Consolidating Statement of Income

	Three months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,785		$	—		$	2,786
Fiduciary investment income	—			—			8			—			8
Total revenue	1			—			2,793			—			2,794
Expenses
Compensation and benefits	11			14			1,641			—			1,666
Other general expenses	—			5			759			—			764
Total operating expenses	11			19			2,400			—			2,430
Operating (loss) income	(10		)	(19		)	393			—			364
Interest income	—			1			2			—			3
Interest expense	(6		)	(39		)	(8		)	—			(53		)
Intercompany interest income (expense)	25			11			(36		)	—			—
Other income	—			13			26			—			39
Income (loss) from continuing operations before taxes	9			(33		)	377			—			353
Income tax (benefit) expense	(2		)	(14		)	105			—			89
Income (loss) from continuing operations	11			(19		)	272			—			264
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	245			127			—			(372		)	—
Net income	256			108			272			(372		)	264
Less: Net income attributable to noncontrolling interests	—			—			8			—			8
Net income attributable to Aon shareholders	$	256		$	108		$	264		$	(372	)	$	256

26

Condensed Consolidating Statement of Income

	Three months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	2,726		$	—		$	2,726
Fiduciary investment income	—			—			11			—			11
Total revenue	—			—			2,737			—			2,737
Expenses
Compensation and benefits	4			(5		)	1,621			—			1,620
Other general expenses	19			6			753			—			778
Total operating expenses	23			1			2,374			—			2,398
Operating (loss) income	(23		)	(1		)	363			—			339
Interest income	—			—			1			—			1
Interest expense	—			(45		)	(12		)	—			(57		)
Intercompany interest (expense) income	(8		)	48			(40		)	—			—
Other income (expense)	—			10			(19		)	—			(9		)
(Loss) income from continuing operations before taxes	(31		)	12			293			—			274
Income tax (benefit) expense	(3		)	16			51			—			64
(Loss) income from continuing operations	(28		)	(4		)	242			—			210
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	232			186			—			(418		)	—
Net income	204			182			242			(418		)	210
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income attributable to Aon shareholders	$	204		$	182		$	236		$	(418	)	$	204

27

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	2		$	—		$	8,583		$	—		$	8,585
Fiduciary investment income	—			—			21			—			21
Total revenue	2			—			8,604			—			8,606
Expenses
Compensation and benefits	27			34			5,042			—			5,103
Other general expenses	14			29			2,304			—			2,347
Total operating expenses	41			63			7,346			—			7,450
Operating (loss) income	(39		)	(63		)	1,258			—			1,156
Interest income	1			2			3			—			6
Interest expense	(12		)	(106		)	(35		)	—			(153		)
Intercompany interest income (expense)	11			96			(107		)	—			—
Other income	—			10			44			—			54
(Loss) income from continuing operations before taxes	(39		)	(61		)	1,163			—			1,063
Income tax (benefit) expense	(11		)	(24		)	310			—			275
(Loss) income from continuing operations	(28		)	(37		)	853			—			788
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	786			617			—			(1,403		)	—
Net income	758			580			853			(1,403		)	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758

28

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	8,368		$	—		$	8,368
Fiduciary investment income	—			1			30			—			31
Total revenue	—			1			8,398			—			8,399
Expenses
Compensation and benefits	—			31			4,889			—			4,920
Other general expenses	20			27			2,297			—			2,344
Total operating expenses	20			58			7,186			—			7,264
Operating (loss) income	(20		)	(57		)	1,212			—			1,135
Interest income	—			1			5			—			6
Interest expense	—			(125		)	(48		)	—			(173		)
Intercompany interest (expense) income	(11		)	141			(130		)	—			—
Other income (expense)	—			13			(10		)	—			3
(Loss) income from continuing operations before taxes	(31		)	(27		)	1,029			—			971
Income tax (benefit) expense	(4		)	(11		)	272			—			257
(Loss) income from continuing operations	(27		)	(16		)	757			—			714
Loss from discontinued operations before taxes	—			—			(1		)	—			(1		)
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			(1		)	—			(1		)
Equity in earnings of subsidiaries, net of tax	715			598			—			(1,313		)	—
Net income	688			582			756			(1,313		)	713
Less: Net income attributable to noncontrolling interests	—			—			25			—			25
Net income attributable to Aon shareholders	$	688		$	582		$	731		$	(1,313	)	$	688

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Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2013
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	256	$	108		$	272		$	(372	)	$	264
Less: Net income attributable to noncontrolling interests	—		—			8			—			8
Net income attributable to Aon shareholders	$	256	$	108		$	264		$	(372	)	$	256
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		(4		)	(10		)	—			(14		)
Change in fair value of derivatives	—		2			7			—			9
Foreign currency translation adjustments	—		6			149			—			155
Post-retirement benefit obligation	—		7			17			—			24
Total other comprehensive income	—		11			163			—			174
Equity in other comprehensive loss of subsidiaries, net of tax	170		157			—			(327		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			3			—			3
Total other comprehensive income attributable to Aon shareholders	170		168			160			(327		)	171
Comprehensive income attributable to Aon shareholders	$	426	$	276		$	424		$	(699	)	$	427

Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor			Consolidating
(millions)	plc		Corporation		Subsidiaries			Adjustments			Consolidated
Net income	$	204	$	182	$	242		$	(418	)	$	210
Less: Net income attributable to noncontrolling interests	—		—		6			—			6
Net income attributable to Aon shareholders	$	204	$	182	$	236		$	(418	)	$	204
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—		—		—			—			—
Change in fair value of derivatives	—		1		14			—			15
Foreign currency translation adjustments	—		17		147			—			164
Post-retirement benefit obligation	—		9		(2		)	—			7
Total other comprehensive income	—		27		159			—			186
Equity in other comprehensive income of subsidiaries, net of tax	182		168		—			(350		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		4			—			4
Total other comprehensive income attributable to Aon shareholders	182		195		155			(350		)	182
Comprehensive income attributable to Aon Shareholders	$	386	$	377	$	391		$	(768	)	$	386

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Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	758		$	580		$	853		$	(1,403	)	$	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—			—			(1		)	—			(1		)
Change in fair value of derivatives	—			5			(17		)	—			(12		)
Foreign currency translation adjustments	—			(14		)	(63		)	—			(77		)
Post-retirement benefit obligation	—			22			43			—			65
Total other comprehensive income (loss)	—			13			(38		)	—			(25		)
Equity in other comprehensive loss of subsidiaries, net of tax	(27		)	(38		)	—			65			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			1			—			1
Total other comprehensive loss attributable to Aon shareholders	(27		)	(25		)	(39		)	65			(26		)
Comprehensive income attributable to Aon shareholders	$	731		$	555		$	784		$	(1,338	)	$	732

Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
Net income	$	688	$	582	$	756	$	(1,313	)	$	713
Less: Net income attributable to noncontrolling interests	—		—		25		—			25
Net income attributable to Aon shareholders	$	688	$	582	$	731	$	(1,313	)	$	688
Other comprehensive income, net of tax:
Change in fair value of investments	—		—		—		—			—
Change in fair value of derivatives	—		1		4		—			5
Foreign currency translation adjustments	—		16		55		—			71
Post-retirement benefit obligation	—		24		22		—			46
Total other comprehensive income	—		41		81		—			122
Equity in other comprehensive income of subsidiaries, net of tax	120		92		—		(212		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		2		—			2
Total other comprehensive income attributable to Aon shareholders	120		133		79		(212		)	120
Comprehensive income attributable to Aon Shareholders	$	808	$	715	$	810	$	(1,525	)	$	808

31

Condensed Consolidating Statement of Financial Position

	As of September 30, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	118	$	291	$	—	$	(40	)	$	369
Short-term investments	—		124		233		—			357
Receivables, net	—		5		2,661		—			2,666
Fiduciary assets	—		—		11,698		—			11,698
Intercompany receivables	41		3,250		6,176		(9,467		)	—
Other current assets	19		59		406		—			484
Total Current Assets	178		3,729		21,174		(9,507		)	15,574
Goodwill	—		—		8,958		—			8,958
Intangible assets, net	—		—		2,657		—			2,657
Fixed assets, net	—		—		803		—			803
Investments	—		53		86		—			139
Intercompany receivables	7,166		2,181		2,195		(11,542		)	—
Other non-current assets	119		748		408		(101		)	1,174
Investment in subsidiary	4,306		11,187		—		(15,493		)	—
TOTAL ASSETS	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,698	$	—		$	11,698
Short-term debt and current portion of long-term debt	361		148		697		—			1,206
Accounts payable and accrued liabilities	16		41		1,506		(40		)	1,523
Intercompany payables	1,308		4,727		3,430		(9,465		)	—
Other current liabilities	1		47		718		(2		)	764
Total Current Liabilities	1,686		4,963		18,049		(9,507		)	15,191
Long-term debt	443		2,516		393		—			3,352
Pension, other post-retirement and other post-employment liabilities	—		1,162		611		—			1,773
Intercompany payables	2,100		7,262		2,180		(11,542		)	—
Other non-current liabilities	6		260		1,234		(101		)	1,399
TOTAL LIABILITIES	4,235		16,163		22,467		(21,150		)	21,715
TOTAL AON SHAREHOLDERS’ EQUITY	7,534		1,735		13,758		(15,493		)	7,534
Noncontrolling interests	—		—		56		—			56
TOTAL EQUITY	7,534		1,735		13,814		(15,493		)	7,590
TOTAL LIABILITIES AND EQUITY	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305

32

Condensed Consolidating Statement of Financial Position

	As of December 31, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	131	$	199	$	—	$	(39	)	$	291
Short-term investments	—		89		257		—			346
Receivables, net	5		1		3,095		—			3,101
Fiduciary assets	—		—		12,214		—			12,214
Intercompany receivables	—		2,092		3,545		(5,637		)	—
Other current assets	7		53		370		—			430
Total Current Assets	143		2,434		19,481		(5,676		)	16,382
Goodwill	—		—		8,943		—			8,943
Intangible assets, net	—		—		2,975		—			2,975
Fixed assets, net	—		—		820		—			820
Investments	—		49		116		—			165
Intercompany receivables	166		1,997		2,350		(4,513		)	—
Other non-current assets	117		735		1,174		(825		)	1,201
Investment in subsidiary	10,398		10,208		—		(20,606		)	—
TOTAL ASSETS	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,214	$	—		$	12,214
Short-term debt and current portion of long-term debt	—		429		23		—			452
Accounts payable and accrued liabilities	10		71		1,811		(39		)	1,853
Intercompany payables	51		2,637		2,162		(4,850		)	—
Other current liabilities	—		49		779		3			831
Total Current Liabilities	61		3,186		16,989		(4,886		)	15,350
Long-term debt	107		2,515		1,091		—			3,713
Pension, other post-retirement and other post-employment liabilities	—		1,294		982		—			2,276
Intercompany payables	2,890		166		2,247		(5,303		)	—
Other non-current liabilities	4		254		1,909		(825		)	1,342
TOTAL LIABILITIES	3,062		7,415		23,218		(11,014		)	22,681
TOTAL AON SHAREHOLDERS’ EQUITY	7,762		8,008		12,598		(20,606		)	7,762
Noncontrolling interests	—		—		43		—			43
TOTAL EQUITY	7,762		8,008		12,641		(20,606		)	7,805
TOTAL LIABILITIES AND EQUITY	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486

33

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2013
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	(14	)	$	(195	)	$	1,193		$	—		$	984
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			8			73			—			81
Purchase of long-term investments	—			(13		)	—			—			(13		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(35		)	22			—			(13		)
Acquisition of businesses, net of cash acquired	—			—			(26		)	—			(26		)
Proceeds from sale of businesses	—			—			6			—			6
Capital expenditures	—			—			(174		)	—			(174		)
CASH USED FOR INVESTING ACTIVITIES	—			(40		)	(99		)	—			(139		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025		)	—			—			—			(1,025		)
Advances from (to) affiliates	405			610			(1,014		)	(1		)	—
Issuance of shares for employee benefit plans	84			—			—			—			84
Issuance of debt	1,145			2,894			231			—			4,270
Repayment of debt	(449		)	(3,177		)	(244		)	—			(3,870		)
Cash dividends to shareholders	(159		)	—			—			—			(159		)
Purchase of shares from noncontrolling interests	—			—			(6		)	—			(6		)
Dividends paid to noncontrolling interests	—			—			(13		)	—			(13		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	1			327			(1,046		)	(1		)	(719		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(48		)	—			(48		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(13		)	92			—			(1		)	78
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	118		$	291		$	—		$	(40	)	$	369

34

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH (USED FOR) PROVIDED BY OPERATING ACTIVITIES	$	(46	)	$	(189	)	$	1,102		$	—	$	867
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			79			92			—		171
Purchase of long-term investments	—			(9		)	—			—		(9		)
Net (purchases) sales of short-term investments - non-fiduciary	(16		)	61			21			—		66
Acquisition of businesses, net of cash acquired	—			(55		)	(42		)	—		(97		)
Proceeds from sale of businesses	—			—			2			—		2
Capital expenditures	—			—			(201		)	—		(201		)
CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES	(16		)	76			(128		)	—		(68		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(525		)	(100		)	—			—		(625		)
Advances from (to) affiliates	648			376			(1,024		)	—		—
Issuance of shares for employee benefit plans	44			49			—			—		93
Issuance of debt	—			332			1			—		333
Repayment of debt	—			(416		)	(11		)	—		(427		)
Cash dividends to shareholders	(104		)	(49		)	—			—		(153		)
Purchase of shares from noncontrolling interests	—			—			—			—		—
Dividends paid to noncontrolling interests	—			—			(17		)	—		(17		)
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES	63			192			(1,051		)	—		(796		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			15			—		15
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1			79			(62		)	—		18
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			(21		)	293			—		272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	1		$	58		$	231		$	—	$	290

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

EXECUTIVE SUMMARY OF THIRD QUARTER 2013 FINANCIAL RESULTS

On April 2, 2012, we completed the Redomestication, moving our corporate headquarters to London. In the Redomestication, each issued and outstanding share of Aon Corporation common stock held by stockholders of Aon Corporation was converted into the right to receive one Class A Ordinary Share, nominal value $0.01 per share, of Aon plc. In connection with the Redomestication, we have incurred costs related to the headquarters relocation of $1 million and $5 million in the three and nine months endedSeptember 30, 2013, respectively. We believe the Redomestication will strengthen our long term strategy by:

• Enabling Risk Solutions to deliver superior value to our clients by executing our Aon Broking strategy;

• Expanding the HR Solutions portfolio penetration, especially within consulting, which already has a significant presence in the UK and EMEA;

• Enhancing our Risk Solutions’ relationship with, and integration into, London markets;

• Increasing our connection to emerging markets, accelerating our ability to grow there, and further aligning our strategy with underwriters and carriers who are also targeting these high growth markets;

• Strengthening our international brand awareness and positioning as a global firm;

• Advancing our talent strategy through better development, retention and acquisition of professional talent, with a special focus on London’s insurance talent;

• Optimizing our fiscal planning and capital allocation and reducing our global tax rate in a manner that provides us with the increased financial flexibility to properly invest in our growth.

During the first nine months of 2013, we continued to face certain headwinds impacting our business. In our Risk Solutions segment, these included economic weakness in continental Europe and a continued decline in investment income. In our HR Solutions segment, these included price compression in our benefits administration business and a decline in demand for discretionary services in Consulting.

The following is a summary of our third quarter and first nine months of 2013 financial results:

• For the quarter, revenue increased $57 million, or 2%, to $2.8 billion when compared to the prior year quarter of $2.7 billion. This was the result of 3% organic revenue growth, partially offset by a $3 million, or 27%, decline in investment income due to lower average interest rates globally. Organic revenue growth was 4% in the Risk Solutions segment and flat in the HR Solutions segment during the quarter. During the first nine months of 2013, revenue increased$207 million, or 2%, to $8.6 billion due primarily to 3% organic revenue growth, partially offset by a 1% unfavorable impact from foreign exchange rates. Organic revenue growth was 4% in the Risk Solutions segment and 1% in the HR Solutions segment during the first nine months of 2013.

• Operating expenses for the quarter were $2.4 billion, an increase of $32 million, or 1%, when compared to the prior year quarter of $2.4 billion. Operating expenses for the first nine months of 2013 were $7.5 billion, an increase of $186 million, or 3%, over the prior year. The increase in both periods is primarily the result of a 3% organic revenue growth. The increase of $32 million for the quarter also included $10 million of additional errors and omissions expenses when compared to the prior year quarter and $8 million of expenses from acquisitions, partially offset by a $22 million favorable impact from foreign currency exchange rates if current rates were used to translate prior year results, savings related to the restructuring programs, and a $7 million decline in intangible asset amortization. The first nine months included a $44 million increase in restructuring costs and $20 million of legacy, non-recurring claims handling charges, partially offset by a $43.5 million favorable impact from settlement of a non-recurring one-time legal matter, a $17 million decrease in intangible asset amortization expense, and savings related to the formal restructuring programs.

• Operating margin from continuing operations increased to 13.0% in the third quarter 2013 from 12.4% in the third quarter 2012. The nine month operating margin was 13.4% as compared to 13.5% in 2012. The decrease in operating margin for the first nine months is primarily related to an increase in restructuring costs, significant investments in long-term growth opportunities and an unfavorable revenue mix shift in HR Solutions.  

• Net income from continuing operations attributable to Aon shareholders increased$52 million or 25%, to $256 million for the third quarter 2013 as compared to the third quarter 2012. During the first nine months of 2013, Net income from continuing operations attributable to Aon shareholders increased$69 million, or 10%, compared to the first nine months of 2012 to $758 million.  

36

• Cash flow provided by operating activities for the quarter of $597 million was essentially flat as compared to the cash flow provided by operating activities of $598 million in the prior year quarter, due primarily to a decrease in pension contributions and strong underlying working capital performance, offset by an increase in cash paid for taxes and the timing of certain interest payments. Cash flow provided by operating activities was $984 million for the first nine months of 2013, an increase of $117 million, or 13%, from cash flow provided by operating activities of $867 million in the first nine months of 2012 primarily driven by working capital improvements. Cash flow from operations in the first nine months of 2013 was also favorably impacted by the $43.5 million settlement of a non-recurring, one-time legal matter.

We focus on four key metrics each quarter that we communicate to shareholders: grow organically, expand margins, increase earnings per share, and increase free cash flow.  The following is our measure of performance against these four metrics for the third quarter and first nine months of 2013:

• Organic revenue growth, a non-GAAP measure as defined under the caption “Review of Consolidated Results — General” below, was 3% in both the third quarter and first nine months of 2013 as compared to the prior year third quarter and first nine months organic revenue growth of 4%. Organic revenue growth in the third quarter was primarily driven by strong management of the renewal book portfolio across all regions and solid new business growth in New Zealand, Asia, and emerging markets in our Retail business. Strong growth in Reinsurance and solid growth across our consulting business also contributed to organic growth.

• Adjusted operating margin, a non-GAAP measure as defined under the caption “Review of Consolidated Results — General” below, for the third quarter 2013 was 17.6% for Aon overall, 21.1% for the Risk Solutions segment, and 15.4% for the HR Solutions segment.  Adjusted operating margin was 17.5% for Aon overall, 20.0% for the Risk Solutions segment, and 17.5% for the HR Solutions segment for the third quarter 2012.  For the first nine months of 2013, adjusted operating margin was 18.2% for Aon overall, 22.1% for the Risk Solutions segment, and 14.8% for the HR Solutions segment. For the first nine months of 2012, adjusted operating margin was 18.3% for Aon overall, 21.1% for the Risk Solutions segment, and 16.5% for the HR Solutions segment. The quarter-to-date increase in adjusted operating margin for the Risk Solutions segment reflects strong revenue growth and savings related to the restructuring programs, which was partially offset by unfavorable impact from foreign currency translation and a decline in fiduciary investment income. The quarter-to-date decrease in adjusted operating margin for the HR Solutions segment reflects investment in long-term growth opportunities and an unfavorable revenue mix shift in our benefits administration business.

• Adjusted diluted earnings per share from continuing operations attributable to Aon’s shareholders, a non-GAAP measure as defined under the caption “Review of Consolidated Results — General” below, was $1.13 per share in the third quarter of 2013 and $3.35 per share for the first nine months of 2013, compared to $0.95 and $2.94 per share in the third quarter and first nine months of 2012, respectively.

• Free cash flow, a non-GAAP measure as defined under the "Review of Consolidated Results - General" below, was $545 million for the quarter, an increase of $19 million, or 4%, from $526 million in the prior year quarter, driven by a reduction in capital expenditures. Free cash flow was $810 million in the first nine months of 2013, an increase of $144 million, or 22%, from $666 million in the first nine months of 2012. The increase in free cash flow from the prior year was driven by improved cash flow from operations and a decrease of $27 million, or 13%, in capital expenditures from the prior year period.

REVIEW OF CONSOLIDATED RESULTS

General

In our discussion of operating results, we sometimes refer to 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.

Organic Revenue

We use supplemental information related to organic revenue to help us and our investors evaluate business growth from existing operations.  Organic revenue excludes the impact of foreign exchange rate changes, acquisitions, divestitures, transfers between business units, fiduciary investment income, reimbursable expenses, and certain unusual items.  Supplemental

37

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 Condensed Consolidated Financial Statements and Notes thereto.  Industry peers provide similar supplemental information about their revenue performance, although they may not make identical adjustments.  Reconciliation of this non-GAAP measure, organic revenue growth percentages, to the reported Commissions, fees and other revenue growth percentages, has been provided in the “Review by Segment” caption, below.

Adjusted Operating Margins

We use adjusted operating margin as a measure of core operating performance of our Risk Solutions and HR Solutions segments.  Adjusted operating margin excludes the impact of certain items, including restructuring charges, intangible asset amortization and headquarters relocation costs. 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 Condensed Consolidated Financial Statements and Notes thereto.

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

	Three months ended September 30, 2013
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	2,794		$	1,821		$	981
Operating income — U.S. GAAP	$	364		$	333		$	75
Restructuring charges	30			24			6
Intangible asset amortization	98			28			70
Headquarters relocation costs	1			—			—
Operating income — as adjusted	$	493		$	385		$	151
Operating margins — U.S. GAAP	13.0		%	18.3		%	7.6		%
Operating margins — as adjusted	17.6		%	21.1		%	15.4		%

	Nine months ended September 30, 2013
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	8,606		$	5,736		$	2,891
Operating income — U.S. GAAP	$	1,156		$	1,127		$	162
Restructuring charges	109			52			57
Intangible asset amortization	296			86			210
Headquarters relocation costs	5			—			—
Operating income — as adjusted	$	1,566		$	1,265		$	429
Operating margins — U.S. GAAP	13.4		%	19.6		%	5.6		%
Operating margins — as adjusted	18.2		%	22.1		%	14.8		%

	Three months ended September 30, 2012
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	2,737		$	1,778		$	971
Operating income — U.S. GAAP	$	339		$	309		$	80
Restructuring charges	32			16			16
Intangible asset amortization	105			31			74
Headquarters relocation costs	4			—			—
Operating income — as adjusted	$	480		$	356		$	170
Operating margins — U.S. GAAP	12.4		%	17.4		%	8.2		%
Operating margins — as adjusted	17.5		%	20.0		%	17.5		%

38

	Nine months ended September 30, 2012
	Total Aon (1)			Risk Solutions			HR Solutions
Revenue — U.S. GAAP	$	8,399		$	5,582		$	2,847
Operating income — U.S. GAAP	$	1,135		$	1,059		$	211
Restructuring charges	65			29			36
Intangible asset amortization	313			91			222
Headquarters relocation costs	21			—			—
Operating income — as adjusted	$	1,534		$	1,179		$	469
Operating margins — U.S. GAAP	13.5		%	19.0		%	7.4		%
Operating margins — as adjusted	18.3		%	21.1		%	16.5		%

  ______________________________________________

(1) Includes unallocated expenses and the elimination of inter-segment revenue.

Adjusted Diluted Earnings per Share

We also use adjusted diluted earnings per share as a non-GAAP measure of our core operating performance. Adjusted diluted earnings per share excludes the impact of restructuring charges, intangible asset amortization, and headquarters relocation costs, along with related income taxes. 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 Condensed Consolidated Financial Statements and Notes thereto. Reconciliations of this non-GAAP measure to the reported diluted earnings per share are as follows (in millions except per share data): 

	Three months ended September 30, 2013
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	364		$	129	$	493
Interest income	3			—		3
Interest expense	(53		)	—		(53		)
Other income	39			—		39
Income from continuing operations before income taxes	353			129		482
Income taxes	89			33		122
Income from continuing operations	264			96		360
Less: Net income attributable to noncontrolling interests	8			—		8
Income from continuing operations attributable to Aon stockholders	$	256		$	96	$	352
Diluted earnings per share from continuing operations	$	0.82		$	0.31	$	1.13
Weighted average common shares outstanding — diluted	312.9			312.9		312.9

	Nine months ended September 30, 2013
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	1,156		$	410	$	1,566
Interest income	6			—		6
Interest expense	(153		)	—		(153		)
Other income	54			—		54
Income from continuing operations before income taxes	1,063			410		1,473
Income taxes	275			107		382
Income from continuing operations	788			303		1,091
Less: Net income attributable to noncontrolling interests	30			—		30
Income from continuing operations attributable to Aon stockholders	$	758		$	303	$	1,061
Diluted earnings per share from continuing operations	$	2.39		$	0.96	$	3.35
Weighted average common shares outstanding — diluted	316.7			316.7		316.7

39

	Three months ended September 30, 2012
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	339		$	141	$	480
Interest income	1			—		1
Interest expense	(57		)	—		(57		)
Other income	(9		)	2		(7		)
Income from continuing operations before income taxes	274			143		417
Income taxes	64			34		98
Income from continuing operations	210			109		319
Less: Net income attributable to noncontrolling interests	6			—		6
Income from continuing operations attributable to Aon stockholders	$	204		$	109	$	313
Diluted earnings per share from continuing operations	$	0.62		$	0.33	$	0.95
Weighted average common shares outstanding — diluted	331.0			331.0		331.0

	Nine months ended September 30, 2012
	U.S. GAAP			Adjustments		As Adjusted
Operating income	$	1,135		$	399	$	1,534
Interest income	6			—		6
Interest expense	(173		)	—		(173		)
Other income	3			2		5
Income from continuing operations before income taxes	971			401		1,372
Income taxes	257			107		364
Income from continuing operations	714			294		1,008
Less: Net income attributable to noncontrolling interests	25			—		25
Income from continuing operations attributable to Aon stockholders	$	689		$	294	$	983
Diluted earnings per share from continuing operations	$	2.06		$	0.88	$	2.94
Weighted average common shares outstanding — diluted	334.4			334.4		334.4

Free Cash Flow

We use free cash flow, defined as cash flow provided by operations minus capital expenditures, as a measure of our core operating performance. 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 Condensed Consolidated Financial Statements and Notes thereto. The use of this non-GAAP measure does not imply or represent the residual cash flow for discretionary expenditures.

	Nine months ended September 30,
	2013			2012
Cash flow provided by operations - U.S. GAAP	$	984		$	867
Less: Capital expenditures	(174		)	(201		)
Free cash flow	$	810		$	666

Impact of Foreign Exchange Rate Fluctuations

Because we conduct business in more than 120 countries, foreign exchange rate fluctuations have a significant impact on our business.  In comparison to the U.S. dollar, 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 more meaningful information about our operations, we have provided a discussion 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 last year’s revenue, expenses and net income at this year’s foreign exchange rates.  Currency fluctuations had an unfavorable impact of $0.02 and $0.01 during the three and nine months endedSeptember 30, 2013, respectively, on adjusted net income from continuing operations per diluted share when we translate prior year quarter results at current quarter foreign exchange rates.

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Summary of Results

Our consolidated results of operations follow (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Revenue:
Commissions, fees and other	$	2,786		$	2,726		$	8,585		$	8,368
Fiduciary investment income	8			11			21			31
Total revenue	2,794			2,737			8,606			8,399
Expenses:
Compensation and benefits	1,666			1,620			5,103			4,920
Other general expenses	764			778			2,347			2,344
Total operating expenses	2,430			2,398			7,450			7,264
Operating income	364			339			1,156			1,135
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other income	39			(9		)	54			3
Income from continuing operations before income taxes	353			274			1,063			971
Income taxes	89			64			275			257
Income from continuing operations	264			210			788			714
Loss from discontinued operations, after tax	—			—			—			(1		)
Net income	264			210			788			713
Less: Net income attributable to noncontrolling interests	8			6			30			25
Net income attributable to Aon stockholders	$	256		$	204		$	758		$	688

Revenue

Revenue increased by $57 million, or 2%, in the third quarter 2013 compared to the third quarter 2012, and increased$207 million, or 2%, on a year-to-date basis.  The third quarter increase consists of a $10 million, or 1%, increase in the HR Solutions segment and a $43 million, or 2%, increase in the Risk Solutions segment. Organic revenue growth in the HR Solutions segment for the quarter was flat, primarily driven by growth in investment, compensation and communications consulting, partially offset by an anticipated decline in benefits administration.  The results of the Risk Solutions segment reflect 4% organic revenue growth, partially offset by a decrease in Fiduciary investment income. The increase in the Risk Solutions segment compared to the prior year quarter was primarily driven strong management of the renewal book portfolio across all regions, solid new business growth in New Zealand, Asia, and emerging markets and a strong quarter of growth in our Reinsurance business.

Revenue for the nine months ended September 30, 2013increased$207 million from the comparable period due to a $44 million, or 2%, increase in HR Solutions and a $154 million, or 3%, increase in Risk Solutions partially offset by a $10 milliondecrease in Fiduciary investment income. Organic revenue growth in HR Solutions was 1% compared to the first nine months of 2012. The 3%increase in the Risk Solutions segment reflects 4% organic revenue growth, partially offset by an unfavorable impact of 1% from foreign exchange rates.

Compensation and Benefits

Compensation and benefits increased$46 million, or 3%, from third quarter 2012. For the first nine months 2013, Compensation and benefits increased$183 million, or 4%, from the comparable prior year period. For the quarter ended September 30, 2013, the increase in Compensation and benefits was primarily driven by organic revenue growth and the inclusion of $6 million of costs related to acquisitions, partially offset by a $14 million favorable impact from foreign currency translation and restructuring savings. For the nine months ended September 30, 2013, the increase in Compensation and benefits was primarily driven by organic revenue growth, the inclusion of $21 million of costs related to acquisitions and

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investments in key talent, partially offset by a $37 million favorable impact from foreign currency translation and restructuring savings.

Other General Expenses

Other general expenses for the three and nine month periods ended September 30, 2013, decreased$14 million, or 2%, and increased$3 million, or essentially flat, respectively, compared to the prior year. The decrease for the three month period ended September 30, 2013 included an $8 million favorable impact from foreign currency translation, intangible amortization expense decrease of $7 million, and savings from formal restructuring plans, partially offset by a $10 million increase in formal restructuring costs. The increase for the nine months ended September 30, 2013 included a $43.5 million favorable impact from settlement of a non-recurring one-time legal matter, a $22 million favorable impact from foreign currency translation, intangible amortization expense decrease of $17 million, and savings from formal restructuring plans, partially offset by a $43 million increase in formal restructuring costs and $20 million of legacy, non-recurring claims handling charges.

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 2013, Interest income increased$2 million to $3 million in the third quarter 2013 as compared to the third quarter 2012. During the first nine months of 2013, Interest income remained flat as compared to the same period in 2012. The increase during the third quarter is due to a higher average level of cash balances. The third quarter impact was offset in the year to date period by lower average interest rates globally.

Interest expense

Interest expense, for the third quarter and first nine months of 2013, which represents the cost of our worldwide debt obligations, decreased$4 million and $20 million from the third quarter and the first nine months of 2012, respectively. The decrease in interest expense reflects a decline in the average rate on total debt outstanding.

Other income (expense)

Other income (expense) was $39 million income and $54 million income for the third quarter and first nine months of 2013, respectively, as compared to $9 million expense and $3 million income for the third quarter and the first nine months of 2012, respectively.  The third quarter 2013 includes a $37 million gains on investments and equity earnings of $6 million, partially offset by a $4 million loss on foreign currency remeasurement. The first nine months of 2013 include a $36 million gain on investments, a $15 million gain on foreign currency remeasurement and equity earnings of $12 million, partially offset by an $8 million loss from derivatives. The third quarter 2012 includes a $24 million loss on foreign currency remeasurement, partially offset by an $8 million hedging gain and a $9 million gain on investments. The first nine months of 2012 include an $11 million gain on investments, equity earnings of $8 million, and an $8 million hedging gain, partially offset by a $24 million loss on foreign currency remeasurement.

Income from Continuing Operations before Income Taxes

Income from continuing operations before income taxes for the third quarter was $353 million, a 29%increase from $274 million in 2012.  For the first nine months of 2013, Income from continuing operations before income taxes was $1.1 billion, a 9%increase from $971 million in 2012. For both periods, the increase in income was driven by the 3% increase in organic growth, expense discipline, and increased benefits from restructuring initiatives.

Income Taxes

The effective tax rate on income from continuing operations was 25.1% and 23.2% for the quarters ended September 30, 2013 and 2012, respectively, and 25.9% and 26.5% for the nine months ended September 30, 2013 and 2012, respectively. The effective tax rate in the third quarters of 2013 and 2012 were impacted by certain discrete tax adjustments. We continue to expect that over time, our effective tax rate on net income from continuing operations will decrease. The actual effective tax rate in any particular period, however, will depend upon discrete tax adjustments and changes in the geographic distribution of income.

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Income from Continuing Operations Attributable to Aon Shareholders

Income from continuing operations attributable to Aon shareholders for the third quarter increased to $256 million, or $0.82 diluted net income per share, from $204 million, or $0.62 diluted net income per share, in 2012. During the first nine months of 2013, Income from continuing operations attributable to Aon shareholders increased to $758 million, or $2.39 diluted net income per share, from $689 million, or $2.06 diluted net income per share, in 2012.

Restructuring Initiatives

Aon Hewitt Restructuring Plan

On October 14, 2010, we announced a global restructuring plan in connection with the acquisition of Hewitt.  The Aon Hewitt Plan is intended to streamline operations across the combined Aon Hewitt organization, the Health & Benefits organization and shared services and facility rationalization across the company. The Aon Hewitt Plan includes approximately 2,900 job eliminations. We expect these restructuring activities and related expenses to affect continuing operations through the end of 2013.  The Aon Hewitt Plan is expected to result in cumulative costs of approximately $411 million through the end of the plan, consisting of approximately $261 million in employee termination costs and approximately $150 million in real estate rationalization across the Company.

From the inception of the Aon Hewitt Plan through September 30, 2013, approximately 2,660 jobs have been eliminated and total expenses of $364 million have been incurred.  We recorded $30 million and $109 million of restructuring and related charges in the three and nine months endedSeptember 30, 2013, respectively.  We recorded $32 million and $57 million of restructuring and related charges in the three and nine months endedSeptember 30, 2012, respectively. Charges related to the restructuring are included in Compensation and benefits and Other general expenses in the accompanying Condensed Consolidated Statements of Income.

The following summarizes the restructuring and related costs, by type, that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total Inception to Date		Estimated Total Cost for Restructuring Plan (1)
Workforce reduction	$	49	$	64	$	74	$	12	$	50	$	237	$	261
Lease consolidation	3		32		18		17		53		106		128
Asset impairments	—		7		4		—		3		14		15
Other costs associated with restructuring (2)	—		2		2		1		3		7		7
Total restructuring and related expenses	$	52	$	105	$	98	$	30	$	109	$	364	$	411

 ______________________________________________

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this plan.  Significant assumptions likely to 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 us to add or cancel component initiatives.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

The following summarizes the restructuring and related expenses, by segment, that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total Inception to Date		Estimated Total Cost for Restructuring Plan (1)
HR Solutions	$	52	$	49	$	66	$	6	$	57	$	224	$	244
Risk Solutions	—		56		32		24		52		140		167
Total restructuring and related expenses	$	52	$	105	$	98	$	30	$	109	$	364	$	411

  ______________________________________________

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(1) Costs included in the Risk Solutions segment are associated with the transfer of the health and benefits consulting business from HR Solutions to Risk Solutions effective January 1, 2012. Costs incurred in 2011 in the HR Solutions segment of $41 million related to the health and benefits consulting business have been reclassified and presented in the Risk Solutions segment.

The restructuring plan, before any potential reinvestment of savings, is expected to deliver approximately $325 million of annual savings in 2013. The HR Solutions segment is expected to deliver $258 million of annual savings, with the remaining $67 million to be delivered by the Risk Solutions segment. We estimate that we realized approximately $88 million and $235 million in restructuring cost savings in the third quarter and first nine months of 2013, respectively.  The Company expects to achieve approximately $378 million cumulative savings by the end of 2014 from the formal restructuring program in addition to synergy savings achieved in areas such as information technology, procurement and public company costs.  Actual total savings, costs and timing may vary from those estimated due to changes in the scope or assumptions underlying the plan.

LIQUIDITY AND FINANCIAL CONDITION

Liquidity

Executive Summary

We believe that our balance sheet and strong cash flow provide us with financial flexibility to create long-term value for our shareholders.  Our primary sources of liquidity are cash flow from operations, available cash reserves and debt capacity available under various credit facilities.  Our primary uses of liquidity are operating expenses, capital expenditures, acquisitions, share repurchases, restructuring initiatives, funding pension obligations and shareholder dividends.

Cash on our balance sheet includes funds available for general corporate purposes.  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 Statement of Financial Position, with a corresponding amount in Fiduciary liabilities. Fiduciary funds cannot be used for general corporate purposes, and should not be considered as a source of liquidity for us.

Operating Activities

Net cash provided by operating activities during the nine months ended September 30, 2013 was $984 million as compared to net cash provided by operating activities during the nine months ended September 30, 2012 of $867 million, an increase of $117 million. The primary driver of the cash provided by operating activities was net income, adjusted for non-cash expenses, of $1.5 billion and a decrease in accounts receivable of $374 million, partially offset by a decrease in accounts payable and accrued liabilities of $330 million, and pension contributions of $401 million. Net cash provided by operating activities was favorably impacted by a $43.5 million settlement of a non-recurring, one-time legal matter. Pension contributions were $401 million and $414 million for the nine months ended September 30, 2013 and 2012, respectively. For the remainder of 2013, we expect to contribute approximately $147 million to our pension plans, with the majority attributable to non-U.S. pension plans, which are subject to changes in foreign exchange rates.

We expect cash generated by operations for 2013 to be sufficient to service our debt and contractual obligations, fund the cash requirements of our restructuring programs, finance capital expenditures, continue acquisitions of shares under our share repurchase program, and continue to pay dividends to our shareholders.  Although cash from operations is expected to be sufficient to service these obligations, we have the ability to borrow under our credit facilities to accommodate any timing differences in cash flows.  We have committed credit facilities of approximately $1.3 billion, of which all was available at September 30, 2013.  We can access these facilities on a same day or next day basis.  Additionally, we believe that we could access capital markets to obtain debt financing for longer-term funding, under current market conditions, if needed.

Investing Activities

Cash flow used for investing activities was $139 million during the nine months ended September 30, 2013. The primary drivers of the cash flow used for investing activities were $174 million for capital expenditures, partially offset by $68 million for net sales of long term investments. The cash flows provided by the net sales of long term investments represent the cash proceeds generated from net sales of long term investments where the corresponding gains and losses are recognized in Other income (expense) in the Condensed Consolidated Statements of Income.

Cash flow used for investing activities was $68 million during the nine months ended September 30, 2012. The primary drivers of the cash flow used for investing activities were $201 million for capital expenditures and $95 million for acquisitions, net of

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sales, partially offset by $162 million in net sales of long-term investments and $66 million in net sales of short-term investments.

Financing Activities

Cash flow used for financing activities during the nine months ended September 30, 2013 was $719 million. The primary drivers of cash flow used for financing activities were share repurchases of $1.0 billion and dividends paid to shareholders of $159 million, partially offset by issuances of debt, net of repayments, of $400 million and proceeds from the exercise of share options and issuance of shares purchased through the employee stock purchase plan of $84 million.

Cash flow used for financing activities during the nine months ended September 30, 2012 was $796 million. The primary drivers of cash flow used for financing activities were share repurchases of $625 million, dividends paid to shareholders of $153 million, and repayments of debt, net of issuances, of $94 million partially offset by proceeds from the exercise of share options and issuance of shares purchased through the employee stock purchase plan of $93 million.

As a U.K. incorporated company, Aon plc must have “distributable reserves” to make share repurchases or pay dividends to shareholders. Distributable reserves may be created through the earnings of the U.K. parent company and, amongst other methods, through a reduction in share capital approved by the English Companies Court. Distributable reserves are not linked to a U.S. GAAP reported amount. As of September 30, 2013, we had distributable reserves in excess of $5.6 billion. We believe that we will have sufficient distributable reserves to fund shareholder dividends for the foreseeable future.

Cash and Investments

At September 30, 2013, our cash and cash equivalents and short-term investments were $726 million, an increase of $89 million from December 31, 2012.  Of the total balance as of September 30, 2013, $212 million was restricted as to its use, which was comprised of $124 million of operating funds in the U.K. as required by the Financial Conduct Authority and $88 million held as collateral for various business purposes.  At September 30, 2013, $498 million of cash and cash equivalents and short-term investments were held in the U.S. and $228 million was held in other countries. Of the total balance as of December 31, 2012, $200 million was restricted as to its use, which was comprised of $124 million of operating funds in the U.K. as required by the Financial Conduct Authority and $76 million held as collateral for various business purposes. At December 31, 2012, $138 million of cash and cash equivalents and short-term investments were held in the U.S. and $499 million was held in other countries.

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 underwriter.  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 the premiums, claims and refunds, make payments to underwriters and insureds, collect funds from clients and make payments on their behalf, and foreign currency movements.  Fiduciary assets, because of their nature, are required to be invested in very liquid securities with highly-rated, credit-worthy financial institutions.  In our Condensed Consolidated Statements of Financial Position, the amount we report for Fiduciary assets and Fiduciary liabilities are equal.  Our Fiduciary assets included cash and investments of $4.3 billion and $4.0 billion and fiduciary receivables of $7.4 billion and $8.2 billion at September 30, 2013 and December 31, 2012, respectively.  While we earn investment income on the fiduciary assets held in cash and investments, the cash and investments are not owned by us, and cannot be used for general corporate purposes.

As disclosed in Note 14 “Fair Value and Financial Instruments,” of the Notes to the Condensed Consolidated Financial Statements, the majority of our investments carried at fair value are money market funds.  Money market funds are carried at cost as an approximation of fair value.  Consistent with market convention, we consider cost a practical and expedient measure of fair value.  These money market funds are held throughout the world with various financial institutions.  We do not believe that there are any market liquidity issues that would materially impact the fair value of these investments.

As of September 30, 2013, our investments in money market funds and highly liquid debt instruments had a fair value of $2.1 billion and are reported as Short-term investments or Fiduciary assets in the Condensed Consolidated Statements of Financial Position depending on their nature and initial maturity.

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The following table summarizes our Fiduciary assets and non-fiduciary Cash and cash equivalents, and Short-term investments as of September 30, 2013 (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	$	369	$	—	$	2,594	$	2,963
Money market funds	—		357		1,716		2,073
Highly liquid debt instruments	—		—		25		25
Other investments due within one year	—		—		—		—
Cash and investments	369		357		4,335		5,061
Fiduciary receivables	—		—		7,363		7,363
Total	$	369	$	357	$	11,698	$	12,424

Share Repurchase Program

In April 2012, our Board of Directors authorized a share repurchase program under which up to $5 billion of Class A Ordinary Shares may be repurchased ("2012 Share Repurchase Program"). Under this program, 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.

In the third quarter of 2013, the Company repurchased 7.3 million shares at an average price per share of $68.33 for a total cost of $500 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2013, we repurchased 15.8 million shares at an average price per share of $64.79 for a total cost of $1.0 billion under the 2012 Share Repurchase Program. In the third quarter of 2012, the Company repurchased 5.4 million shares at an average price per share of $51.37 for a total cost of $275 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2012, the Company repurchased 12.7 million shares at an average price per share of $49.22 for a total cost of $625 million under the 2012 Share Repurchase Program and the previously completed 2010 Share Repurchase Program. Since the inception of the 2012 Share Repurchase Program, we repurchased a total of 35.3 million shares for an aggregate cost of $2.0 billion. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is approximately $3.0 billion.

For information regarding share repurchases made during the third quarter of 2013, see Part II, Item 2 — “Unregistered Sales of Equity Securities and Use of Proceeds” below.

Borrowings

Total debt at September 30, 2013 was $4.6 billion, which represents an increase of $393 million when compared to December 31, 2012. This increase is primarily due to an increase in commercial paper outstanding of $461 million when compared to December 31, 2012. Commercial paper activity during the quarter and nine months ended September 30, 2013 included total issuances of $1.3 billion and $3.7 billion, respectively, as compared to no issuances and $332 million for the quarter and nine months ended September 30, 2012. The proceeds of the commercial paper issuances were used primarily for short-term working capital needs and the repayment of the term credit loan facility due October 2013.

During the quarter ended September 30, 2013, the €500 million ($674 million) debt securities due July 2014 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statements of Financial Position as the date of maturity is less than one year.

On March 8, 2013, we issued $90 million in aggregate principal amount of 4.250% Notes Due 2042.

On May 21, 2013, we issued $250 million aggregate principal amount of 4.45% Notes Due 2043. The 4.45% Notes Due 2043 were issued by Aon plc and fully and unconditionally guaranteed by Aon Corporation. We used the proceeds of the issuance to repay commercial paper borrowings and for general corporate purposes.

Our total debt as a percentage of total capital attributable to Aon shareholders was 37.7% and 34.9% at September 30, 2013 and December 31, 2012, respectively.

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Credit Facilities

At September 30, 2013, we have a five-year $400 million unsecured revolving credit facility in the U.S. (“U.S. Facility”) that expires in 2017. The U.S. facility is for general corporate purposes, including commercial paper support.  Additionally, we have the five-year €650 million ($877 million at September 30, 2013 exchange rates) Euro Facility available, which expires in October 2015.  At September 30, 2013, we had no borrowings under either of these credit facilities.

On April 29, 2013, we amended our Euro Facility agreement to add Aon plc as an additional borrower.

For both our U.S. Facility and Euro Facility, the two most significant covenants require us to maintain a ratio of consolidated EBITDA (earnings before interest, taxes, depreciation and amortization), adjusted for Hewitt related transaction costs and up to $50 million in non-recurring cash charges (“Adjusted EBITDA”) to consolidated interest expense and a ratio of consolidated debt to Adjusted EBITDA. For both facilities, the ratio of Adjusted EBITDA to consolidated interest expense must be at least 4 to 1.  For the Euro Facility, the ratio of consolidated debt to Adjusted EBITDA must not exceed 3 to 1.  For the U.S. Facility, the ratio of consolidated debt to Adjusted EBITDA must not exceed the lower of (a) 3.25 to 1.00 or (b) the greater of (i) 3.00 to 1.00 or (ii) the lowest ratio of consolidated debt to Adjusted EBITDA then set forth in the Euro Facility or Aon’s $450,000,000 Term Loan Facility. We were in compliance with these and all other covenants during the three and nine months ended September 30, 2013. 

Shelf Registration Statement

On August 31, 2012, 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. The availability of any potential liquidity for these types of securities is dependent on investor demand, market conditions and other factors. Our May 2013 offering of $250 million of 4.45% Notes Due 2043 utilized this registration statement.

Rating Agency Ratings

The major rating agencies’ ratings of our debt at October 25, 2013 appear in the table below. 

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

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

Letters of Credit and Other Guarantees

We had total letters of credit ("LOCs") outstanding for approximately $71 million at September 30, 2013, as compared to $74 million at December 31, 2012. These letters of credit 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 issued 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.  Costs associated with these guarantees, to the extent estimable and probable, are provided in our allowance for doubtful accounts.  The maximum exposure with respect to such contractual contingent guarantees was approximately $81 million at September 30, 2013 as compared to $104 million at December 31, 2012.

We have provided commitments to fund certain limited partnerships in which we have an interest in the event that the general partners request funding.  Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $35 million and $51 million at September 30, 2013 and December 31, 2012, respectively.  During the three and nine months endedSeptember 30, 2013, we funded $7 million and $13 million, respectively, of these commitments.

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Adequacy of Liquidity Sources

We believe that cash flows from operations and available credit facilities will be sufficient to meet our liquidity needs, including principal and interest payments on debt obligations, capital expenditures, pension contributions, cash restructuring costs, and anticipated working capital requirements, for the foreseeable future. Our cash flows from operations, borrowing availability and overall liquidity are subject to risks and uncertainties. See “Information Concerning Forward-Looking Statements” below.

Financial Condition

At September 30, 2013, our net assets of $7.6 billion, representing total assets minus total liabilities, decreased from $7.8 billion at December 31, 2012. The decrease was due primarily to share repurchases of $1.0 billion, dividends of $159 million, and an increase in Accumulated other comprehensive loss of $26 million related primarily to foreign currency translation adjustment, partially offset by Net income of $788 million for the nine months ended September 30, 2013.  Working capital decreased by $649 million to $383 million from December 31, 2012.

Equity

Equity at September 30, 2013 was $7.6 billion, a decrease of $215 million from December 31, 2012.  The decrease resulted primarily from share repurchases of $1.0 billion, $159 million of dividends to shareholders, and an increase in Accumulated other comprehensive loss of $26 million, partially offset by Net income of $788 million.

The $26 millionincrease in Accumulated other comprehensive loss from December 31, 2012 primarily reflects the following:

• negative net foreign currency translation adjustments of $78 million, which are attributable to the strengthening of the U.S. dollar against certain foreign currencies,

• a decrease of $65 million in net post-retirement benefit obligations,

• net derivative losses of $12 million, and

• net investment losses of $1 million.

REVIEW BY SEGMENT

General

We serve clients through the following segments:

• Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through our global distribution network.

• HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Risk Solutions

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Revenue	$	1,821		$	1,778		$	5,736		$	5,582
Operating income	333			309			1,127			1,059
Operating margin	18.3		%	17.4		%	19.6		%	19.0		%

The demand for property and casualty insurance generally rises as the overall level of economic activity increases and generally falls as such activity decreases, affecting both the commissions and fees generated by our brokerage business. The economic activity that impacts property and casualty insurance is described as exposure units, and is most closely correlated with employment levels, corporate revenue and asset values.  During the first nine months of 2013, we began to see

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improvement in pricing on average globally; however, we would still consider this to be a “soft market”, which began in 2007.  In a soft market, premium rates flatten or decrease, along with commission revenues, due to increased competition for market share among insurance carriers or increased underwriting capacity.  Changes in premiums have a direct and potentially material impact on the insurance brokerage industry, as commission revenues are generally based on a percentage of the premiums paid by insureds. In the first nine months of 2013, pricing showed signs of stabilization and improvement in our retail brokerage product lines.

Additionally, beginning in late 2008 and continuing into third quarter 2013, we faced difficult conditions as a result of unprecedented disruptions in the global economy, the repricing of credit risk and the deterioration of the financial markets.  Weak global economic conditions have reduced our customers’ demand for our retail brokerage and reinsurance brokerage products, which have had a negative impact on our operational results.

Risk Solutions generated approximately 65% and 67% of our consolidated total revenues in the third quarter and first nine months of 2013, respectively.  Revenues are generated primarily through fees paid by clients, commissions and fees paid by insurance and reinsurance companies, and investment income on funds held on behalf of clients.  Our revenues vary from quarter to quarter throughout the year as a result of the timing of our clients’ policy renewals, the net effect of new and lost business, the timing of services provided to our clients, and the income we earn on investments, which is heavily influenced by short-term interest rates.

We operate in a highly competitive industry and compete with many retail insurance brokerage and agency firms, as well as with individual brokers, agents, and direct writers of insurance coverage.  Specifically, we address the highly specialized product development and risk management needs of commercial enterprises, professional groups, insurance companies, governments, health care providers, and non-profit groups, among others; provide affinity products for professional liability, life, disability income, and personal lines for individuals, associations, and businesses; provide products and services via GRIP Solutions; provide reinsurance services to insurance and reinsurance companies and other risk assumption entities by acting as brokers or intermediaries on all classes of reinsurance; provide capital management transaction and advisory products and services, including mergers and acquisitions and other financial advisory services, capital raising, contingent capital financing, insurance-linked securitizations and derivative applications; provide managing underwriting to independent agents and brokers as well as corporate clients; provide risk consulting, actuarial, loss prevention, and administrative services to businesses and consumers; and manage captive insurance companies.

Revenue

Commissions, fees and other revenue for Risk Solutions were as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Retail brokerage:
Americas	$	774	$	743	$	2,286	$	2,188
International (1)	650		647		2,262		2,207
Total retail brokerage	1,424		1,390		4,548		4,395
Reinsurance brokerage	389		377		1,167		1,156
Total	$	1,813	$	1,767	$	5,715	$	5,551

  ______________________________________________

(1) Includes the U.K., Europe, Middle East, Africa and Asia Pacific.

During the third quarter 2013, commissions, fees and other revenue increased$46 million, or 3%, as compared to the third quarter 2012, due to 4% organic revenue growth, partially offset by 1% unfavorable impact from foreign exchange rates and a decline in investment income. During the first nine months of 2013, Commissions, fees and other revenue increased$164 million, or 3%, as compared to the first nine months of 2012 due to 4% organic revenue growth, partially offset by 1% unfavorable impact from foreign exchange rates and a decline in investment income.

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Reconciliation of organic revenue growth to reported commissions, fees and other revenue growth for 2013 versus 2012 is as follows:

Three months ended September 30, 2013	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Retail brokerage:
Americas	4	%	(2	)%	1	%	5	%
International (1)	—		(1	)	(1	)	2
Total retail brokerage	2		(1	)	(1	)	4
Reinsurance brokerage	3		(1	)	(1	)	5
Total	3	%	(1	)%	—	%	4	%

Nine months ended September 30, 2013	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Retail brokerage:
Americas	4	%	(1	)%	—	%	5	%
International (1)	2		—		(1	)	3
Total retail brokerage	3		(1	)	—		4
Reinsurance brokerage	1		(1	)	—		2
Total	3	%	(1	)%	—	%	4	%

  ______________________________________________

(1) Includes the U.K., Europe, Middle East, Africa and Asia Pacific.

Retail brokerage Commissions, fees and other revenue increased 2% in the third quarter driven by 5% and 2% organic revenue growth in the Americas and International operations, respectively, partially offset by a decline in investment income, a 1% decrease related to acquisitions, net of dispositions, and 1% unfavorable impact from foreign exchange rates. During the first nine months of 2013, revenue growth was 3%, driven by 5% and 3% organic revenue growth in the Americas and International operations, respectively, partially offset by a decline in investment income, a 1% decrease related to acquisitions, net of dispositions in the Americas operations, and a 1% unfavorable impact from foreign exchange rates.

Americas Commissions, fees and other revenue increased 4% in the third quarter reflecting 5% growth in organic revenue due to growth across all regions driven by strong management of the renewal book portfolio, a modestly positive market impact, and a 1% increase related to acquisitions, net of dispositions, partially offset by a 2% unfavorable impact from foreign currency. During the first nine months of 2013, revenue increased 4% as a result of 5% growth in organic revenue, partially offset by a 1% unfavorable impact from foreign exchange rates.

International Commissions, fees and other revenue was flat in the third quarter driven by a 2% increase in organic revenue growth offset by unfavorable 1% impact from acquisitions, net of divestitures and a 1% unfavorable impact from foreign exchange rates. Organic growth of 2% was driven by strong growth across emerging markets, New Zealand and Asia, partially offset by a modest decline in Australia and Spain. During the first nine months of 2013, International revenue increased 2%, due to 3% organic revenue growth, partially offset by a 1% decrease related to acquisitions, net of dispositions.

Reinsurance brokerage Commissions, fees and other revenue increased 3% in the third quarter driven by a 5% increase in organic revenue growth, partially offset by a 1% unfavorable impact from foreign exchange rates and a 1% decrease related to acquisitions, net of dispositions. The increase in organic revenue growth is due primarily to growth in treaty and facultative placements, a modest favorable market impact and timing benefit in the quarter. During the first nine months of 2013, revenue increased 1%, driven by a 2% increase in organic revenue growth partially offset by an unfavorable impact of 1% from foreign exchange rates.

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Operating Income

Operating income for the third quarter 2013increased$24 million, or 8%, from 2012 to $333 million in 2013, and operating income margins increased to 18.3% from 17.4% in 2012.  For the first nine months of 2013, Operating income increased$68 million, or 6%, from 2012 to $1.1 billion in 2013, and operating income margins increased to 19.6% from 19.0% in 2012. Operating margin improvement was driven by revenue growth and savings related to the restructuring programs, which was partially offset by unfavorable impact from foreign currency translation and a decline in fiduciary investment income.

HR Solutions

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Revenue	$	981		$	971		$	2,891		$	2,847
Operating income	75			80			162			211
Operating margin	7.6		%	8.2		%	5.6		%	7.4		%

Our HR Solutions segment generated approximately 35% and 33% of our consolidated total revenues the third quarter and first nine months of 2013, respectively, and provides a broad range of human capital services, as follows:

· Retirement specializes in global actuarial services, defined contribution consulting, tax and ERISA consulting, and pension administration.

· Compensation focuses on compensatory advisory/counsel including: compensation planning design, executive reward strategies, salary survey and benchmarking, market share studies and sales force effectiveness, with special expertise in the financial services and technology industries.

· Strategic Human Capital delivers advice to complex global organizations on talent, change and organizational effectiveness issues, including talent strategy and acquisition, executive on-boarding, performance management, leadership assessment and development, communication strategy, workforce training and change management.

· Investment consulting advises public and private companies, other institutions and trustees on developing and maintaining investment programs across a broad range of plan types, including defined benefit plans, defined contribution plans, endowments and foundations.

· Benefits Administration applies our HR expertise primarily through defined benefit (pension), defined contribution (401(k)), and health and welfare administrative services. Our model replaces the resource-intensive processes once required to administer benefit plans with more efficient, effective, and less costly solutions.

· Exchanges is building and operating healthcare exchanges that provide employers with a cost effective alternative to traditional employee and retiree healthcare, while helping individuals select the insurance that best meets their needs.

· Human Resource Business Processing Outsourcing (“HR BPO”) provides market-leading solutions to manage employee data; administer benefits, payroll and other human resources processes; and record and manage talent, workforce and other core HR process transactions as well as other complementary services such as flexible spending, dependent audit and participant advocacy.

Beginning in late 2008, the disruption in the global credit markets and the deterioration of the financial markets created significant uncertainty in the marketplace.  Weak economic conditions globally continued into the third quarter of 2013.  The prolonged economic downturn is adversely impacting our clients’ financial condition and therefore the levels of business activities in the industries and geographies where we operate.  While we believe that the majority of our practices are well positioned to manage through this time, these challenges are reducing demand for some of our services and putting continued pressure on the pricing of those services, which is having an adverse effect on our new business and results of operations.

Revenue

Commissions, fees and other revenue for HR Solutions increased$10 million, or 1%, in the third quarter 2013 as compared to the third quarter 2012. The increase in revenue was driven by 1% organic growth in commissions and fees for the first nine months of 2013, respectively.

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Commissions, fees and other revenue were as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Consulting services	$	406		$	394		$	1,176		$	1,140
Outsourcing	587			585			1,746			1,723
Intrasegment	(12		)	(8		)	(31		)	(16		)
Total	$	981		$	971		$	2,891		$	2,847

Organic revenue growth for the third quarter 2013 is detailed in the following reconciliation:

Three months ended September 30, 2013	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Consulting services	3	%	(1	)%	1	%	3	%
Outsourcing	—		—		1		(1	)
Intrasegment	N/A		N/A		N/A		N/A
Total	1	%	(1	)%	2	%	—	%

Nine months ended September 30, 2013	Percent Change		Less: Currency Impact		Less: Acquisitions, Divestitures & Other		Organic Revenue
Consulting services	3	%	(1	)%	1	%	3	%
Outsourcing	1		—		1		—
Intrasegment	N/A		N/A		N/A		N/A
Total	2	%	—	%	1	%	1	%

Consulting services revenue increased$12 million, or 3%, for the third quarter due primarily to 3% organic revenue growth driven by growth in investment, compensation, and communications consulting. For the first nine months of 2013, revenue increased$36 million, or 3%, as a result of 3% organic revenue growth.

Outsourcing revenue increased$2 million, or essentially flat, for the third quarter due to 1% impact from acquisitions, net of divestitures, offset by unfavorable organic revenue of 1%. Organic revenue was flat compared to the prior year quarter due primarily to an anticipated decline in benefits administration, partially offset by demand for discretionary services. For the first nine months of 2013, revenue increased$23 million, or 1%, as a result of 1% impact from acquisitions, net of divestitures.

Operating Income

Operating income was $75 million, a decrease of $5 million, or 6%, from third quarter 2012. For the first nine months, operating income was $162 million, a decrease of $49 million, or 23%, from the prior year. The year-to-date decrease was primarily due to an unfavorable impact from expenses related to legacy litigation and timing of certain expenses, as well as an unfavorable revenue mix shift, and investments in long-term growth opportunities that more than offset organic revenue growth and the savings related to the Aon Hewitt restructuring program. Operating margin for this segment was 7.6% in the third quarter, which is a decrease from 8.2% in 2012. For the first nine months of 2013, the operating margin was 5.6%, a decrease from 7.4% in 2012.  

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Unallocated Income and Expense

A reconciliation of our operating income to income before income taxes is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Operating income (loss):
Risk Solutions	$	333		$	309		$	1,127		$	1,059
HR Solutions	75			80			162			211
Unallocated	(44		)	(50		)	(133		)	(135		)
Operating income	364			339			1,156			1,135
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other (expense) income	39			(9		)	54			3
Income before income taxes	$	353		$	274		$	1,063		$	971

Unallocated operating expense

Unallocated operating expense includes corporate governance costs not allocated to the operating segments.  Net unallocated expenses decreased$6 million to $44 million in the third quarter 2013 and decreased$2 million to $133 million for the first nine months of 2013. The decrease in unallocated expenses during the three and nine months ended September 30, 2013 is due primarily to decrease in expenses related to the Company's redomicile to the U.K.

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 2013, Interest income increased$2 million to $3 million in the third quarter 2013 as compared to the third quarter 2012. During the first nine months of 2013, Interest income remained flat as compared to the same period in 2012. The increase during the third quarter is due to a higher average level of cash balances. The third quarter impact was offset in the year to date period by lower average interest rates globally.

Interest expense

Interest expense, which represents the cost of our worldwide debt obligations, decreased$4 million and $20 million as compared to the third quarter and first nine months of 2012, respectively. The decrease in interest expense reflects a decline in the average interest rate on total debt outstanding.

Other income (expense)

Other income (expense) was $39 million income and $54 million income for the third quarter and first nine months of 2013, respectively, as compared to $9 million expense and $3 million income for the third quarter and the first nine months of 2012, respectively.  The third quarter 2013 includes a $37 million gain on sale of investments and equity earnings of $6 million, partially offset by a $4 million loss on foreign currency remeasurement. The first nine months of 2013 include a $36 million gain on investments, a $15 million gain on foreign currency remeasurement and equity earnings of $12 million, partially offset by an $8 million loss from derivatives. The third quarter 2012 includes a $24 million loss on foreign currency remeasurement, partially offset by an $8 million hedging gain and a $9 million gain on investments. The first nine months of 2012 include an $11 million gain on investments, equity earnings of $8 million, and an $8 million hedging gain, partially offset by a $24 million loss on foreign currency remeasurement.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

There have been no changes in our critical accounting policies, which include revenue recognition, restructuring, pensions, goodwill and other intangible assets, contingencies, share-based payments, and income taxes, as discussed in our 2012 Annual Report on Form 10-K.

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NEW ACCOUNTING PRONOUNCEMENTS

Note 2 “Accounting Principles and Practices” of the Notes to the Condensed Consolidated Financial Statements contains a discussion of recently issued accounting pronouncements and their impact or future potential impact on our financial results, if determinable.

INFORMATION CONCERNING FORWARD-LOOKING STATEMENTS

This report 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 relate to expectations or forecasts of future events.  They use words such as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “project,” “intend,” “plan,” “potential,” 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 that could impact results include:

· general economic conditions in different countries in which Aon does business around the world, including conditions in the European Union relating to sovereign debt and the continued viability of the Euro;

· changes in the competitive environment;

· changes in global equity and fixed income markets that could influence 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;

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

· fluctuations in exchange and interest rates that could impact revenue and expense;

· the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions and ERISA class actions;

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

· the cost of resolution of other contingent liabilities and loss contingencies, including potential liabilities arising from errors and omission claims against us;

· failure to retain and attract qualified personnel;

· 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 business and the possibility of conflicting regulatory requirements across jurisdictions in which we do business;

· the effect of the Redomestication on our operations and financial results, including the reaction of our clients, employees and other constituents, the effect of compliance with applicable U.K. regulatory regimes or differences in some or all of the anticipated benefits;

· the extent to which we retain existing clients and attract new businesses and our ability to incentivize and retain key employees;

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

· the possibility that the expected efficiencies and cost savings from the acquisition of Hewitt will not be realized, or will not be realized within the expected time period;

· the risk that the Hewitt businesses will not be integrated successfully;

· our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, and the ability to achieve those cost savings;

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

· 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; and

· our ability to grow and develop companies that we acquire or new lines of business.

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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 the “Risk Factors” sections in each of Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2012 and Part II Item 1A of this report below.

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 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.

We are subject to foreign exchange rate risk. Our primary exposures include exchange rates between the U.S. Dollar and the British pound, the Euro, the Canadian dollar, the Australian dollar, and the Indian rupee.  We use over-the-counter (“OTC”) options and forward contracts to reduce the impact of foreign currency risk.

Additionally, some of our foreign brokerage subsidiaries receive revenues in currencies that differ from their functional currencies.  Our U.K. subsidiary earns a portion of its revenue in U.S. dollars and Euros, but the majority of its expenses are incurred in Pounds Sterling.  Our policy is to convert into Pounds Sterling sufficient U.S. dollar and Euro revenue to fund the subsidiary’s Pound Sterling expenses using OTC options and forward exchange contracts. At September 30, 2013, we have hedged approximately 81% of our U.K. subsidiaries’ expected U.S. dollar and Euro transaction exposures for the next twelve months, respectively.  We do not generally hedge these exposures beyond three years.

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

The translated value of revenue and expense from our international brokerage operations are subject to fluctuations in foreign exchange rates. If the Company were to translate prior year results at current quarter exchange rates, diluted earnings per share would be unfavorably impacted by approximately $0.01 during both the three and nine months endedSeptember 30, 2013, respectively.  Further, adjusted diluted earnings per share, a non-GAAP measure as defined under the caption “Review of Consolidated Results’, would be unfavorably impacted by approximately $0.02 and $0.01 during the three and nine months endedSeptember 30, 2013, respectively, if the Company were to translate prior year results at current quarter exchange rates.

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 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, 2013.  Based on this evaluation, our chief executive officer and chief financial officer concluded as of September 30, 2013 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 Securities and Exchange Commission (“SEC”) reports is recorded, processed, summarized and reported within the time periods specified in 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.  During 2011, the Company upgraded its financial systems relating to the Order-To-Cash PeopleSoft platform used by the HR Solutions North America operations. In connection with this upgrade, the Company has implemented additional compensating controls to mitigate internal control risks and performed testing to ensure data integrity. Other than this change, no changes in Aon's internal control over financial reporting (as defined in Rule

55

13a - 15(f) of the Exchange Act) occurred during the quarter ended September 30, 2013 that have materially affected, or are reasonably likely to materially affect, Aon's internal control over financial reporting.

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PART II

OTHER INFORMATION

ITEM 1.LEGAL PROCEEDINGS

See Note 15 "Commitments and Contingencies" to the Condensed Consolidated Financial Statements contained in Part I, Item 1, which is incorporated by reference herein.

ITEM 1A.RISK FACTORS.

The risk factors set forth in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012 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

(a)  None.

(b)  None.

(c)  Issuer Purchases of Equity Securities.

The following information relates to the repurchase of equity securities by Aon or any affiliated purchaser during each month within the third quarter of 2013:

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	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (1)  (2)
7/1/13 — 7/31/13	500,000	$	67.70	500,000	$	3,416,500,957
8/1/13 — 8/31/13	6,815,655	68.37		6,815,655	2,950,496,281
9/1/13 — 9/30/13	—	—		—	2,950,496,281
Total	7,315,655	$	68.33	7,315,655	2,950,496,281

  ______________________________________________

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

(2)   In April 2012, our Board of Directors authorized a share repurchase program under which up to $5 billion of Class A Ordinary Shares were authorized to be repurchased from time to time depending on market conditions or other factors through open market or privately negotiated transactions, and will be funded from available capital. During the third quarter of 2013, we repurchased 7.3 million shares at an average price per share of $68.33 for a total cost of $500 million. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $3.0 billion.

ITEM 5. OTHER INFORMATION

On September 20, 2013, our Board of Directors approved June 24, 2014 as the date of the 2014 Annual General Meeting of Shareholders. Shareholders who wish to present proposals for inclusion in the proxy materials to be distributed by us in connection with our 2014 Annual General Meeting must submit their proposals to the Office of the Company Secretary of Aon at 8 Devonshire Square, London EC2M 4PL.

In accordance with applicable SEC rules, we have set the deadline for submission of proposals to be included in our proxy materials to be distributed by us in connection with our 2014 Annual General Meeting as January 9, 2014. Additional information regarding procedures, timing and other requirements related to shareholder proposals or nominations outside of Rule 14a−8 may be found in our articles of association and the proxy materials for our 2013 Annual General Meeting of Shareholders as filed with the SEC on Schedule 14A on April 1, 2013.

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ITEM 6.EXHIBITS

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

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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, 2013	By:	/s/ Laurel Meissner
	LAUREL MEISSNER
	SENIOR VICE PRESIDENT AND
	GLOBAL CONTROLLER
	(Principal Accounting Officer and duly authorized officer of Registrant)

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Exhibit Index

Exhibit Number	Description of Exhibit
10.1	Aon Deferred Compensation Plan (as amended and restated effective as of September 20, 2013)
12.1	Statement regarding Computation of Ratio of Earnings to Fixed Charges.
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.INS XBRL Report Instance Document
	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

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EX-10.1

Exhibit 10.1

AON DEFERRED COMPENSATION PLAN

(As Amended and Restated Effective as of September 20, 2013)

TABLE OF CONTENTS

	Page
SECTION 1 Definitions	1
SECTION 2 Eligibility	3
2.01 Eligibility	3
SECTION 3 Election To Defer	4
3.01 Irrevocable Election	4
3.02 First Calendar Year Election	4
SECTION 4 Deferred Compensation Amounts and Investment Elections	5
4.01 Deferral Period Accounts	5
4.02 Investment Elections	5
4.03 Amounts Credited to the Aon Common Stock Account	5
4.04 Earnings Credited to the Aon General Account	5
4.05 Amounts Credited to Other Investment Accounts	6
SECTION 5 Method of Distribution	7
5.01 Method of Distribution	7
5.02 Installment Payments	8
5.03 Withdrawals for Immediate Financial Need	8
5.04 Withdrawals with Significant Penalty	9
5.05 Distribution Upon Death	9
5.06 Form of Distribution	9
SECTION 6 Miscellaneous	10
6.01 Participant's Rights and Interest in the Accounts	10
6.02 Nonalienability and Nontransferability	10
6.03 Plan administrator	10
6.04 Amendment and Termination	10
SECTION 7 General Provisions	11
7.01 Controlling Law	11
7.02 Facility of Payment	11
7.03 Withholding of Payroll Taxes	11
7.04 Liability	11
7.05 Successors	11

AON DEFERRED COMPENSATION PLAN

(As Amended and Restated Effective as of September 20, 2013)

PREAMBLE

The purpose of this plan is to provide certain select management or highly compensated employees of Aon Corporation ("Aon" or the "Company") and its subsidiaries with the opportunity to defer amounts earned as an employee. The Plan will be known as the Aon Deferred Compensation Plan (As Amended and Restated as of September 20, 2013) (the "Plan"). The Plan, as amended and restated and as set forth herein, shall be effective as of September 20, 2013 for the purpose of permitting deferrals of compensation earned and vested after December 31, 2004 and any amounts credited thereon, including pursuant to Section 4.03. All amounts deferred under the Plan prior to January 1, 2005, that were earned and vested prior to January 1, 2005, and any amounts credited thereon (including pursuant to Section 4.03), shall be governed by the terms of the Plan as in effect on October 3, 2004 and nothing in this amended and restated Plan document shall affect deferred amounts under the Plan that were earned and vested prior to January 1, 2005 and any amounts credited thereon. It is intended that all amounts deferred under the Plan that were earned and vested prior to January 1, 2005, and any amounts credited thereon, shall be grandfathered from the application of Section 409A of the Internal Revenue Code of 1986, as amended (the "Code"). The determination of whether amounts deferred under the Plan, or any amounts credited thereon, were earned and vested prior to January 1, 2005 shall be made in accordance with Code Section 409A and the guidance and Treasury regulations issued thereunder.

SECTION 1

Definitions

1.01 "Accounts" shall mean the Distribution Accounts and Investment Accounts.

1.02 "Administrative Committee" shall mean the Administrative Committee under the Aon Savings Plan.

1.03 "Aon Stock Account" shall mean the account established on the books of the Company or a Subsidiary for a Participant who has elected to allocate any deferral into Class A Ordinary Shares of Aon plc. The Aon Stock Account shall be considered an Investment Account hereunder and may be available for deferrals in the discretion of the Company. Notwithstanding the foregoing, as described in Section 4.03 herein the Aon Stock Account will cease to be available under the Plan, both for future allocations of deferrals and to hold existing balances of prior deferrals, effective November 22, 2013.

1.04 "Aon General Account" shall mean the account established on the books of the Company or a Subsidiary for a Participant who has elected to allocate any deferral into the Aon General Account. The Aon General Account shall be considered an Investment Account hereunder and may be available for deferrals in the discretion of the Company.

1.05 "Beneficiary" shall mean the beneficiary or beneficiaries designated by the Participant to receive the amount, if any, payable under the Plan upon the death of the Participant.

1.06 "Board" shall mean the board of directors of Aon plc, a public limited company incorporated under English law.

1.07 "Company" shall mean Aon Corporation.

1.08 "Compensation" shall mean the following types of earnings paid to an Employee for his service on behalf of the Company or the Subsidiaries: (i) salary and fixed base compensation including

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compensation for overtime, and net commission, renewal and override compensation; (ii) amounts paid by the Company pursuant to but not limited to a periodic individual performance appraisal or contractual agreement ("Bonus"); and (iii) other bonus, personal lines commissions, sign on bonus and stay bonus ("Other Earnings"). The following shall not be included in Compensation: (i) deferred compensation payments; (ii) vested or unvested stock awards; (iii) income from the exercise of stock options; (iv) expense reimbursements; (v) distributions from, and Company or Subsidiary contributions to, the Aon Savings Plan, the Aon Employee Stock Ownership Plan, the Aon Pension Plan or any other Company or Subsidiary fund or plan providing retirement, health, welfare, death, insurance or similar benefits; (vi) amounts paid to an Employee in respect to employment during which he is not permanently employed within the United States or its possessions; and (vii) amounts paid to an Employee while on a short or long term assignment outside of the U.S. regardless of whether the Employee remains on the U.S. payroll; and (viii) amounts previously deferred under the terms of the Plan.

1.09 "Distribution Accounts" shall mean the Accounts established by the Administrative Committee to reflect the distribution method selected by a Participant. If the Employee elects to begin distributions before termination of employment for any reason, the Distribution Account shall be known as an "In-Service Account." If a Participant elects to begin distributions in the year following termination of employment for any reason, the Distribution Account shall be known as a "Retirement Account." A Participant may select one or two distribution methods to begin before termination of employment, and therefore the Administrative Committee may establish one or two "In-Service Accounts" for a Participant. The Participant may select only one distribution method to begin after termination of employment, and therefore the Administrative Committee may establish only one Retirement Account for a Participant. If a Participant does not make an affirmative election, the Distribution Account shall be a Retirement Account.

1.10 "Employee" shall mean any United States staff employee of the Company or any Subsidiary who is residing and working in the United States at the time of the deferral.

1.11 "Investment Accounts" shall mean the Accounts established by the RPGIC to reflect the investment alternatives selected by the Participant from among the investment alternatives made available by the Company under Section 4.02 of the Plan. These Investment Accounts will be established under each Distribution Account to reflect the investment alternative(s) elected by the Participant for that Distribution Account.

1.12 "Participant" shall mean any eligible Employee who elects to participate in the Plan pursuant to Section 2.

1.13 "Plan" shall mean the Aon Deferred Compensation Plan (As Amended and Restated Effective as of September 20, 2013).

1.14 “RPGIC” means the Retirement Plan Governance and Investment Committee of Aon Corporation, comprised of management employees.

1.15 "Subsidiary" shall mean any corporation of which 50% or more of the voting stock is owned or controlled, directly or indirectly, by the Company or by one or more of such corporations.

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SECTION 2

Eligibility

2.01 Eligibility

Any Employee of the Company or a Subsidiary who received wages or compensation as reported on Box 5 of IRS Form W-2 of $150,000 or more in the prior calendar year or whose rate of annual base pay in the current calendar year is $150,000 or more shall be eligible to participate in the Plan, unless otherwise decided by the Board or the administrative Committee. In addition, other select management or highly compensated Employees may be eligible to participate at the option of the Administrative Committee. Every eligible Employee shall become a Participant after making an irrevocable election to participate as described in Sections 3.01 or 3.02.

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SECTION 3

Election To Defer

3.01 Irrevocable Election

On or before December 31 of any year, each Employee eligible to participate in the Plan shall be entitled to make an irrevocable election to defer receipt of any whole percentage (up to 75%) of bi-weekly Compensation paid to the Employee for his services as an employee from the Company or a Subsidiary for the following calendar year. An election to defer receipt of any net commission that qualifies as a sales commission, as defined in Treasury regulation Section 1.409A-2(a)(12)(i), shall be effective for any net commissions earned by an Employee during the following calendar year based on sales that occur during such calendar year. On or before December 31 of any year prior to the year in which the performance period for any Bonus commences, each Employee eligible to participate in the Plan shall also be entitled to make an irrevocable election to defer receipt of such Bonus in any whole percentage (up to 100%). In addition, on or before December 31 of any year, each Employee eligible to participate in the Plan shall be entitled to make an irrevocable election to defer receipt of any whole percentage (up to 100%) of Other Earnings paid to the Employee for his services as an Employee from the Company or a Subsidiary for the following calendar year.

Each Participant will need to make an affirmative election to make deferrals hereunder for each calendar year, in accordance with rules established by the Administrative Committee.

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SECTION 4

Deferred Compensation Amounts and Investment Elections

4.01 Deferral Period Accounts

The Administrative Committee shall establish Distribution Accounts and Investment Accounts for any Employee who makes a deferral. The Administrative Committee shall establish such other subaccounts as are necessary for proper administration under the Plan.

4.02 Investment Elections

Through the RPGIC, the Company will select the investment alternatives available to the Participants, and the Company shall establish an Investment Account for each available investment alternative. The Participant may make a separate investment election for each distribution

Account created under Section 5.01.

Each Participant making an election to defer amounts shall also elect how the deferred amount will be allocated to the Investment Accounts. If a Participant fails to make an investment allocation, any deferral shall be allocated to the Investment Account representing a money market fund. Participants may make reallocations of such amounts among the existing investment alternatives on any business day; except (i) changes may not be made more than once a day and (ii) the Administrative Committee may impose whatever other restrictions it deems advisable, including restrictions which may apply only to certain Participants in the Plan, restrictions which may apply only to deferrals made under prior plans, and restrictions designed to prevent violation of the federal securities laws.

4.03 Amounts Credited to the Aon Stock Account

For any deferral allocated to the Aon Stock Account, the amount of shares so credited will be determined by dividing the deferred amount by the Fair Market Value of Aon plc Class A Ordinary Shares on the New York Stock Exchange. Deferrals will be credited to the Employee's account as soon as administratively possible after the day such deferral would have been payable to the Participant had it not been deferred. The "Fair Market Value" of Aon plc Class A Ordinary Shares on any day is the closing price, regular way, as reported by an independent pricing service selected by the RPGIC.

As of the date any cash dividends are paid on Aon plc Class A Ordinary Shares, each Participant's Aon Stock Account shall be credited with the dividend equivalents that would be paid with respect to Aon plc Ordinary Shares on that date as if the Participant owned the stock credited under the Aon Stock Account. Dividend equivalents will be treated as if they are reinvested in whole or fractional shares of Aon plc Class A Ordinary Shares on the dividend date, based on the Fair Market Value on that date.

Notwithstanding the foregoing, effective November 22, 2013 the Aon Stock Account will cease to be available under the Plan. No allocations of deferrals to the Aon Stock Account will be allowed as of November 21, 2013. In addition, any allocations previously made to the Aon Stock Account must be re-allocated by Participants to one or more available Investment Accounts or the Aon General Account no later than November 21, 2013. Any balance in the Aon Stock Account as of November 22, 2013 for which a re-allocation election has not been submitted will be automatically transferred to the Investment Account known as the “Vanguard VIF Money Market account” as of such date. Thereafter, Participants will be eligible to re-allocate such amounts to other Investment Accounts pursuant to the terms of this Plan.

4.04 Earnings Credited to the Aon General Account

Earnings credited to the Aon General Account shall be determined as follows: the credited rate will be the six-month Treasury bill yield rate, determined as of each January 1 and July 1 by averaging this

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yield as published monthly by the Federal Reserve Bank of St. Louis on a bank discount basis through the secondary market for the last six months immediately prior to the applicable January 1 or July 1. After this yield is determined as of each January 1 and July 1, the yield will remain effective for the entire 6-month period. The rate of interest may be modified prospectively (applying to all deferrals) by the Board at any time in its exclusive discretion.

4.05 Amounts Credited to Other Investment Accounts

If any deferral is allocated to an Investment Account other than the Aon Stock Account (prior to November 21, 2013) or the Aon General Account, such deferral shall be credited as soon as administratively feasible after the day such amount would have been payable to the Participant had it not been deferred. The amount of shares so credited to the Account will be determined by dividing the deferred amount by the Fair Market Value of the investment alternative. The "Fair Market Value" of that alternative is the last sales/purchase price of that alternative on that day. If dividends are paid on the Investment Account, the dividends will be treated as reinvested in that investment alternative, based on its Fair Market Value on that date. If a Participant changes his or her investment alternative, any amount invested or disinvested in any alternative investment will be done as soon as administratively feasible at the Fair Market Value of that alternative investment on that day; provided, however, a Participant may not change his or her investment alternative election more than once a day.

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SECTION 5

Method of Distribution

5.01 Method of Distribution

A Participant may elect up to three different distribution forms of payments and these forms may differ as to the timing of commencement of payments or distribution period, or both. A Participant may elect up to two different forms of payment which will apply to payments before termination of employment (the "In-Service Accounts") and one form of payment which will apply to payment after termination of employment (the "Retirement Account").

When the Participant elects to defer any Compensation, any Bonus and/or any Other Earnings pursuant to Section 3, the Participant shall also make an irrevocable election as to the beginning year of distribution with respect to amounts so credited to the Distribution Accounts of the Participant and as to the form of payment. Pursuant to rules established by the Administrative Committee, such elections may provide for distributions to commence on a date or pursuant to a fixed schedule before a Participant's termination of employment (the "In-Service Accounts") or within the first 2 1/2months of the year after the Participant's termination of employment with Aon and its Subsidiaries (the "Retirement Account"). For purposes of the Plan, a Participant shall be considered to have a termination of employment with the Company and its Subsidiaries on the date such Participant has a "separation from service" as described under Code Section 409A and the guidance and Treasury regulations issued thereunder with the Company and all of its Subsidiaries. The closing of the sale of Combined Insurance Company of America, Inc. and of Sterling Life Insurance Company by the Company to an unrelated purchaser shall be treated as a "separation from service" for purposes of Code Section 409A in accordance with Treasury regulations thereunder for those Participants who provide services to the Company and its Subsidiaries immediately prior to the closing and provide services to the unrelated purchaser and its subsidiaries immediately after and in connection with the closing. If a Participant elects to commence distributions on a date or pursuant to a fixed schedule before termination of employment with Aon and its Subsidiaries, an In-Service Account will be established and the Participant may elect payment in annual installments not in excess of five or in a lump sum, but the commencement date must be later than 3 years after the Participant's first deferral.

If a Participant elects to commence distributions after termination of employment with Aon and its Subsidiaries, or if a Participant fails to make any election, a Retirement Account will be established, and the Participant may elect payment in annual installments not in excess of ten or in a lump sum. If a Participant has elected to commence distributions in a particular year before termination of employment, but he or she terminates employment with Aon and its Subsidiaries before such date, distributions to the Participant will be made pursuant to the election that the Participant made for amounts distributed from the Retirement Account. If a Participant fails to make an election for amounts to be distributed from the Retirement Account, then distributions from the In-Service Accounts and from the Retirement Account will be paid in three annual installments, beginning on February 28 of the year following termination of employment, based on the balance as of that February 28. Notwithstanding the foregoing, only one time and form of payment shall be permitted following a termination of employment unless termination of employment occurs before or after a specified date or a specified age in accordance with Code Section 409A.

Payments due before termination of employment for any calendar year will be made during the first 2 ½ months of such year based on the balance as of the February 14 that falls within such 2 ½ month period. Payments due on account of termination of employment will be made during the first 2 ½ months of the year following termination of employment based on the balance as of the February 14 that falls within such 2 ½ month period. Notwithstanding the foregoing, if a Participant is a "specified employee" for purposes of Code Section 409A, distribution on account of termination of employment (whether from the Retirement Account or the In-Service Accounts) shall be delayed until the earlier to occur of the Participant's death or the date that is six months and one day following the Participant's termination of

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employment with Aon and its Subsidiaries (the "Delay Period"), provided that such date is later than the date such payment would otherwise have been made pursuant to the preceding sentence. Upon the expiration of the Delay Period, the payment delayed pursuant to this Section 5.01 shall be paid to the Participant, and any remaining installment payments due under this Section 5.01 shall be payable in accordance with their original payment schedule.

A Participant may elect to change the form of distribution and/or the timing of commencement of payment of his Distribution Accounts provided such election (i) is made at least 12 months before the date the lump sum payment or the first installment payment is otherwise scheduled to be paid, (ii) shall not take effect until at least 12 months after the date on which such election is made, and (iii) except in the case of a payment upon the death or Unforeseeable Emergency (as described below in Section 5.03) of the Participant, shall defer payment of the Participant's Distribution Accounts for at least five years from the date the lump sum payment or the first installment amount would otherwise have been paid. A Participant shall not be permitted to elect to change the form of distribution and/or the timing of commencement of payments for his Accounts more than once.

5.02 Installment Payments

If the Participant has elected installment payments, the amount of the first payment shall be a fraction of the total balances of the Participant's Distribution Accounts as of the applicable February 14, the numerator of which is one and the denominator of which is the total number of installments elected. The amount of each subsequent payment shall be a fraction of the total balances, including any dividend equivalents, of the Participant's Distribution Accounts similarly computed for each subsequent payment, the numerator of which is one and the denominator of which is the total number of installments remaining. Each installment shall be withdrawn proportionately from the Aon Stock Account (prior to November 22, 2013) and Aon General Account and whatever other Investment Accounts of the Participants exist.

5.03 Withdrawals for Unforeseeable Emergency

Amounts deferred under the Plan may be distributed to a Participant, upon the written request of the Participant and at the discretion of the Administrative Committee, based on an Unforeseeable Emergency. An "Unforeseeable Emergency" shall mean a severe financial hardship resulting from (i) an illness or accident of the Participant, the participant's spouse or Beneficiary, or the Participant's dependent (as defined in Code Section 152, without regard to Code Section 152(b)(l), (b)(2), and (d)(l)(B)); (ii) the loss of the Participant's property due to casualty (including the need to rebuild a home following damage to a home not otherwise covered by insurance, for example, not as a result of a natural disaster); or (iii) other similar extraordinary and unforeseeable circumstances arising as a result of events beyond the control of the Participant. In addition, the need to pay for medical expenses, including non-refundable deductibles, as well as for the costs of prescription drug medication, may constitute an Unforeseeable Emergency. Finally, the need to pay for the funeral expenses of the Participant's spouse or Beneficiary, or the Participant's dependent (as defined in Code Section 152, without regard to Code Section 152(b)(l), (b)(2), and (d)(l)(B)) may also constitute an unforeseeable Emergency. Adequate proof of Unforeseeable Emergency must be provided to the Administrative Committee. Withdrawals for Unforeseeable Emergency may not exceed the lesser of (i) the balance of the Participant's Distribution Accounts and (ii) the amount reasonably necessary to satisfy the Unforeseeable Emergency plus taxes reasonably anticipated as a result of the payout and may be made only if the Administrative Committee finds that the Unforeseeable Emergency may not be relieved through reimbursement or compensation from insurance or otherwise or by liquidation of the Participant's assets, to the extent the liquidation of such assets would not cause severe financial hardship. Any withdrawal for Unforeseeable Emergency will be made within 90 days of the occurrence of the Unforeseeable Emergency. If a distribution on account of an Unforeseeable Emergency is granted, deferrals for the remainder of that calendar year shall cease.

Withdrawals for Unforeseeable Emergency shall be made in the following order: (I) from the Distribution Account with the closest payment date to the date of withdrawal; (2) to the extent not yet

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satisfied, from the Distribution Account with the next closest payment date, and so forth. Amounts distributed from each Distribution Account shall be taken pro rata from all Investment Accounts within that specified Distribution Account.

5.04 Distribution Upon Death

If any Participant dies when installment payments are being paid to the Participant, the unpaid amounts in the Participant's Distribution Accounts shall be paid to the Participant's Beneficiary in accordance with the time period selected by the Participant. If any Participant dies when installment payments are not being paid to the Participant, such unpaid amounts shall be paid to the designated Beneficiary beginning in the year after the Participant's death, and shall be paid in accordance with the time period selected by the Participant for payments at termination of employment. If any Participant dies who selected a lump sum distribution that has not yet been paid, such lump sum distribution shall be paid to the Participant's Beneficiary in the year after the Participant's death. If a Beneficiary dies after the Participant but before payments have commenced, payment will be made to the Beneficiary's estate in a single lump sum. If a Participant fails to designate a beneficiary, the amounts payable hereunder shall be made to the Participant's estate in a single lump sum. If a Beneficiary predeceases the Participant, amounts payable hereunder shall be made to the contingent Beneficiary, but if none or if not living, payments shall be made to the Participant's estate in a single lump sum.

5.05 Form of Distribution

All distributions will be in the form of cash.

5.06 Prohibition on Acceleration of Payments

The time or schedule of any payment or amount scheduled to be paid pursuant to the terms of the Plan may not be accelerated except as otherwise permitted under Code section 409A and the guidance and Treasury regulations issued thereunder.

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SECTION 6

Miscellaneous

6.01 Participant's Rights and Interest in the Accounts

No provision in this Plan shall be construed to give any Participant the right to be retained in the Company's or a Subsidiary's service or to any benefits not specifically provided by the Plan. Neither a Participant nor a Beneficiary shall have any interest in the deferred compensation or earnings credited to his accounts other than as an unsecured general creditor of the Company. All amounts deferred or otherwise held for the account of a Participant or a Beneficiary under the Plan shall remain the sole property of the Company or Subsidiary. The Company may or may not decide to purchase an annuity or insurance contract intended to mirror the performance of the investment elections made by the Participants or Beneficiaries, but in all circumstances such annuity or insurance contract will be owned by the Company.

6.02 Nonalienability and Nontransferability

The rights of a Participant to the payment of deferred compensation as provided in the Plan shall not be assigned, transferred, pledged or encumbered, or be subject in any manner to alienation or anticipation. No Participant may borrow against his Accounts. No

Accounts shall be subject in any manner to anticipation, alienation, sale, transfer, assignment, pledge, encumbrance, charge, garnishment, execution, or levy of any kind, whether voluntary or involuntary, including any liability which is for alimony or other payments for the support of a spouse or former spouse, or for any other relative of any Participant.

6.03 Plan Administrator

The administrator of the Plan shall be the Administrative Committee, which shall have authority to adopt rules and regulations for carrying out the Plan, to delegate its administrative responsibilities as it shall, from time to time, deem advisable, and to interpret, construe, and implement the provisions thereof, in its complete discretion. Any decision or interpretation of any provision of the Plan adopted by the Administrative Committee shall be final and conclusive.

If a recapitalization, stock dividend (including a spinoff dividend), combination or exchange of shares, merger, consolidation, rights offering, separation, reorganization, liquidation or any other change in the corporate structure of Aon plc or its shares occurs, the RPGIC may make such equitable adjustments to prevent the enlargement or dilution of rights, as it may deem appropriate in the number and class of Aon plc Class A Ordinary Shares so credited.

6.04 Amendment and Termination

The Plan may, at any time, be amended or modified, or, subject to and in compliance with Code Section 409A, terminated by action of the Board. No amendment, modification, or termination shall, without the consent of a Participant, adversely affect such Participant's rights with respect to amounts accrued in his or her Accounts.

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SECTION 7

General Provisions

7.01 Controlling Law

Except to the extent superseded by federal law, the laws of Illinois shall be controlling in all matters relating to the Plan.

7.02 Facility of Payment

Any amounts payable hereunder to any person under legal disability or who, in the judgment of the Administrative Committee, is unable to properly manage his financial affairs may be paid to the legal representative of such person or may be applied for the benefit of such person in any manner which the Administrative Committee may select.

7.03 Withholding of Payroll Taxes

The Company shall withhold from such payments any taxes required to be withheld for federal, state, or local government purposes.

7.04 Liability

No member of the Board, no employee of Aon plc, the Company or a Subsidiary, and no member of the Administrative Committee or RPGIC itself shall be liable for any act or action hereunder whether of omission or commission, by any other member or employee or by any agent to whom duties in connection with the administration of the Plan have been delegated or, except in circumstances involving his bad faith, gross negligence or fraud, for anything done or omitted to be done by himself. The Company will fully indemnify and hold the members of the Administrative Committee and the RPGIC harmless from any liability hereunder, except in circumstances involving an Administrative Committee or RPGIC member's bad faith, gross negligence, or fraud.

7.05 Successors

The provisions of the Plan shall bind and inure to the benefit of the Company and its successors and assigns. The term "successors" as used herein shall include any corporation or other business entity which shall by merger, consolidation, purchase, or otherwise, acquire all or substantially all of the business and assets of the Company and successors of any such corporation or other business entity.

7.06 Code Section 409A

The Plan and the benefits provided hereunder are intended to comply with Code Section 409A and the guidance and Treasury regulations issued thereunder, to the extent applicable thereto. Notwithstanding any provision of the Plan to the contrary, the Plan shall be interpreted and construed consistent with this intent. Notwithstanding the foregoing, the Company shall not be required to assume any increased economic burden in connection therewith. Although the Company and the Administrative Committee intend to administer the Plan so that it will comply with the requirements of Code Section 409A, neither the Company nor the Administrative Committee represents or warrants that the Plan will comply with Code Section 409A or any other provision of federal, state, local, or non-United States law. Neither the Company, its Subsidiaries, nor their respective directors, officers, employees or advisers shall be liable to any Participant (or any other individual claiming a benefit through the Participant) for any tax, interest, or penalties the Participant might owe as a result of participation in the Plan, and the Company and its Subsidiaries shall have no obligation to indemnify or otherwise protect any Participant from the obligation to pay any taxes pursuant to Code Section 409A.

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IN WITNESS WHEREOF, Aon Corporation has adopted the Aon Deferred Compensation Plan (As Amended and Restated Effective as of September 20, 2013), as of the 20^th day of September 2013.

AON CORPORATION	AON CORPORATION
By:	By:
/s/ Christa Davies	/s/ Gregory J. Besio
Christa Davies	Gregory J. Besio
Executive Vice President and	Executive Vice President and Chief
Chief Financial Officer	Human Resources Officer

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EX-12.1

Exhibit 12.1

Aon plc and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Nine Months Ended September 30,				Years Ended December 31,
(millions except ratio)	2013		2012		2012		2011		2010			2009		2008
Income from continuing operations before income taxes and noncontrolling interests	$	1,063	$	971	$	1,381	$	1,384	$	1,059		$	949	$	879
Less: Equity in earnings on less than 50% owned entities	12		8		13		7		10			11		5
Add back fixed charges:
Interest on indebtedness	153		173		228		245		182			122		126
Interest on uncertain tax positions	—		3		5		—		(1		)	2		—
Portion of rents representative of interest factor	36		27		42		55		48			48		47
Income as adjusted	$	1,240	$	1,166	$	1,643	$	1,677	$	1,278		$	1,110	$	1,047
Fixed charges:
Interest on indebtedness	$	153	$	173	$	228	$	245	$	182		$	122	$	126
Interest on uncertain tax positions	—		3		5		—		(1		)	2		—
Portion of rents representative of interest factor	36		27		42		55		48			48		47
Total fixed charges	$	189	$	203	$	275	$	300	$	229		$	172	$	173
Ratio of earnings to fixed charges	6.6		5.7		6.0		5.6		5.6			6.5		6.1

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, 2013	/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, 2013	/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, 2013 (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, 2013

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, 2013 (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, 2013

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Shareholders' Equity

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

Ordinary Shares

In April 2012, the Company’s Board of Directors authorized a share repurchase program under which up to $5.0 billion of Class A Ordinary Shares may be repurchased (“2012 Share Repurchase Program”). Under this program, 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.

In the third quarter of 2013, the Company repurchased 7.3 million shares at an average price per share of $68.33 for a total cost of $500 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2013, the Company repurchased 15.8 million shares at an average price per share of $64.79 for a total cost of $1.0 billion under the 2012 Share Repurchase Program.  In the third quarter of 2012, the Company repurchased 5.4 million shares at an average price per share of $51.37 for a total cost of $275 million under the 2012 Share Repurchase Program. During the nine months ended September 30, 2012, the Company repurchased 12.7 million shares at an average price per share of $49.22 for a total cost of $625 million under the 2012 Share Repurchase Program and the previously completed 2010 Share Repurchase Program. The remaining authorized amount for share repurchase under the 2012 Share Repurchase Program is $3.0 billion. Since the inception of the 2012 Share Repurchase Program, the Company repurchased a total of 35.3 million shares for an aggregate cost of $2.0 billion.

Participating Securities

Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents, whether paid or unpaid, are participating securities, as defined, and therefore, should be included in computing basic and diluted earnings per share using the two class method.  Certain of the Company’s restricted share awards allow the holder to receive a non-forfeitable dividend equivalent.

Income from continuing operations, income from discontinued operations and net income, attributable to participating securities, were as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Income from continuing operations	$	3	$	2	$	8	$	8
Income from discontinued operations	—		—		—		—
Net income	$	3	$	2	$	8	$	8

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

	Three months ended September 30,		Nine months ended September 30,
	2013	2012	2013	2012
Shares for basic earnings per share (1)	309.5	327.3	313.2	330.6
Common stock equivalents	3.4	3.7	3.5	3.8
Shares for diluted earnings per share	312.9	331.0	316.7	334.4

   ______________________________________________

(1) Includes 3.8 million and 4.5 million of participating securities for the three months ended September 30, 2013 and 2012, respectively, and 4.0 million and 4.7 million of participating securities for the nine months ended September 30, 2013 and 2012, respectively.

Certain ordinary share equivalents were not included in the computation of diluted net income per share because their inclusion would have been antidilutive.  There were no shares excluded from the calculation for the three and nine months ended September 30, 2013. The number of shares excluded from the calculation was 0.1 million for both the three and nine months ended September 30, 2012, respectively.

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 Investments (1)			Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments			Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2012	$	—		$	(28	)	$	233		$	(2,815	)	$	(2,610	)
Other comprehensive income (loss) before reclassifications, net	12			(24		)	(78		)	(4		)	(94		)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	(20		)	20			—			100			100
Tax benefit	7			(8		)	—			(31		)	(32		)
Amounts reclassified from accumulated other comprehensive loss, net	(13		)	12			—			69			68
Net current period other comprehensive (loss) income	(1		)	(12		)	(78		)	65			(26		)
Balance at September 30, 2013	$	(1	)	$	(40	)	$	155		$	(2,750	)	$	(2,636	)

______________________________________________

(1) Reclassifications from Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from Accumulated other comprehensive loss are recorded in Compensation and benefits

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Share-Based Compensation Plans (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Closing share price (in dollars per share)	$ 74.44		$ 74.44
Aggregate intrinsic value of options outstanding	$ 163		$ 163
Aggregate intrinsic value of exercisable options outstanding	156		156
Aggregate intrinsic value of stock options exercised	14	23	53	47
Cash received from the exercise of stock options	14	29	55	80
Tax benefit realized from the exercise of stock options	3	5	10	8
Unamortized deferred compensation expense	$ 373		$ 373
Remaining weighted-average amortization period (in years)			2 years 1 month 12 days

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Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 369	$ 291
Short-term investments	357	346
Receivables, net	2,666	3,101
Fiduciary assets	11,698	12,214
Other current assets	484	430
Total Current Assets	15,574	16,382
Goodwill	8,958	8,943
Intangible assets, net	2,657	2,975
Fixed assets, net	803	820
Investments	139	165
Other non-current assets	1,174	1,201
TOTAL ASSETS	29,305	30,486
CURRENT LIABILITIES
Fiduciary liabilities	11,698	12,214
Short-term debt and current portion of long-term debt	1,206	452
Accounts payable and accrued liabilities	1,523	1,853
Other current liabilities	764	831
Total Current Liabilities	15,191	15,350
Long-term debt	3,352	3,713
Pension, other post-retirement and other post-employment liabilities	1,773	2,276
Other non-current liabilities	1,399	1,342
TOTAL LIABILITIES	21,715	22,681
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2013 - 301.0; 2012 - 310.9)	3	3
Additional paid-in capital	4,660	4,436
Retained earnings	5,507	5,933
Accumulated other comprehensive loss	(2,636)	(2,610)
TOTAL AON SHAREHOLDERS’ EQUITY	7,534	7,762
Noncontrolling interests	56	43
TOTAL EQUITY	7,590	7,805
TOTAL LIABILITIES AND EQUITY	$ 29,305	$ 30,486

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Cash and Cash Equivalents

9 Months Ended

Sep. 30, 2013

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

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include cash balances and all highly liquid investments with initial maturities of three months or less.  Short-term investments include certificates of deposit, money market funds and highly liquid debt instruments purchased with initial maturities in excess of three months but less than one year and are carried at amortized cost, which approximates fair value.

The Company is required to hold £77 million of operating funds in the U.K. as required by the Financial Conduct Authority, which were included in Short-term investments.  These operating funds, when translated to U.S. dollars, were $124 million at both September 30, 2013 and December 31, 2012, respectively.  Cash and cash equivalents included restricted balances of $88 million and $76 million at September 30, 2013 and December 31, 2012, respectively. The restricted balances primarily relate to cash required to be held as collateral.

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Guarantee of Registered Securities

9 Months Ended

Sep. 30, 2013

Guarantee of Registered Securities [Abstract]

Guarantee of Registered Securities

Guarantee of Registered Securities

As described in Note 15, 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. Aon Corporation is a 100% directly owned subsidiary of Aon plc. The debt securities that are subject to Rule 3-10 of Regulation S-X are the 3.50% senior notes due September 2015, the 3.125% senior notes due May 2016, the 5.00% senior notes due September 2020, the 8.205% junior subordinated deferrable interest debentures due January 2027 and the 6.25% senior notes due September 2040. All guarantees of Aon plc are full and unconditional. There are no other subsidiaries of Aon plc that are guarantors of the debt.

Aon Corporation entered into an agreement pursuant to which it agreed to guarantee the obligations of Aon plc arising under the 4.250% Notes Due 2042 exchanged for Aon Corporation's outstanding 8.205% junior subordinated deferrable interest debentures due January 2027 in both Original Notes and Exchange Notes form as described in Note 9. Those notes are subject to Rule 3-10 of Regulation S-X. Aon Corporation also agreed to guarantee the obligations of Aon plc arising under the 4.45% Notes Due 2043 issued on May 21, 2013. 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 4.250% Notes Due 2042 or the 4.45% Notes Due 2043.

The following tables set forth condensed consolidating statements of income for the three and nine months endedSeptember 30, 2013 and 2012, condensed consolidating statements of comprehensive income for the three and nine months endedSeptember 30, 2013 and 2012, condensed consolidating statements of financial position as of September 30, 2013 and December 31, 2012, and condensed consolidating statements of cash flows for the nine months ended September 30, 2013 and 2012 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 non-guarantor subsidiaries. The condensed consolidating financial statements are presented in all periods as a merger under common control, with Aon plc presented as the parent company in all periods prior and subsequent to the Redomestication. The principal consolidating adjustments are to eliminate the investment in subsidiaries and intercompany balances and transactions.

In July 2013, Aon Holdings LLC, an intermediate holding company and the direct parent of Aon Corporation, transferred its ownership of Aon Corporation to Aon plc via distribution. The financial results of Aon Holdings LLC were included in the Other Non-Guarantor Subsidiaries column of the Condensed Consolidating Financial Statements. The Company has reflected the transfer of Aon Corporation from Aon Holdings LLC to Aon plc below for all periods presented.

Condensed Consolidating Statement of Income

	Three months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,785		$	—		$	2,786
Fiduciary investment income	—			—			8			—			8
Total revenue	1			—			2,793			—			2,794
Expenses
Compensation and benefits	11			14			1,641			—			1,666
Other general expenses	—			5			759			—			764
Total operating expenses	11			19			2,400			—			2,430
Operating (loss) income	(10		)	(19		)	393			—			364
Interest income	—			1			2			—			3
Interest expense	(6		)	(39		)	(8		)	—			(53		)
Intercompany interest income (expense)	25			11			(36		)	—			—
Other income	—			13			26			—			39
Income (loss) from continuing operations before taxes	9			(33		)	377			—			353
Income tax (benefit) expense	(2		)	(14		)	105			—			89
Income (loss) from continuing operations	11			(19		)	272			—			264
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	245			127			—			(372		)	—
Net income	256			108			272			(372		)	264
Less: Net income attributable to noncontrolling interests	—			—			8			—			8
Net income attributable to Aon shareholders	$	256		$	108		$	264		$	(372	)	$	256

Condensed Consolidating Statement of Income

	Three months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	2,726		$	—		$	2,726
Fiduciary investment income	—			—			11			—			11
Total revenue	—			—			2,737			—			2,737
Expenses
Compensation and benefits	4			(5		)	1,621			—			1,620
Other general expenses	19			6			753			—			778
Total operating expenses	23			1			2,374			—			2,398
Operating (loss) income	(23		)	(1		)	363			—			339
Interest income	—			—			1			—			1
Interest expense	—			(45		)	(12		)	—			(57		)
Intercompany interest (expense) income	(8		)	48			(40		)	—			—
Other income (expense)	—			10			(19		)	—			(9		)
(Loss) income from continuing operations before taxes	(31		)	12			293			—			274
Income tax (benefit) expense	(3		)	16			51			—			64
(Loss) income from continuing operations	(28		)	(4		)	242			—			210
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	232			186			—			(418		)	—
Net income	204			182			242			(418		)	210
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income attributable to Aon shareholders	$	204		$	182		$	236		$	(418	)	$	204

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	2		$	—		$	8,583		$	—		$	8,585
Fiduciary investment income	—			—			21			—			21
Total revenue	2			—			8,604			—			8,606
Expenses
Compensation and benefits	27			34			5,042			—			5,103
Other general expenses	14			29			2,304			—			2,347
Total operating expenses	41			63			7,346			—			7,450
Operating (loss) income	(39		)	(63		)	1,258			—			1,156
Interest income	1			2			3			—			6
Interest expense	(12		)	(106		)	(35		)	—			(153		)
Intercompany interest income (expense)	11			96			(107		)	—			—
Other income	—			10			44			—			54
(Loss) income from continuing operations before taxes	(39		)	(61		)	1,163			—			1,063
Income tax (benefit) expense	(11		)	(24		)	310			—			275
(Loss) income from continuing operations	(28		)	(37		)	853			—			788
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	786			617			—			(1,403		)	—
Net income	758			580			853			(1,403		)	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	8,368		$	—		$	8,368
Fiduciary investment income	—			1			30			—			31
Total revenue	—			1			8,398			—			8,399
Expenses
Compensation and benefits	—			31			4,889			—			4,920
Other general expenses	20			27			2,297			—			2,344
Total operating expenses	20			58			7,186			—			7,264
Operating (loss) income	(20		)	(57		)	1,212			—			1,135
Interest income	—			1			5			—			6
Interest expense	—			(125		)	(48		)	—			(173		)
Intercompany interest (expense) income	(11		)	141			(130		)	—			—
Other income (expense)	—			13			(10		)	—			3
(Loss) income from continuing operations before taxes	(31		)	(27		)	1,029			—			971
Income tax (benefit) expense	(4		)	(11		)	272			—			257
(Loss) income from continuing operations	(27		)	(16		)	757			—			714
Loss from discontinued operations before taxes	—			—			(1		)	—			(1		)
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			(1		)	—			(1		)
Equity in earnings of subsidiaries, net of tax	715			598			—			(1,313		)	—
Net income	688			582			756			(1,313		)	713
Less: Net income attributable to noncontrolling interests	—			—			25			—			25
Net income attributable to Aon shareholders	$	688		$	582		$	731		$	(1,313	)	$	688

Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2013
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	256	$	108		$	272		$	(372	)	$	264
Less: Net income attributable to noncontrolling interests	—		—			8			—			8
Net income attributable to Aon shareholders	$	256	$	108		$	264		$	(372	)	$	256
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		(4		)	(10		)	—			(14		)
Change in fair value of derivatives	—		2			7			—			9
Foreign currency translation adjustments	—		6			149			—			155
Post-retirement benefit obligation	—		7			17			—			24
Total other comprehensive income	—		11			163			—			174
Equity in other comprehensive loss of subsidiaries, net of tax	170		157			—			(327		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			3			—			3
Total other comprehensive income attributable to Aon shareholders	170		168			160			(327		)	171
Comprehensive income attributable to Aon shareholders	$	426	$	276		$	424		$	(699	)	$	427

Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor			Consolidating
(millions)	plc		Corporation		Subsidiaries			Adjustments			Consolidated
Net income	$	204	$	182	$	242		$	(418	)	$	210
Less: Net income attributable to noncontrolling interests	—		—		6			—			6
Net income attributable to Aon shareholders	$	204	$	182	$	236		$	(418	)	$	204
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—		—		—			—			—
Change in fair value of derivatives	—		1		14			—			15
Foreign currency translation adjustments	—		17		147			—			164
Post-retirement benefit obligation	—		9		(2		)	—			7
Total other comprehensive income	—		27		159			—			186
Equity in other comprehensive income of subsidiaries, net of tax	182		168		—			(350		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		4			—			4
Total other comprehensive income attributable to Aon shareholders	182		195		155			(350		)	182
Comprehensive income attributable to Aon Shareholders	$	386	$	377	$	391		$	(768	)	$	386

Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	758		$	580		$	853		$	(1,403	)	$	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—			—			(1		)	—			(1		)
Change in fair value of derivatives	—			5			(17		)	—			(12		)
Foreign currency translation adjustments	—			(14		)	(63		)	—			(77		)
Post-retirement benefit obligation	—			22			43			—			65
Total other comprehensive income (loss)	—			13			(38		)	—			(25		)
Equity in other comprehensive loss of subsidiaries, net of tax	(27		)	(38		)	—			65			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			1			—			1
Total other comprehensive loss attributable to Aon shareholders	(27		)	(25		)	(39		)	65			(26		)
Comprehensive income attributable to Aon shareholders	$	731		$	555		$	784		$	(1,338	)	$	732

Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
Net income	$	688	$	582	$	756	$	(1,313	)	$	713
Less: Net income attributable to noncontrolling interests	—		—		25		—			25
Net income attributable to Aon shareholders	$	688	$	582	$	731	$	(1,313	)	$	688
Other comprehensive income, net of tax:
Change in fair value of investments	—		—		—		—			—
Change in fair value of derivatives	—		1		4		—			5
Foreign currency translation adjustments	—		16		55		—			71
Post-retirement benefit obligation	—		24		22		—			46
Total other comprehensive income	—		41		81		—			122
Equity in other comprehensive income of subsidiaries, net of tax	120		92		—		(212		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		2		—			2
Total other comprehensive income attributable to Aon shareholders	120		133		79		(212		)	120
Comprehensive income attributable to Aon Shareholders	$	808	$	715	$	810	$	(1,525	)	$	808

Condensed Consolidating Statement of Financial Position

	As of September 30, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	118	$	291	$	—	$	(40	)	$	369
Short-term investments	—		124		233		—			357
Receivables, net	—		5		2,661		—			2,666
Fiduciary assets	—		—		11,698		—			11,698
Intercompany receivables	41		3,250		6,176		(9,467		)	—
Other current assets	19		59		406		—			484
Total Current Assets	178		3,729		21,174		(9,507		)	15,574
Goodwill	—		—		8,958		—			8,958
Intangible assets, net	—		—		2,657		—			2,657
Fixed assets, net	—		—		803		—			803
Investments	—		53		86		—			139
Intercompany receivables	7,166		2,181		2,195		(11,542		)	—
Other non-current assets	119		748		408		(101		)	1,174
Investment in subsidiary	4,306		11,187		—		(15,493		)	—
TOTAL ASSETS	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,698	$	—		$	11,698
Short-term debt and current portion of long-term debt	361		148		697		—			1,206
Accounts payable and accrued liabilities	16		41		1,506		(40		)	1,523
Intercompany payables	1,308		4,727		3,430		(9,465		)	—
Other current liabilities	1		47		718		(2		)	764
Total Current Liabilities	1,686		4,963		18,049		(9,507		)	15,191
Long-term debt	443		2,516		393		—			3,352
Pension, other post-retirement and other post-employment liabilities	—		1,162		611		—			1,773
Intercompany payables	2,100		7,262		2,180		(11,542		)	—
Other non-current liabilities	6		260		1,234		(101		)	1,399
TOTAL LIABILITIES	4,235		16,163		22,467		(21,150		)	21,715
TOTAL AON SHAREHOLDERS’ EQUITY	7,534		1,735		13,758		(15,493		)	7,534
Noncontrolling interests	—		—		56		—			56
TOTAL EQUITY	7,534		1,735		13,814		(15,493		)	7,590
TOTAL LIABILITIES AND EQUITY	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305

Condensed Consolidating Statement of Financial Position

	As of December 31, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	131	$	199	$	—	$	(39	)	$	291
Short-term investments	—		89		257		—			346
Receivables, net	5		1		3,095		—			3,101
Fiduciary assets	—		—		12,214		—			12,214
Intercompany receivables	—		2,092		3,545		(5,637		)	—
Other current assets	7		53		370		—			430
Total Current Assets	143		2,434		19,481		(5,676		)	16,382
Goodwill	—		—		8,943		—			8,943
Intangible assets, net	—		—		2,975		—			2,975
Fixed assets, net	—		—		820		—			820
Investments	—		49		116		—			165
Intercompany receivables	166		1,997		2,350		(4,513		)	—
Other non-current assets	117		735		1,174		(825		)	1,201
Investment in subsidiary	10,398		10,208		—		(20,606		)	—
TOTAL ASSETS	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,214	$	—		$	12,214
Short-term debt and current portion of long-term debt	—		429		23		—			452
Accounts payable and accrued liabilities	10		71		1,811		(39		)	1,853
Intercompany payables	51		2,637		2,162		(4,850		)	—
Other current liabilities	—		49		779		3			831
Total Current Liabilities	61		3,186		16,989		(4,886		)	15,350
Long-term debt	107		2,515		1,091		—			3,713
Pension, other post-retirement and other post-employment liabilities	—		1,294		982		—			2,276
Intercompany payables	2,890		166		2,247		(5,303		)	—
Other non-current liabilities	4		254		1,909		(825		)	1,342
TOTAL LIABILITIES	3,062		7,415		23,218		(11,014		)	22,681
TOTAL AON SHAREHOLDERS’ EQUITY	7,762		8,008		12,598		(20,606		)	7,762
Noncontrolling interests	—		—		43		—			43
TOTAL EQUITY	7,762		8,008		12,641		(20,606		)	7,805
TOTAL LIABILITIES AND EQUITY	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2013
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	(14	)	$	(195	)	$	1,193		$	—		$	984
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			8			73			—			81
Purchase of long-term investments	—			(13		)	—			—			(13		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(35		)	22			—			(13		)
Acquisition of businesses, net of cash acquired	—			—			(26		)	—			(26		)
Proceeds from sale of businesses	—			—			6			—			6
Capital expenditures	—			—			(174		)	—			(174		)
CASH USED FOR INVESTING ACTIVITIES	—			(40		)	(99		)	—			(139		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025		)	—			—			—			(1,025		)
Advances from (to) affiliates	405			610			(1,014		)	(1		)	—
Issuance of shares for employee benefit plans	84			—			—			—			84
Issuance of debt	1,145			2,894			231			—			4,270
Repayment of debt	(449		)	(3,177		)	(244		)	—			(3,870		)
Cash dividends to shareholders	(159		)	—			—			—			(159		)
Purchase of shares from noncontrolling interests	—			—			(6		)	—			(6		)
Dividends paid to noncontrolling interests	—			—			(13		)	—			(13		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	1			327			(1,046		)	(1		)	(719		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(48		)	—			(48		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(13		)	92			—			(1		)	78
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	118		$	291		$	—		$	(40	)	$	369

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH (USED FOR) PROVIDED BY OPERATING ACTIVITIES	$	(46	)	$	(189	)	$	1,102		$	—	$	867
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			79			92			—		171
Purchase of long-term investments	—			(9		)	—			—		(9		)
Net (purchases) sales of short-term investments - non-fiduciary	(16		)	61			21			—		66
Acquisition of businesses, net of cash acquired	—			(55		)	(42		)	—		(97		)
Proceeds from sale of businesses	—			—			2			—		2
Capital expenditures	—			—			(201		)	—		(201		)
CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES	(16		)	76			(128		)	—		(68		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(525		)	(100		)	—			—		(625		)
Advances from (to) affiliates	648			376			(1,024		)	—		—
Issuance of shares for employee benefit plans	44			49			—			—		93
Issuance of debt	—			332			1			—		333
Repayment of debt	—			(416		)	(11		)	—		(427		)
Cash dividends to shareholders	(104		)	(49		)	—			—		(153		)
Purchase of shares from noncontrolling interests	—			—			—			—		—
Dividends paid to noncontrolling interests	—			—			(17		)	—		(17		)
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES	63			192			(1,051		)	—		(796		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			15			—		15
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1			79			(62		)	—		18
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			(21		)	293			—		272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	1		$	58		$	231		$	—	$	290

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Derivatives and Hedging (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 1		$ 8		$ (8)		$ 8
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	27				27
Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		16		(28)		(14)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(10)		(7)		(8)		(23)
Interest rate contracts [Member] | Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		0		0		0
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	0	[1]	0	[1]	(1)	[2]	0	[2]
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	0		0		0		0
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		16		(28)		(14)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(10)	[3]	(7)	[3]	(7)	[3]	(23)	[3]
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		3		0		4
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Fair value hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	(7)	[4],[5]	(3)	[4],[5]	(8)	[4],[5]	0	[4],[5]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	7	[4]	3	[4]	8	[4],[5]	0	[4],[5]
Foreign exchange contracts [Member] | Derivatives not accounted for as hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 3		$ 6		$ (15)		$ 12

[1] Included within Other current assets or Other non-current assets

[2] Included within Fiduciary investment income and Interest expense

[3] Included within Other income (expense) and Interest expense

[4] Included in Interest expense

[5] Relates to fixed rate debt

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Employee Benefits

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

Employee Benefits

The following table provides the components of the net periodic benefit cost for Aon’s U.S. pension plans, along with its most significant international pension plans, which are located in the U.K., the Netherlands and Canada (in millions):

	Three months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	5		$	4		$	—		$	—
Interest cost	63			66			28			29
Expected return on plan assets	(89		)	(80		)	(34		)	(31		)
Amortization of net actuarial loss	18			15			13			10
Net periodic (benefit) cost	$	(3	)	$	5		$	7		$	8

	Nine months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	14		$	12		$	—		$	—
Interest cost	189			198			84			89
Expected return on plan assets	(267		)	(241		)	(103		)	(95		)
Amortization of net actuarial loss	55			44			39			32
Net periodic (benefit) cost	$	(9	)	$	13		$	20		$	26

Based on current assumptions, in 2013, Aon plans to contribute $167 million and $381 million to its U.S. and most significant international defined benefit pension plans, respectively. During the three months ended September 30, 2013, contributions of $54 million were made to the Company's U.S. pension plans and $59 million were made to its most significant international pension plans. During the nine months ended September 30, 2013, contributions of $122 million were made to the Company’s U.S. pension plans and $290 million were made to its most significant international pension plans.

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Shareholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended				9 Months Ended				18 Months Ended
	Apr. 30, 2012	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013
Common Stock Programs
Total cost of shares purchased						$ 1,025,000,000
Weighted average shares outstanding
Shares for basic earnings per share		309.5	[1]	327.3	[1]	313.2	[1]	330.6	[1]
Common stock equivalents (in shares)		3.4		3.7		3.5		3.8
Shares for diluted earnings per share		312.9		331.0		316.7		334.4
Number of participating securities (in shares)		3.8		4.5		4.0		4.7
Number of shares excluded from the calculation of diluted earnings per share		0		0.1		0		0.1
2012 - Share Repurchase Program [Member]
Common Stock Programs
Share repurchase authorization limit	5,000,000,000
Shares purchased (in shares)		7.3		5.4		15.8		12.7		35.3
Average price per share of stock repurchased		$ 68.33		$ 51.37		$ 64.79		$ 49.22
Total cost of shares purchased		500,000,000		275,000,000		1,000,000,000		625,000,000		2,000,000,000
Share repurchase, remaining authorization limit		$ 3,000,000,000

[1] Includes 3.8 million and 4.5 million of participating securities for the three months ended September 30, 2013 and 2012, respectively, and 4.0 million and 4.7 million of participating securities for the nine months ended September 30, 2013 and 2012, respectively.

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Fair Value and Financial Instruments (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Fair Value [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Fair Value [Member] Money market funds and highly liquid debt securities Recurring [Member]		Sep. 30, 2013 Fair Value [Member] Money market funds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Money market funds [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Highly liquid debt securities [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Highly liquid debt securities [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Government bonds [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Equity securities [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Sep. 30, 2013 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] Recurring [Member]	Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] Recurring [Member]	Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] Recurring [Member]	Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] Recurring [Member]	Sep. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] Recurring [Member]	Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] Recurring [Member]	Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] Recurring [Member]	Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] Recurring [Member]	Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] Recurring [Member]	Sep. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] Recurring [Member]	Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] Recurring [Member]	Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] Recurring [Member]	Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] Recurring [Member]	Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] Recurring [Member]	Sep. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member] Recurring [Member]
Fair Value Disclosures [Abstract]
Net assets value (in dollar per share)	$ 1
Assets:
Money market funds and highly liquid debt securities		$ 2,098	[1]	$ 2,133	[2]	$ 2,073	$ 2,108	$ 25	$ 25											$ 2,073	[1]	$ 2,108	[2]											$ 25	[1]	$ 25	[2]											$ 0	[1]	$ 0	[2]
Other investments										2	12	7	8	9	5									0	0	0	0	5	5									0	0	7	8	4	0									2	12	0	0	0	0
Derivatives																8	17	57	193											0	0	0	0											8	17	57	193											0	0	0	0
Liabilities:
Derivatives																		$ 113	$ 251													$ 0	$ 0													$ 113	$ 251													$ 0	$ 0

[1] Includes $2,073 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.

[2] Includes $2,108 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 “Investments” for additional information regarding the Company’s investments.

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Other Income (Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other (Expense) Income
Equity earnings	$ 6	$ 0	$ 12	$ 8
Gains on investments	37	9	36	11
Foreign currency remeasurement (losses) gains	(4)	(24)	15	(24)
Derivative gains (losses)	1	8	(8)	8
Other	(1)	(2)	(1)	0
Other Income	$ 39	$ (9)	$ 54	$ 3

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the net carrying amount of goodwill by operating segment

The change in the net carrying amount of goodwill by reportable segment for the nine months ended September 30, 2013 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2012	$	5,982		$	2,961		$	8,943
Goodwill related to current year acquisitions	24			2			26
Goodwill related to disposals	(3		)	—			(3		)
Goodwill related to prior year acquisitions	(2		)	17			15
Foreign currency translation	(19		)	(4		)	(23		)
Balance as of September 30, 2013	$	5,982		$	2,976		$	8,958

Schedule of other intangible assets by asset class

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

	September 30, 2013						December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,025	$	—	$	1,025	$	1,025	$	—	$	1,025
Intangible assets with finite lives:
Customer related and contract based	2,686		1,218		1,468		2,714		969		1,745
Marketing, technology and other (1)	611		447		164		619		414		205
	$	4,322	$	1,665	$	2,657	$	4,358	$	1,383	$	2,975

 ______________________________________________

(1) Tradenames with finite lives disclosed separately in prior years are now presented in Marketing, technology and other

Schedule of estimated future amortization expense on intangible assets

The estimated future amortization for finite lived intangible assets as of September 30, 2013 is as follows (in millions):

	HR Solutions		Risk Solutions		Total
Remainder of 2013	$	70	$	28	$	98
2014	243		95		338
2015	212		79		291
2016	177		67		244
2017	140		56		196
Thereafter	342		123		465
	$	1,184	$	448	$	1,632

XML

Acquisitions and Dispositions (Tables)

9 Months Ended

Sep. 30, 2013

Business Combinations [Abstract]

Consideration transferred and preliminary value of intangible assets

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions:

	Nine months ended September 30,
(millions)	2013		2012
Consideration	$	26	$	110
Intangible assets:
Goodwill	$	26	$	60
Other intangible assets	8		56
Total	$	34	$	116

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Debt (Details)				3 Months Ended	9 Months Ended
	Sep. 30, 2013 USD ($)	May 08, 2013 EUR (€)	Dec. 31, 2012 USD ($)	Sep. 30, 2013 Commercial paper [Member] USD ($)	Sep. 30, 2013 Commercial paper [Member] USD ($)	Dec. 31, 2012 Commercial paper [Member] USD ($)	Sep. 30, 2013 Securities Due July 2014 [Member] USD ($)	Sep. 30, 2013 Securities Due July 2014 [Member] EUR (€)	Apr. 15, 2013 4.250% Senior notes due 2042 [Member] USD ($)	Mar. 08, 2013 4.250% Senior notes due 2042 [Member] USD ($)	Dec. 12, 2012 4.250% Senior notes due 2042 [Member] USD ($)	May 21, 2013 4.45% notes due 2043 [Member] USD ($)
Debt Instrument
Total debt				$ 511,000,000	$ 511,000,000	$ 50,000,000
Weighted average commercial paper outstanding				524,000,000	349,000,000
Weighted-average interest rates (as a percent)				0.33%	0.35%
Short-term debt and current portion of long-term debt	1,206,000,000		452,000,000				674,000,000	500,000,000
Face amount of debt									256,000,000	90,000,000		250,000,000
Stated interest rate									4.25%	4.25%	4.25%	4.45%
Short-term debt aggregate principal amount											166,000,000
Credit facility maximum borrowing amount		€ 650,000,000

XML

Fair Value and Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

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, 2013 and December 31, 2012 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2013		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 and highly liquid debt securities (1)	$	2,098	$	2,073	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	9		5		4		—
Derivatives:
Interest rate contracts	8		—		8		—
Foreign exchange contracts	57		—		57		—
Liabilities:
Derivatives:
Foreign exchange contracts	113		—		113		—

  ______________________________________________

(1) Includes $2,073 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

			Fair Value Measurements Using
	Balance at December 31, 2012		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 and highly liquid debt securities (1)	$	2,133	$	2,108	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	12		—		—		12
Government Bonds	8		—		8		—
Equity securities	5		5		—		—
Derivatives:
Interest rate contracts	17		—		17		—
Foreign exchange contracts	193		—		193		—
Liabilities:
Derivatives:
Foreign exchange contracts	251		—		251		—

  ______________________________________________

(1)  Includes $2,108 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

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

The fair value of all long-term debt instruments is classified as Level 2. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,352	$	3,583	$	3,713	$	4,162

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Acquisitions and Dispositions (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 business	Sep. 30, 2012 business
Risk Solutions [Member]
Dispositions
Number of dispositions	5	2
Gain (loss) recognized on sale	$ 0.2
HR Solutions [Member]
Dispositions
Number of dispositions		1
Gain (loss) recognized on sale		$ 1.0

XML

Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	$ (2,610)
Other comprehensive income (loss) before reclassifications, net	(94)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	100
Tax benefit	(32)
Amounts reclassified from accumulated other comprehensive loss, net	68
Net current period other comprehensive (loss) income	(26)
Balance at September 30, 2013	(2,636)
Change in Fair Value of Investments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	0	[1]
Other comprehensive income (loss) before reclassifications, net	12	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	(20)	[1]
Tax benefit	7	[1]
Amounts reclassified from accumulated other comprehensive loss, net	(13)	[1]
Net current period other comprehensive (loss) income	(1)	[1]
Balance at September 30, 2013	(1)	[1]
Change in Fair Value of Derivatives [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	(28)	[1]
Other comprehensive income (loss) before reclassifications, net	(24)	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	20	[1]
Tax benefit	(8)	[1]
Amounts reclassified from accumulated other comprehensive loss, net	12	[1]
Net current period other comprehensive (loss) income	(12)	[1]
Balance at September 30, 2013	(40)	[1]
Foreign Currency Translation Adjustments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	233
Other comprehensive income (loss) before reclassifications, net	(78)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	0
Tax benefit	0
Amounts reclassified from accumulated other comprehensive loss, net	0
Net current period other comprehensive (loss) income	(78)
Balance at September 30, 2013	155
Post-Retirement Benefit Obligation [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012	(2,815)	[2]
Other comprehensive income (loss) before reclassifications, net	(4)	[2]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	100	[2]
Tax benefit	(31)	[2]
Amounts reclassified from accumulated other comprehensive loss, net	69	[2]
Net current period other comprehensive (loss) income	65	[2]
Balance at September 30, 2013	$ (2,750)	[2]

[1] Reclassifications from Accumulated other comprehensive loss are recorded in Other income

[2] Reclassifications from Accumulated other comprehensive loss are recorded in Compensation and benefits

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Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost for the pension plans

The following table provides the components of the net periodic benefit cost for Aon’s U.S. pension plans, along with its most significant international pension plans, which are located in the U.K., the Netherlands and Canada (in millions):

	Three months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	5		$	4		$	—		$	—
Interest cost	63			66			28			29
Expected return on plan assets	(89		)	(80		)	(34		)	(31		)
Amortization of net actuarial loss	18			15			13			10
Net periodic (benefit) cost	$	(3	)	$	5		$	7		$	8

	Nine months ended September 30,
	U.K. and Non-U.S.						U.S.
	2013			2012			2013			2012
Service cost	$	14		$	12		$	—		$	—
Interest cost	189			198			84			89
Expected return on plan assets	(267		)	(241		)	(103		)	(95		)
Amortization of net actuarial loss	55			44			39			32
Net periodic (benefit) cost	$	(9	)	$	13		$	20		$	26

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Guarantee of Registered Securities - Condensed Consolidating Statement of Financial Position (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS :
Cash and cash equivalents	$ 369	$ 291	$ 290	$ 272
Short-term investments	357	346
Receivables, net	2,666	3,101
Fiduciary assets	11,698	12,214
Intercompany receivables	0	0
Other current assets	484	430
Total Current Assets	15,574	16,382
Goodwill	8,958	8,943
Intangible assets, net	2,657	2,975
Fixed assets, net	803	820
Investments	139	165
Intercompany receivables	0	0
Other non-current assets	1,174	1,201
Investment in subsidiary	0	0
TOTAL ASSETS	29,305	30,486
CURRENT LIABILITIES
Fiduciary liabilities	11,698	12,214
Short-term debt and current portion of long-term debt	1,206	452
Accounts payable and accrued liabilities	1,523	1,853
Intercompany payables	0	0
Other current liabilities	764	831
Total Current Liabilities	15,191	15,350
Long-term debt	3,352	3,713
Pension, other post-retirement and other post-employment liabilities	1,773	2,276
Intercompany payables	0	0
Other non-current liabilities	1,399	1,342
TOTAL LIABILITIES	21,715	22,681
TOTAL AON SHAREHOLDERS’ EQUITY	7,534	7,762
Noncontrolling interests	56	43
TOTAL EQUITY	7,590	7,805
TOTAL LIABILITIES AND EQUITY	29,305	30,486
Aon plc [Member]
CURRENT ASSETS :
Cash and cash equivalents	118	131	1	0
Short-term investments	0	0
Receivables, net	0	5
Fiduciary assets	0	0
Intercompany receivables	41	0
Other current assets	19	7
Total Current Assets	178	143
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	0	0
Intercompany receivables	7,166	166
Other non-current assets	119	117
Investment in subsidiary	4,306	10,398
TOTAL ASSETS	11,769	10,824
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	361	0
Accounts payable and accrued liabilities	16	10
Intercompany payables	1,308	51
Other current liabilities	1	0
Total Current Liabilities	1,686	61
Long-term debt	443	107
Pension, other post-retirement and other post-employment liabilities	0	0
Intercompany payables	2,100	2,890
Other non-current liabilities	6	4
TOTAL LIABILITIES	4,235	3,062
TOTAL AON SHAREHOLDERS’ EQUITY	7,534	7,762
Noncontrolling interests	0	0
TOTAL EQUITY	7,534	7,762
TOTAL LIABILITIES AND EQUITY	11,769	10,824
Aon Corporation [Member]
CURRENT ASSETS :
Cash and cash equivalents	291	199	58	(21)
Short-term investments	124	89
Receivables, net	5	1
Fiduciary assets	0	0
Intercompany receivables	3,250	2,092
Other current assets	59	53
Total Current Assets	3,729	2,434
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	53	49
Intercompany receivables	2,181	1,997
Other non-current assets	748	735
Investment in subsidiary	11,187	10,208
TOTAL ASSETS	17,898	15,423
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	148	429
Accounts payable and accrued liabilities	41	71
Intercompany payables	4,727	2,637
Other current liabilities	47	49
Total Current Liabilities	4,963	3,186
Long-term debt	2,516	2,515
Pension, other post-retirement and other post-employment liabilities	1,162	1,294
Intercompany payables	7,262	166
Other non-current liabilities	260	254
TOTAL LIABILITIES	16,163	7,415
TOTAL AON SHAREHOLDERS’ EQUITY	1,735	8,008
Noncontrolling interests	0	0
TOTAL EQUITY	1,735	8,008
TOTAL LIABILITIES AND EQUITY	17,898	15,423
Other Non-Guarantor Subsidiaries [Member]
CURRENT ASSETS :
Cash and cash equivalents	0	0	231	293
Short-term investments	233	257
Receivables, net	2,661	3,095
Fiduciary assets	11,698	12,214
Intercompany receivables	6,176	3,545
Other current assets	406	370
Total Current Assets	21,174	19,481
Goodwill	8,958	8,943
Intangible assets, net	2,657	2,975
Fixed assets, net	803	820
Investments	86	116
Intercompany receivables	2,195	2,350
Other non-current assets	408	1,174
Investment in subsidiary	0	0
TOTAL ASSETS	36,281	35,859
CURRENT LIABILITIES
Fiduciary liabilities	11,698	12,214
Short-term debt and current portion of long-term debt	697	23
Accounts payable and accrued liabilities	1,506	1,811
Intercompany payables	3,430	2,162
Other current liabilities	718	779
Total Current Liabilities	18,049	16,989
Long-term debt	393	1,091
Pension, other post-retirement and other post-employment liabilities	611	982
Intercompany payables	2,180	2,247
Other non-current liabilities	1,234	1,909
TOTAL LIABILITIES	22,467	23,218
TOTAL AON SHAREHOLDERS’ EQUITY	13,758	12,598
Noncontrolling interests	56	43
TOTAL EQUITY	13,814	12,641
TOTAL LIABILITIES AND EQUITY	36,281	35,859
Consolidating Adjustments [Member]
CURRENT ASSETS :
Cash and cash equivalents	(40)	(39)	0	0
Short-term investments	0	0
Receivables, net	0	0
Fiduciary assets	0	0
Intercompany receivables	(9,467)	(5,637)
Other current assets	0	0
Total Current Assets	(9,507)	(5,676)
Goodwill	0	0
Intangible assets, net	0	0
Fixed assets, net	0	0
Investments	0	0
Intercompany receivables	(11,542)	(4,513)
Other non-current assets	(101)	(825)
Investment in subsidiary	(15,493)	(20,606)
TOTAL ASSETS	(36,643)	(31,620)
CURRENT LIABILITIES
Fiduciary liabilities	0	0
Short-term debt and current portion of long-term debt	0	0
Accounts payable and accrued liabilities	(40)	(39)
Intercompany payables	(9,465)	(4,850)
Other current liabilities	(2)	3
Total Current Liabilities	(9,507)	(4,886)
Long-term debt	0	0
Pension, other post-retirement and other post-employment liabilities	0	0
Intercompany payables	(11,542)	(5,303)
Other non-current liabilities	(101)	(825)
TOTAL LIABILITIES	(21,150)	(11,014)
TOTAL AON SHAREHOLDERS’ EQUITY	(15,493)	(20,606)
Noncontrolling interests	0	0
TOTAL EQUITY	(15,493)	(20,606)
TOTAL LIABILITIES AND EQUITY	$ (36,643)	$ (31,620)

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Guarantee of Registered Securities Guarantee of Registered Securities - Condensed Consolidating Statement of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net income	$ 264	$ 210	$ 788	$ 713
Less: Net income attributable to noncontrolling interests	8	6	30	25
Net income attributable to Aon shareholders	256	204	758	688
Change in fair value of investments	(14)	0	(1)	0
Change in fair value of derivatives	9	15	(12)	5
Foreign currency translation adjustments	155	164	(77)	71
Post-retirement benefit obligation	24	7	65	46
Total other comprehensive income (loss)	174	186	(25)	122
Equity in other comprehensive loss of subsidiaries, net of tax	0	0	0	0
Less: Other comprehensive income attributable to noncontrolling interests	3	4	1	2
Total other comprehensive income (loss) attributable to Aon shareholders	171	182	(26)	120
Comprehensive income attributable to Aon shareholders	427	386	732	808
Aon plc [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	256	204	758	688
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	256	204	758	688
Change in fair value of investments	0	0	0	0
Change in fair value of derivatives	0	0	0	0
Foreign currency translation adjustments	0	0	0	0
Post-retirement benefit obligation	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Equity in other comprehensive loss of subsidiaries, net of tax	170	182	(27)	120
Less: Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	170	182	(27)	120
Comprehensive income attributable to Aon shareholders	426	386	731	808
Aon Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	108	182	580	582
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	108	182	580	582
Change in fair value of investments	(4)	0	0	0
Change in fair value of derivatives	2	1	5	1
Foreign currency translation adjustments	6	17	(14)	16
Post-retirement benefit obligation	7	9	22	24
Total other comprehensive income (loss)	11	27	13	41
Equity in other comprehensive loss of subsidiaries, net of tax	157	168	(38)	92
Less: Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	168	195	(25)	133
Comprehensive income attributable to Aon shareholders	276	377	555	715
Other Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	272	242	853	756
Less: Net income attributable to noncontrolling interests	8	6	30	25
Net income attributable to Aon shareholders	264	236	823	731
Change in fair value of investments	(10)	0	(1)	0
Change in fair value of derivatives	7	14	(17)	4
Foreign currency translation adjustments	149	147	(63)	55
Post-retirement benefit obligation	17	(2)	43	22
Total other comprehensive income (loss)	163	159	(38)	81
Equity in other comprehensive loss of subsidiaries, net of tax	0	0	0	0
Less: Other comprehensive income attributable to noncontrolling interests	3	4	1	2
Total other comprehensive income (loss) attributable to Aon shareholders	160	155	(39)	79
Comprehensive income attributable to Aon shareholders	424	391	784	810
Consolidating Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	(372)	(418)	(1,403)	(1,313)
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	(372)	(418)	(1,403)	(1,313)
Change in fair value of investments	0	0	0	0
Change in fair value of derivatives	0	0	0	0
Foreign currency translation adjustments	0	0	0	0
Post-retirement benefit obligation	0	0	0	0
Total other comprehensive income (loss)	0	0	0	0
Equity in other comprehensive loss of subsidiaries, net of tax	(327)	(350)	65	(212)
Less: Other comprehensive income attributable to noncontrolling interests	0	0	0	0
Total other comprehensive income (loss) attributable to Aon shareholders	(327)	(350)	65	(212)
Comprehensive income attributable to Aon shareholders	$ (699)	$ (768)	$ (1,338)	$ (1,525)

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Restructuring (Details) (Aon Hewitt Plan [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended			9 Months Ended			12 Months Ended						36 Months Ended
	Oct. 14, 2010	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Sep. 30, 2013 job_elimination
Restructuring and Related Cost
Number of jobs eliminated to date under the plan														2,660
Estimated Total Cost for Restructuring Period	$ 411				$ 411	[1],[2]
Restructuring and related charges		30		32	109		57							364	[1]
Expensed		30	[1]		109	[1]		98	[1]	105	[1]	52	[1]
Restructuring charges reclassified from the HR Solutions segment to the Risk Solutions segment										41
HR Solutions [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period					244	[1]
Restructuring and related charges														224
Expensed		6			57			66		49		52
Risk Solutions [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period					167	[1]
Restructuring and related charges														140
Expensed		24			52			32		56		0
Workforce reduction [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period	261				261	[2]
Restructuring and related charges														237
Expensed		12			50			74		64		49
Workforce reduction [Member] | Minimum [Member]
Restructuring and Related Cost
Number of jobs eliminated to date under the plan	2,900
Real estate lease rationalization [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period	150
Lease consolidation [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period					128	[2]
Restructuring and related charges														106
Expensed		17			53			18		32		3
Asset impairments [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period					15	[2]
Restructuring and related charges														14
Expensed		0			3			4		7		0
Other costs associated with restructuring [Member]
Restructuring and Related Cost
Estimated Total Cost for Restructuring Period					7	[2],[3]
Restructuring and related charges														7	[3]
Expensed		$ 1	[3]		$ 3	[3]		$ 2	[3]	$ 2	[3]	$ 0	[3]

[1] Costs included in the Risk Solutions segment are associated with the transfer of the health and benefits consulting business from HR Solutions to Risk Solutions effective January 1, 2012. Costs incurred in 2011 in the HR Solutions segment of $41 million related to the health and benefits consulting business have been reclassified and presented in the Risk Solutions segment.

[2] Actual costs, when incurred, will vary due to changes in the assumptions built into this 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.

[3] Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

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Other Income (Expense) (Tables)

9 Months Ended

Sep. 30, 2013

Other (Expense) Income [Abstract]

Other Income (Expense)

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

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Equity earnings	$	6		$	—		$	12		$	8
Gains on investments	37			9			36			11
Foreign currency remeasurement (losses) gains	(4		)	(24		)	15			(24		)
Derivative gains (losses)	1			8			(8		)	8
Other	(1		)	(2		)	(1		)	—
	$	39		$	(9	)	$	54		$	3

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Condensed Consolidated Statement of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Ordinary Shares and Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]	Non-controlling Interests [Member]
Beginning Balance at Dec. 31, 2012	$ 7,805	$ 4,439	$ 5,933	$ (2,610)	$ 43
Beginning Balance (in shares) at Dec. 31, 2012	310.9	310.9
Increase (Decrease) in Shareholders' Equity
Net income	788		758		30
Shares issued - employee benefit plans (in shares)		0.7
Shares issued - employee benefit plans	29	29
Shares issued - employee compensation (in shares)		5.2
Shares issued - employee compensation	(49)	(49)
Shares purchased (in shares)		(15.8)
Shares purchased	(1,025)		(1,025)
Tax benefit - employee benefit plans	42	42
Share-based compensation expense	207	207
Dividends to shareholders	(159)		(159)
Net change in fair value of investments	(1)			(1)
Net change in fair value of derivatives	(12)			(12)
Net foreign currency translation adjustments	(77)			(78)	1
Net post-retirement benefit obligation	65			65
Purchase of subsidiary shares from non-controlling interests	(11)	(5)			(6)
Dividends paid to non-controlling interests on subsidiary common stock	(12)				(12)
Ending Balance at Sep. 30, 2013	$ 7,590	$ 4,663	$ 5,507	$ (2,636)	$ 56
Ending Balance (in shares) at Sep. 30, 2013	301.0	301.0

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Basis of Presentation

9 Months Ended

Sep. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements and Notes thereto have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).  The Condensed Consolidated Financial Statements include the accounts of Aon plc and all controlled subsidiaries (“Aon” or the “Company”).  All material intercompany accounts and transactions have been eliminated.  The Condensed Consolidated 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 footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.  These Condensed Consolidated 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, 2012.  The results for the three and nine months endedSeptember 30, 2013 are not necessarily indicative of operating results that may be expected for the full year ending December 31, 2013.

Use of Estimates

The preparation of the accompanying unaudited Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, 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, which management believes to be reasonable under the circumstances.  Aon adjusts such estimates and assumptions when facts and circumstances dictate.  Illiquid credit markets, volatile equity markets, and foreign currency 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 will be reflected in the financial statements in future periods.

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Other Income (Expense)

9 Months Ended

Sep. 30, 2013

Other (Expense) Income [Abstract]

Other Income (Expense)

Other Income (Expense)

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

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Equity earnings	$	6		$	—		$	12		$	8
Gains on investments	37			9			36			11
Foreign currency remeasurement (losses) gains	(4		)	(24		)	15			(24		)
Derivative gains (losses)	1			8			(8		)	8
Other	(1		)	(2		)	(1		)	—
	$	39		$	(9	)	$	54		$	3

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Accounting Principles and Practices

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Accounting Principles and Practices

Accounting Principles and Practices

Changes in Accounting Principles

Accumulated Other Comprehensive Income

In February 2013, the Financial Accounting Standards Board ("FASB") issued guidance on the disclosure of amounts to be reclassified out of accumulated other comprehensive income. The guidance requires that amounts reclassified out of accumulated other comprehensive income be presented either on the face of the statement of operations or in the notes to the financial statements by component. The guidance was effective for Aon beginning in the first quarter 2013. The adoption of this guidance did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Indefinite-Lived Intangible Asset Impairment

In July 2012, the FASB issued guidance on the testing of indefinite-lived intangible assets for impairment that gives an entity the option to perform a qualitative assessment that may eliminate the requirement to perform the annual quantitative test.  The guidance gives an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a an indefinite-lived intangible asset is less than its carrying amount.  If an entity concludes that this is the case, it must perform the quantitative test.  The guidance was effective for Aon beginning in the first quarter 2013.  The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Balance Sheet Offsetting

In December 2011, the FASB issued guidance on the disclosure of offsetting assets and liabilities to enable users of financial statements to evaluate the effect or potential effect of netting arrangements on an entity's financial position. The objective of this disclosure is to facilitate comparison between those entities that prepare their financial statements on the basis of U.S. GAAP and those entities that prepare their financial statements on the basis of IFRS. The guidance requires certain derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and lending transactions to disclose both the gross and net position of these financial instruments. The guidance was effective for Aon beginning in the first quarter 2013.  The adoption of this guidance did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

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Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Changes in the net carrying amount of goodwill by operating segment (in millions)
Balance as of December 31, 2012	$ 8,943
Goodwill related to current year acquisitions	26
Goodwill related to disposals	(3)
Goodwill related to prior year acquisitions	15
Foreign currency translation	(23)
Balance as of September 30, 2013	8,958
Risk Solutions [Member]
Changes in the net carrying amount of goodwill by operating segment (in millions)
Balance as of December 31, 2012	5,982
Goodwill related to current year acquisitions	24
Goodwill related to disposals	(3)
Goodwill related to prior year acquisitions	(2)
Foreign currency translation	(19)
Balance as of September 30, 2013	5,982
HR Solutions [Member]
Changes in the net carrying amount of goodwill by operating segment (in millions)
Balance as of December 31, 2012	2,961
Goodwill related to current year acquisitions	2
Goodwill related to disposals	0
Goodwill related to prior year acquisitions	17
Foreign currency translation	(4)
Balance as of September 30, 2013	$ 2,976

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Restructuring (Tables)

9 Months Ended

Sep. 30, 2013

Restructuring and Related Cost

Schedule of changes in company's liabilities for its restructuring plans

As of September 30, 2013, the Company’s liabilities for its restructuring plans are as follows (in millions):

	Aon Hewitt Plan			Aon Benfield Plan			2007 Plan			Other			Total
Balance at December 31, 2012	$	96		$	3		$	35		$	3		$	137
Expensed	106			—			—			—			106
Cash payments	(91		)	(1		)	(20		)	(1		)	(113		)
Foreign exchange translation and other	7			—			6			—			13
Balance at September 30, 2013 (1)	$	118		$	2		$	21		$	2		$	143

  ______________________________________________

(1) Included within Accounts payable and accrued liabilities and Other non-current liabilities

Aon Hewitt Plan [Member]

Restructuring and Related Cost

Schedule of restructuring and related expenses by type

The following table summarizes restructuring and related costs by type that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
Workforce reduction	$	49	$	64	$	74	$	12	$	50	$	237	$	261
Lease consolidation	3		32		18		17		53		106		128
Asset impairments	—		7		4		—		3		14		15
Other costs associated with restructuring (2)	—		2		2		1		3		7		7
Total restructuring expenses	$	52	$	105	$	98	$	30	$	109	$	364	$	411

 ______________________________________________

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this 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.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

Aon Hewitt Plan [Member] | Total operating segments [Member]

Restructuring and Related Cost

Schedule of restructuring and related expenses by type

The following table summarizes the restructuring and related expenses, by segment, that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
HR Solutions	$	52	$	49	$	66	$	6	57		$	224	$	244
Risk Solutions	—		56		32		24		52		140		167
Total restructuring expenses (1)	$	52	$	105	$	98	$	30	$	109	$	364	$	411

______________________________________________

(1) Costs included in the Risk Solutions segment are associated with the transfer of the health and benefits consulting business from HR Solutions to Risk Solutions effective January 1, 2012. Costs incurred in 2011 in the HR Solutions segment of $41 million related to the health and benefits consulting business have been reclassified and presented in the Risk Solutions segment.

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Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [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,
	2013		2012		2013		2012
Restricted stock units (“RSUs”)	$	40	$	37	$	135	$	120
Performance share awards (“PSAs”)	28		15		66		30
Stock options	—		1		1		4
Employee stock purchase plans	2		2		5		6
Total stock-based compensation expense	$	70	$	55	$	207	$	160

Restricted share unit activity

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	10,432		$	44	9,916		$	42
Granted	3,598		62		4,888		46
Vested	(3,618	)	44		(3,343	)	42
Forfeited	(308	)	47		(516	)	44
Non-vested at end of period	10,104		51		10,945		44

 ______________________________________________

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

Performance-based plans

Information as of September 30, 2013 regarding 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, 2013 and the years ended December 31, 2012 and 2011, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of September 30, 2013		As of December 31, 2012		As of December 31, 2011
Target PSAs granted	1,135		1,369		1,715
Fair value (1)	$	58	$	47	$	50
Number of shares that would be issued based on current performance levels	1,135		2,232		1,386
Unamortized expense, based on current performance levels	$	53	$	46	$	5

 ______________________________________________

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

Share options and related information

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	5,611		$	32	9,116		$	32
Granted	—				—		—
Exercised	(1,694	)	32		(2,570	)	31
Forfeited and expired	(29	)	34		(67	)	37
Outstanding at end of period	3,888		32		6,479		32
Exercisable at end of period	3,681		32		5,969		31

Other information related to the company's share options

Other information related to the Company’s share options is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Aggregate intrinsic value of stock options exercised	$	14	$	23	$	53	$	47
Cash received from the exercise of stock options	14		29		55		80
Tax benefit realized from the exercise of stock options	3		5		10		8

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Cash and Cash Equivalents (Details) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 GBP (£)	Dec. 31, 2012 USD ($)
Cash, Cash Equivalents, and Short-term Investments [Abstract]
Short-term investment, minimum maturity period	3 months	3 months
Short-term investment, maximum maturity period	1 year	1 year
Operating funds in U.K.	$ 124	£ 77	$ 124
Cash and cash equivalents, restricted	$ 88		$ 76

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Derivatives and Hedging (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Derivatives, Fair Value
Notional Amount	$ 1,595		$ 1,849
Derivative Assets	65		210
Derivative Liabilities	113		251
Gross Amounts Offset in the Statement of Financial Position	(26)		(160)
Net Amounts of Assets Presented in the Statement of Financial Position	39	[1]	50	[1]
Gross Amounts Offset in the Statement of Financial Position	(26)		(160)
Net Amounts of Liabilities Presented in the Statement of Financial Position	87	[2]	91	[2]
Derivatives accounted for as hedges [Member]
Derivatives, Fair Value
Notional Amount	1,328		1,544
Derivative Assets	64		208
Derivative Liabilities	112		250
Gross Amounts Offset in the Statement of Financial Position	(25)		(160)
Net Amounts of Assets Presented in the Statement of Financial Position	39	[1]	48	[1]
Gross Amounts Offset in the Statement of Financial Position	(25)		(160)
Net Amounts of Liabilities Presented in the Statement of Financial Position	87	[2]	90	[2]
Interest rate contracts [Member] | Derivatives accounted for as hedges [Member]
Derivatives, Fair Value
Notional Amount	169		336
Derivative Assets	8		17
Derivative Liabilities	0		0
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Assets Presented in the Statement of Financial Position	8	[1]	17	[1]
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	0	[2]	0	[2]
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member]
Derivatives, Fair Value
Notional Amount	1,159		1,208
Derivative Assets	56		191
Derivative Liabilities	112		250
Gross Amounts Offset in the Statement of Financial Position	(25)		(160)
Net Amounts of Assets Presented in the Statement of Financial Position	31	[1]	31	[1]
Gross Amounts Offset in the Statement of Financial Position	(25)		(160)
Net Amounts of Liabilities Presented in the Statement of Financial Position	87	[2]	90	[2]
Foreign exchange contracts [Member] | Derivatives not accounted for as hedges [Member]
Derivatives, Fair Value
Notional Amount	267		305
Derivative Assets	1		2
Derivative Liabilities	1		1
Gross Amounts Offset in the Statement of Financial Position	(1)		0
Net Amounts of Assets Presented in the Statement of Financial Position	0	[1]	2	[1]
Gross Amounts Offset in the Statement of Financial Position	(1)		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	$ 0	[2]	$ 1	[2]

[1] Included within Other current assets or Other non-current assets

[2] Included within Other current liabilities or Other non-current liabilities

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Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
U.K. and Non-U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure
Service cost	$ 5	$ 4	$ 14	$ 12
Interest cost	63	66	189	198
Expected return on plan assets	(89)	(80)	(267)	(241)
Amortization of net actuarial loss	18	15	55	44
Net periodic (benefit) cost	(3)	5	(9)	13
Estimate of contributions to defined benefit pension plans for the current fiscal year	381		381
Contributions made to defined benefit pension plans	59		290
U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure
Service cost	0	0	0	0
Interest cost	28	29	84	89
Expected return on plan assets	(34)	(31)	(103)	(95)
Amortization of net actuarial loss	13	10	39	32
Net periodic (benefit) cost	7	8	20	26
Estimate of contributions to defined benefit pension plans for the current fiscal year	167		167
Contributions made to defined benefit pension plans	$ 54		$ 122

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Investments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
Interest-bearing Assets
Cash and cash equivalents	$ 369		$ 291		$ 290	$ 272
Short-term investments	357		346
Fiduciary assets	4,335	[1]	4,029	[1]
Investments	139		165
Total interest-bearing assets	5,200		4,831
Investments:
Equity method investments	113		102
Other investments	17	[2]	43	[2]
Fixed-maturity securities	9	[3]	20	[3]
Investments	$ 139		$ 165

[1] Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

[2] The reduction in other investments is due to the sale of certain equity securities

[3] The reduction in fixed-maturity securities is due to the repayment in full of a security

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 264	$ 210	$ 788	$ 713
Less: Net income attributable to noncontrolling interests	8	6	30	25
Net income attributable to Aon shareholders	256	204	758	688
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	(14)	0	(1)	0
Change in fair value of derivatives	9	15	(12)	5
Foreign currency translation adjustments	155	164	(77)	71
Post-retirement benefit obligation	24	7	65	46
Total other comprehensive income (loss)	174	186	(25)	122
Less: Other comprehensive income attributable to noncontrolling interests	3	4	1	2
Total other comprehensive income (loss) attributable to Aon shareholders	171	182	(26)	120
Comprehensive income attributable to Aon shareholders	$ 427	$ 386	$ 732	$ 808

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Restructuring

9 Months Ended

Sep. 30, 2013

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

Aon Hewitt Restructuring Plan

On October 14, 2010, Aon announced a global restructuring plan (“Aon Hewitt Plan”) in connection with the acquisition of Hewitt Associates, Inc. ("Hewitt").  The Aon Hewitt Plan is intended to streamline operations across the combined Aon Hewitt organization, the Health & Benefits organization and shared services and facility rationalization across the Company. The Aon Hewitt Plan includes approximately 2,900 job eliminations. The Company expects these restructuring activities and related expenses to affect operations through the end of 2013.  The Aon Hewitt Plan is expected to result in cumulative costs of approximately $411 million through the end of the plan, consisting of approximately $261 million in employee termination costs and approximately $150 million in real estate rationalization costs across the Company.

From the inception of the Aon Hewitt Plan through September 30, 2013, approximately 2,660 jobs have been eliminated and total expenses of $364 million have been incurred.  The Company recorded $30 million and $109 million of restructuring and related charges in the three and nine months endedSeptember 30, 2013, respectively. The Company recorded $32 million and $57 million of restructuring and related charges in the three and nine months endedSeptember 30, 2012, respectively. Charges related to the restructuring are included in Compensation and benefits and Other general expenses in the accompanying Condensed Consolidated Statements of Income.

The following table summarizes restructuring and related costs by type that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
Workforce reduction	$	49	$	64	$	74	$	12	$	50	$	237	$	261
Lease consolidation	3		32		18		17		53		106		128
Asset impairments	—		7		4		—		3		14		15
Other costs associated with restructuring (2)	—		2		2		1		3		7		7
Total restructuring expenses	$	52	$	105	$	98	$	30	$	109	$	364	$	411

 ______________________________________________

(1) Actual costs, when incurred, will vary due to changes in the assumptions built into this 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.

(2) Other costs associated with restructuring initiatives, including moving costs and consulting and legal fees, are recognized when incurred.

The following table summarizes the restructuring and related expenses, by segment, that have been incurred and are estimated to be incurred through the end of the restructuring initiative related to the Aon Hewitt Plan (in millions):

	2010		2011		2012		Third Quarter 2013		Nine Months 2013		Total to Date		Estimated Total Cost for Restructuring Plan (1)
HR Solutions	$	52	$	49	$	66	$	6	57		$	224	$	244
Risk Solutions	—		56		32		24		52		140		167
Total restructuring expenses (1)	$	52	$	105	$	98	$	30	$	109	$	364	$	411

______________________________________________

(1) Costs included in the Risk Solutions segment are associated with the transfer of the health and benefits consulting business from HR Solutions to Risk Solutions effective January 1, 2012. Costs incurred in 2011 in the HR Solutions segment of $41 million related to the health and benefits consulting business have been reclassified and presented in the Risk Solutions segment.

As of September 30, 2013, the Company’s liabilities for its restructuring plans are as follows (in millions):

	Aon Hewitt Plan			Aon Benfield Plan			2007 Plan			Other			Total
Balance at December 31, 2012	$	96		$	3		$	35		$	3		$	137
Expensed	106			—			—			—			106
Cash payments	(91		)	(1		)	(20		)	(1		)	(113		)
Foreign exchange translation and other	7			—			6			—			13
Balance at September 30, 2013 (1)	$	118		$	2		$	21		$	2		$	143

  ______________________________________________

(1) Included within Accounts payable and accrued liabilities and Other non-current liabilities

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Condensed Consolidated Statements of Financial Position (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common stock, nominal or par value	$ 0.01	$ 0.01
Common stock, Authorized shares	750	750
Common stock, issued shares	301.0	310.9

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Fair Value and Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Unrealized gain	$ 0	$ 0	$ 0	$ 0
Realized gain (loss)	6	0	6	0
Fair value of financial instrument
Carrying value of total debt	3,352		3,352		3,713
Fair value of total debt	$ 3,583		$ 3,583		$ 4,162

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Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Revenue
Commissions, fees and other	$ 2,786		$ 2,726		$ 8,585		$ 8,368
Fiduciary investment income	8		11		21		31
Total revenue	2,794		2,737		8,606		8,399
Expenses
Compensation and benefits	1,666		1,620		5,103		4,920
Other general expenses	764		778		2,347		2,344
Total operating expenses	2,430		2,398		7,450		7,264
Operating income	364		339		1,156		1,135
Interest income	3		1		6		6
Interest expense	(53)		(57)		(153)		(173)
Other income (expense)	39		(9)		54		3
Income from continuing operations before income taxes	353		274		1,063		971
Income taxes	89		64		275		257
Income from continuing operations	264		210		788		714
Loss from discontinued operations before income taxes	0		0		0		(1)
Income taxes	0		0		0		0
Loss from discontinued operations	0		0		0		(1)
Net income	264		210		788		713
Less: Net income attributable to noncontrolling interests	8		6		30		25
Net income attributable to Aon shareholders	256		204		758		688
Net income (loss) attributable to Aon shareholders
Income from continuing operations	256		204		758		689
Loss from discontinued operations	0		0		0		(1)
Net income attributable to Aon shareholders	$ 256		$ 204		$ 758		$ 688
Basic net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	$ 0.83		$ 0.62		$ 2.42		$ 2.08
Discontinued operations (in dollars per share)	$ 0.00		$ 0.00		$ 0.00		$ 0.00
Net income (in dollars per share)	$ 0.83		$ 0.62		$ 2.42		$ 2.08
Diluted net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	$ 0.82		$ 0.62		$ 2.39		$ 2.06
Discontinued operations (in dollars per share)	$ 0.00		$ 0.00		$ 0.00		$ 0.00
Net income (in dollars per share)	$ 0.82		$ 0.62		$ 2.39		$ 2.06
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.18		$ 0.16		$ 0.51		$ 0.46
Weighted average ordinary shares outstanding - basic	309.5	[1]	327.3	[1]	313.2	[1]	330.6	[1]
Weighted average ordinary shares outstanding - diluted	312.9		331.0		316.7		334.4

[1] Includes 3.8 million and 4.5 million of participating securities for the three months ended September 30, 2013 and 2012, respectively, and 4.0 million and 4.7 million of participating securities for the nine months ended September 30, 2013 and 2012, respectively.

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Share-Based Compensation Plans (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012		Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 70		$ 55		$ 207		$ 160
Restricted stock units (“RSUs”) [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	40		37		135		120
Non-vested share awards
Non-vested at beginning of period (in shares)					10,432		9,916		9,916
Granted (in shares)					3,598		4,888
Vested (in shares)					(3,618)		(3,343)
Forfeited (in shares)					(308)		(516)
Non-vested at end of period (in shares)	10,104		10,945		10,104		10,945
Weighted Average Fair value
Non-vested at beginning of period (in dollars per share)					$ 44	[1]	$ 42	[1]	$ 42	[1]
Granted (in dollars per share)					$ 62	[1]	$ 46	[1]
Vested (in dollars per share)					$ 44	[1]	$ 42	[1]
Forfeited (in dollars per share)					$ 47	[1]	$ 44	[1]
Non-vested at end of period (in dollars per share)	$ 51	[1]	$ 44	[1]	$ 51	[1]	$ 44	[1]
Target PSAs granted					3,598		4,888
Fair value					$ 62	[1]	$ 46	[1]
Performance share awards (“PSAs”) [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	28		15		66		30
Non-vested share awards
Granted (in shares)					1,135				1,369		1,715
Weighted Average Fair value
Granted (in dollars per share)					$ 58	[2]			$ 47	[2]	$ 50	[2]
Target PSAs granted					1,135				1,369		1,715
Fair value					$ 58	[2]			$ 47	[2]	$ 50	[2]
Number of shares that would be issued based on current performance levels					1,135				2,232		1,386
Unamortized expense, based on current performance levels	53				53				46		5
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	0		1		1		4
Employee stock purchase plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation expense	$ 2		$ 2		$ 5		$ 6
Minimum [Member] | Performance share awards (“PSAs”) [Member]
Weighted Average Fair value
Vesting conditions period					1 year
Percent of shares issued	0.00%				0.00%
Maximum [Member] | Performance share awards (“PSAs”) [Member]
Weighted Average Fair value
Vesting conditions period					5 years
Percent of shares issued	200.00%				200.00%

[1] Represents per share weighted average fair value of award at date of grant

[2] Represents per share weighted average fair value of award at date of grant.

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Investments (Tables)

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Schedule of interest bearing assets

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	September 30, 2013		December 31, 2012
Cash and cash equivalents	$	369	$	291
Short-term investments	357		346
Fiduciary assets (1)	4,335		4,029
Investments	139		165
	$	5,200	$	4,831

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

Schedule of investments

The Company’s investments are as follows (in millions):

	September 30, 2013		December 31, 2012
Equity method investments	$	113	$	102
Other investments (2)	17		43
Fixed-maturity securities (3)	9		20
	$	139	$	165

  ______________________________________________

(2) The reduction in other investments is due to the sale of certain equity securities.

(3) The reduction in fixed-maturity securities is due to the repayment in full of a security.

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Segment Information

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has two reportable segments:  Risk Solutions and HR Solutions.  Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Condensed Consolidated Financial Statements.

Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon’s chief operating decision-maker (“CODM”) uses financial information for the purposes of allocating resources and evaluating performance.  The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices.  The Company does not present net assets by segment as this information is not reviewed by the CODM.

Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon’s global distribution network.

HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Aon’s total revenue is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	1,821		$	1,778		$	5,736		$	5,582
HR Solutions	981			971			2,891			2,847
Intersegment elimination	(8		)	(12		)	(21		)	(30		)
Total revenue	$	2,794		$	2,737		$	8,606		$	8,399

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Retail brokerage	$	1,424		$	1,390		$	4,548		$	4,395
Reinsurance brokerage	389			377			1,167			1,156
Total Risk Solutions Segment	1,813			1,767			5,715			5,551
Consulting services	406			394			1,176			1,140
Outsourcing	587			585			1,746			1,723
Intrasegment	(12		)	(8		)	(31		)	(16		)
Total HR Solutions Segment	981			971			2,891			2,847
Intersegment	(8		)	(12		)	(21		)	(30		)
Total commissions, fees and other revenue	$	2,786		$	2,726		$	8,585		$	8,368

Fiduciary investment income by segment is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Risk Solutions	$	8	$	11	$	21	$	31
HR Solutions	—		—		—		—
Total fiduciary investment income	$	8	$	11	$	21	$	31

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	333		$	309		$	1,127		$	1,059
HR Solutions	75			80			162			211
Segment income before income taxes	408			389			1,289			1,270
Unallocated expenses	(44		)	(50		)	(133		)	(135		)
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other income (expense)	39			(9		)	54			3
Income before income taxes	$	353		$	274		$	1,063		$	971

Unallocated expenses include administrative or other costs not attributable to the operating segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of worldwide debt obligations.

Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency transactions.

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Restructuring (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Restructuring Reserve
Balance at December 31, 2012	$ 137
Expensed	106
Cash payments	(113)
Foreign exchange translation and other	13
Balance at September 30, 2013 (1)	143	[1]
Aon Hewitt Plan [Member]
Restructuring Reserve
Balance at December 31, 2012	96
Expensed	106
Cash payments	(91)
Foreign exchange translation and other	7
Balance at September 30, 2013 (1)	118	[1]
Aon Benfield Plan [Member]
Restructuring Reserve
Balance at December 31, 2012	3
Expensed	0
Cash payments	(1)
Foreign exchange translation and other	0
Balance at September 30, 2013 (1)	2	[1]
2007 Plan [Member]
Restructuring Reserve
Balance at December 31, 2012	35
Expensed	0
Cash payments	(20)
Foreign exchange translation and other	6
Balance at September 30, 2013 (1)	21	[1]
Other [Member]
Restructuring Reserve
Balance at December 31, 2012	3
Expensed	0
Cash payments	(1)
Foreign exchange translation and other	0
Balance at September 30, 2013 (1)	$ 2	[1]

[1] Included within Accounts payable and accrued liabilities and Other non-current liabilities

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Derivatives and Hedging (Details)	9 Months Ended
	Sep. 30, 2013
Cash flow hedges [Member]
Foreign Exchange Risk Management
Foreign currency exposures, maximum average hedging period	2 years
Foreign currency exposures, maximum hedging period	5 years
Interest Rate Risk Management
Interest rate fluctuations, maximum hedging period	2 years
Net investment hedges [Member]
Foreign Exchange Risk Management
Foreign currency exposures, maximum hedging period	2 years
Not designated as hedging instrument [Member]
Foreign Exchange Risk Management
Foreign currency exposures, maximum hedging period	1 year

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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$ 984	$ 867
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	81	171
Purchases of long-term investments	(13)	(9)
Net (purchases) sales of short-term investments - non-fiduciary	(13)	66
Acquisition of businesses, net of cash acquired	(26)	(97)
Proceeds from sale of businesses	6	2
Capital expenditures	(174)	(201)
CASH USED FOR INVESTING ACTIVITIES	(139)	(68)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025)	(625)
Advances from (to) affiliates	0	0
Issuance of shares for employee benefit plans	84	93
Issuance of debt	4,270	333
Repayment of debt	(3,870)	(427)
Cash dividends to shareholders	(159)	(153)
Purchase of shares from noncontrolling interests	(6)	0
Dividends paid to noncontrolling interests	(13)	(17)
CASH USED FOR FINANCING ACTIVITIES	(719)	(796)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(48)	15
NET INCREASE IN CASH AND CASH EQUIVALENTS	78	18
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	291	272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	369	290
Aon plc [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(14)	(46)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	0	0
Purchases of long-term investments	0	0
Net (purchases) sales of short-term investments - non-fiduciary	0	(16)
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH USED FOR INVESTING ACTIVITIES	0	(16)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025)	(525)
Advances from (to) affiliates	405	648
Issuance of shares for employee benefit plans	84	44
Issuance of debt	1,145	0
Repayment of debt	(449)	0
Cash dividends to shareholders	(159)	(104)
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0	0
CASH USED FOR FINANCING ACTIVITIES	1	63
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	(13)	1
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	131	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	118	1
Aon Corporation [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	(195)	(189)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	8	79
Purchases of long-term investments	(13)	(9)
Net (purchases) sales of short-term investments - non-fiduciary	(35)	61
Acquisition of businesses, net of cash acquired	0	(55)
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH USED FOR INVESTING ACTIVITIES	(40)	76
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	(100)
Advances from (to) affiliates	610	376
Issuance of shares for employee benefit plans	0	49
Issuance of debt	2,894	332
Repayment of debt	(3,177)	(416)
Cash dividends to shareholders	0	(49)
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0	0
CASH USED FOR FINANCING ACTIVITIES	327	192
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	92	79
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	199	(21)
CASH AND CASH EQUIVALENTS AT END OF PERIOD	291	58
Other Non-Guarantor Subsidiaries [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	1,193	1,102
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	73	92
Purchases of long-term investments	0	0
Net (purchases) sales of short-term investments - non-fiduciary	22	21
Acquisition of businesses, net of cash acquired	(26)	(42)
Proceeds from sale of businesses	6	2
Capital expenditures	(174)	(201)
CASH USED FOR INVESTING ACTIVITIES	(99)	(128)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	(1,014)	(1,024)
Issuance of shares for employee benefit plans	0	0
Issuance of debt	231	1
Repayment of debt	(244)	(11)
Cash dividends to shareholders	0	0
Purchase of shares from noncontrolling interests	(6)	0
Dividends paid to noncontrolling interests	(13)	(17)
CASH USED FOR FINANCING ACTIVITIES	(1,046)	(1,051)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(48)	15
NET INCREASE IN CASH AND CASH EQUIVALENTS	0	(62)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	293
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0	231
Consolidating Adjustments [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	0	0
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	0	0
Purchases of long-term investments	0	0
Net (purchases) sales of short-term investments - non-fiduciary	0	0
Acquisition of businesses, net of cash acquired	0	0
Proceeds from sale of businesses	0	0
Capital expenditures	0	0
CASH USED FOR INVESTING ACTIVITIES	0	0
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	0	0
Advances from (to) affiliates	(1)	0
Issuance of shares for employee benefit plans	0	0
Issuance of debt	0	0
Repayment of debt	0	0
Cash dividends to shareholders	0	0
Purchase of shares from noncontrolling interests	0	0
Dividends paid to noncontrolling interests	0	0
CASH USED FOR FINANCING ACTIVITIES	(1)	0
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	0	0
NET INCREASE IN CASH AND CASH EQUIVALENTS	(1)	0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	(39)	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ (40)	$ 0

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Acquisitions and Dispositions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 business	Sep. 30, 2012 business	Dec. 31, 2012
Intangible assets:
Goodwill	$ 8,958		$ 8,943
HR Solutions [Member]
Business Acquisition
Number of business acquired under business combination	2	2
Intangible assets:
Goodwill	2,976		2,961
Risk Solutions [Member]
Business Acquisition
Number of business acquired under business combination	5	4
Intangible assets:
Goodwill	5,982		5,982
Business Acquisition 1 [Member]
Business Acquisition
Consideration	26	110
Intangible assets:
Goodwill	26	60
Other intangible assets	8	56
Total	$ 34	$ 116

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Schedule of total revenue by business segments

Aon’s total revenue is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	1,821		$	1,778		$	5,736		$	5,582
HR Solutions	981			971			2,891			2,847
Intersegment elimination	(8		)	(12		)	(21		)	(30		)
Total revenue	$	2,794		$	2,737		$	8,606		$	8,399

Schedule of commissions, fees and other revenues by products

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Retail brokerage	$	1,424		$	1,390		$	4,548		$	4,395
Reinsurance brokerage	389			377			1,167			1,156
Total Risk Solutions Segment	1,813			1,767			5,715			5,551
Consulting services	406			394			1,176			1,140
Outsourcing	587			585			1,746			1,723
Intrasegment	(12		)	(8		)	(31		)	(16		)
Total HR Solutions Segment	981			971			2,891			2,847
Intersegment	(8		)	(12		)	(21		)	(30		)
Total commissions, fees and other revenue	$	2,786		$	2,726		$	8,585		$	8,368

Schedule of fiduciary investment income by business segments

Fiduciary investment income by segment is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Risk Solutions	$	8	$	11	$	21	$	31
HR Solutions	—		—		—		—
Total fiduciary investment income	$	8	$	11	$	21	$	31

Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Risk Solutions	$	333		$	309		$	1,127		$	1,059
HR Solutions	75			80			162			211
Segment income before income taxes	408			389			1,289			1,270
Unallocated expenses	(44		)	(50		)	(133		)	(135		)
Interest income	3			1			6			6
Interest expense	(53		)	(57		)	(153		)	(173		)
Other income (expense)	39			(9		)	54			3
Income before income taxes	$	353		$	274		$	1,063		$	971

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Guarantee of Registered Securities (Tables)

9 Months Ended

Sep. 30, 2013

Guarantee of Registered Securities [Abstract]

Condensed Consolidating Statements of Income

Condensed Consolidating Statement of Income

	Three months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	1		$	—		$	2,785		$	—		$	2,786
Fiduciary investment income	—			—			8			—			8
Total revenue	1			—			2,793			—			2,794
Expenses
Compensation and benefits	11			14			1,641			—			1,666
Other general expenses	—			5			759			—			764
Total operating expenses	11			19			2,400			—			2,430
Operating (loss) income	(10		)	(19		)	393			—			364
Interest income	—			1			2			—			3
Interest expense	(6		)	(39		)	(8		)	—			(53		)
Intercompany interest income (expense)	25			11			(36		)	—			—
Other income	—			13			26			—			39
Income (loss) from continuing operations before taxes	9			(33		)	377			—			353
Income tax (benefit) expense	(2		)	(14		)	105			—			89
Income (loss) from continuing operations	11			(19		)	272			—			264
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	245			127			—			(372		)	—
Net income	256			108			272			(372		)	264
Less: Net income attributable to noncontrolling interests	—			—			8			—			8
Net income attributable to Aon shareholders	$	256		$	108		$	264		$	(372	)	$	256

Condensed Consolidating Statement of Income

	Three months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	2,726		$	—		$	2,726
Fiduciary investment income	—			—			11			—			11
Total revenue	—			—			2,737			—			2,737
Expenses
Compensation and benefits	4			(5		)	1,621			—			1,620
Other general expenses	19			6			753			—			778
Total operating expenses	23			1			2,374			—			2,398
Operating (loss) income	(23		)	(1		)	363			—			339
Interest income	—			—			1			—			1
Interest expense	—			(45		)	(12		)	—			(57		)
Intercompany interest (expense) income	(8		)	48			(40		)	—			—
Other income (expense)	—			10			(19		)	—			(9		)
(Loss) income from continuing operations before taxes	(31		)	12			293			—			274
Income tax (benefit) expense	(3		)	16			51			—			64
(Loss) income from continuing operations	(28		)	(4		)	242			—			210
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	232			186			—			(418		)	—
Net income	204			182			242			(418		)	210
Less: Net income attributable to noncontrolling interests	—			—			6			—			6
Net income attributable to Aon shareholders	$	204		$	182		$	236		$	(418	)	$	204

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	2		$	—		$	8,583		$	—		$	8,585
Fiduciary investment income	—			—			21			—			21
Total revenue	2			—			8,604			—			8,606
Expenses
Compensation and benefits	27			34			5,042			—			5,103
Other general expenses	14			29			2,304			—			2,347
Total operating expenses	41			63			7,346			—			7,450
Operating (loss) income	(39		)	(63		)	1,258			—			1,156
Interest income	1			2			3			—			6
Interest expense	(12		)	(106		)	(35		)	—			(153		)
Intercompany interest income (expense)	11			96			(107		)	—			—
Other income	—			10			44			—			54
(Loss) income from continuing operations before taxes	(39		)	(61		)	1,163			—			1,063
Income tax (benefit) expense	(11		)	(24		)	310			—			275
(Loss) income from continuing operations	(28		)	(37		)	853			—			788
Loss from discontinued operations before taxes	—			—			—			—			—
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			—			—			—
Equity in earnings of subsidiaries, net of tax	786			617			—			(1,403		)	—
Net income	758			580			853			(1,403		)	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758

Condensed Consolidating Statement of Income

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Revenue
Commissions, fees and other	$	—		$	—		$	8,368		$	—		$	8,368
Fiduciary investment income	—			1			30			—			31
Total revenue	—			1			8,398			—			8,399
Expenses
Compensation and benefits	—			31			4,889			—			4,920
Other general expenses	20			27			2,297			—			2,344
Total operating expenses	20			58			7,186			—			7,264
Operating (loss) income	(20		)	(57		)	1,212			—			1,135
Interest income	—			1			5			—			6
Interest expense	—			(125		)	(48		)	—			(173		)
Intercompany interest (expense) income	(11		)	141			(130		)	—			—
Other income (expense)	—			13			(10		)	—			3
(Loss) income from continuing operations before taxes	(31		)	(27		)	1,029			—			971
Income tax (benefit) expense	(4		)	(11		)	272			—			257
(Loss) income from continuing operations	(27		)	(16		)	757			—			714
Loss from discontinued operations before taxes	—			—			(1		)	—			(1		)
Income taxes	—			—			—			—			—
Loss from discontinued operations	—			—			(1		)	—			(1		)
Equity in earnings of subsidiaries, net of tax	715			598			—			(1,313		)	—
Net income	688			582			756			(1,313		)	713
Less: Net income attributable to noncontrolling interests	—			—			25			—			25
Net income attributable to Aon shareholders	$	688		$	582		$	731		$	(1,313	)	$	688

Condensed Consolidating Statements of Comprehensive Income

Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2013
						Other
	Aon		Aon			Non-Guarantor			Consolidating
(millions)	plc		Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	256	$	108		$	272		$	(372	)	$	264
Less: Net income attributable to noncontrolling interests	—		—			8			—			8
Net income attributable to Aon shareholders	$	256	$	108		$	264		$	(372	)	$	256
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—		(4		)	(10		)	—			(14		)
Change in fair value of derivatives	—		2			7			—			9
Foreign currency translation adjustments	—		6			149			—			155
Post-retirement benefit obligation	—		7			17			—			24
Total other comprehensive income	—		11			163			—			174
Equity in other comprehensive loss of subsidiaries, net of tax	170		157			—			(327		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—			3			—			3
Total other comprehensive income attributable to Aon shareholders	170		168			160			(327		)	171
Comprehensive income attributable to Aon shareholders	$	426	$	276		$	424		$	(699	)	$	427

Condensed Consolidating Statement of Comprehensive Income

	Three months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor			Consolidating
(millions)	plc		Corporation		Subsidiaries			Adjustments			Consolidated
Net income	$	204	$	182	$	242		$	(418	)	$	210
Less: Net income attributable to noncontrolling interests	—		—		6			—			6
Net income attributable to Aon shareholders	$	204	$	182	$	236		$	(418	)	$	204
Other comprehensive income (loss), net of tax:
Change in fair value of investments	—		—		—			—			—
Change in fair value of derivatives	—		1		14			—			15
Foreign currency translation adjustments	—		17		147			—			164
Post-retirement benefit obligation	—		9		(2		)	—			7
Total other comprehensive income	—		27		159			—			186
Equity in other comprehensive income of subsidiaries, net of tax	182		168		—			(350		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		4			—			4
Total other comprehensive income attributable to Aon shareholders	182		195		155			(350		)	182
Comprehensive income attributable to Aon Shareholders	$	386	$	377	$	391		$	(768	)	$	386

Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2013
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
Net income	$	758		$	580		$	853		$	(1,403	)	$	788
Less: Net income attributable to noncontrolling interests	—			—			30			—			30
Net income attributable to Aon shareholders	$	758		$	580		$	823		$	(1,403	)	$	758
Other comprehensive (loss) income, net of tax:
Change in fair value of investments	—			—			(1		)	—			(1		)
Change in fair value of derivatives	—			5			(17		)	—			(12		)
Foreign currency translation adjustments	—			(14		)	(63		)	—			(77		)
Post-retirement benefit obligation	—			22			43			—			65
Total other comprehensive income (loss)	—			13			(38		)	—			(25		)
Equity in other comprehensive loss of subsidiaries, net of tax	(27		)	(38		)	—			65			—
Less: Other comprehensive income attributable to noncontrolling interests	—			—			1			—			1
Total other comprehensive loss attributable to Aon shareholders	(27		)	(25		)	(39		)	65			(26		)
Comprehensive income attributable to Aon shareholders	$	731		$	555		$	784		$	(1,338	)	$	732

Condensed Consolidating Statement of Comprehensive Income

	Nine months ended September 30, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
Net income	$	688	$	582	$	756	$	(1,313	)	$	713
Less: Net income attributable to noncontrolling interests	—		—		25		—			25
Net income attributable to Aon shareholders	$	688	$	582	$	731	$	(1,313	)	$	688
Other comprehensive income, net of tax:
Change in fair value of investments	—		—		—		—			—
Change in fair value of derivatives	—		1		4		—			5
Foreign currency translation adjustments	—		16		55		—			71
Post-retirement benefit obligation	—		24		22		—			46
Total other comprehensive income	—		41		81		—			122
Equity in other comprehensive income of subsidiaries, net of tax	120		92		—		(212		)	—
Less: Other comprehensive income attributable to noncontrolling interests	—		—		2		—			2
Total other comprehensive income attributable to Aon shareholders	120		133		79		(212		)	120
Comprehensive income attributable to Aon Shareholders	$	808	$	715	$	810	$	(1,525	)	$	808

Condensed Consolidating Statements of Financial Position

Condensed Consolidating Statement of Financial Position

	As of September 30, 2013
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	118	$	291	$	—	$	(40	)	$	369
Short-term investments	—		124		233		—			357
Receivables, net	—		5		2,661		—			2,666
Fiduciary assets	—		—		11,698		—			11,698
Intercompany receivables	41		3,250		6,176		(9,467		)	—
Other current assets	19		59		406		—			484
Total Current Assets	178		3,729		21,174		(9,507		)	15,574
Goodwill	—		—		8,958		—			8,958
Intangible assets, net	—		—		2,657		—			2,657
Fixed assets, net	—		—		803		—			803
Investments	—		53		86		—			139
Intercompany receivables	7,166		2,181		2,195		(11,542		)	—
Other non-current assets	119		748		408		(101		)	1,174
Investment in subsidiary	4,306		11,187		—		(15,493		)	—
TOTAL ASSETS	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	11,698	$	—		$	11,698
Short-term debt and current portion of long-term debt	361		148		697		—			1,206
Accounts payable and accrued liabilities	16		41		1,506		(40		)	1,523
Intercompany payables	1,308		4,727		3,430		(9,465		)	—
Other current liabilities	1		47		718		(2		)	764
Total Current Liabilities	1,686		4,963		18,049		(9,507		)	15,191
Long-term debt	443		2,516		393		—			3,352
Pension, other post-retirement and other post-employment liabilities	—		1,162		611		—			1,773
Intercompany payables	2,100		7,262		2,180		(11,542		)	—
Other non-current liabilities	6		260		1,234		(101		)	1,399
TOTAL LIABILITIES	4,235		16,163		22,467		(21,150		)	21,715
TOTAL AON SHAREHOLDERS’ EQUITY	7,534		1,735		13,758		(15,493		)	7,534
Noncontrolling interests	—		—		56		—			56
TOTAL EQUITY	7,534		1,735		13,814		(15,493		)	7,590
TOTAL LIABILITIES AND EQUITY	$	11,769	$	17,898	$	36,281	$	(36,643	)	$	29,305

Condensed Consolidating Statement of Financial Position

	As of December 31, 2012
					Other
	Aon		Aon		Non-Guarantor		Consolidating
(millions)	plc		Corporation		Subsidiaries		Adjustments			Consolidated
ASSETS
Cash and cash equivalents	$	131	$	199	$	—	$	(39	)	$	291
Short-term investments	—		89		257		—			346
Receivables, net	5		1		3,095		—			3,101
Fiduciary assets	—		—		12,214		—			12,214
Intercompany receivables	—		2,092		3,545		(5,637		)	—
Other current assets	7		53		370		—			430
Total Current Assets	143		2,434		19,481		(5,676		)	16,382
Goodwill	—		—		8,943		—			8,943
Intangible assets, net	—		—		2,975		—			2,975
Fixed assets, net	—		—		820		—			820
Investments	—		49		116		—			165
Intercompany receivables	166		1,997		2,350		(4,513		)	—
Other non-current assets	117		735		1,174		(825		)	1,201
Investment in subsidiary	10,398		10,208		—		(20,606		)	—
TOTAL ASSETS	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486
LIABILITIES AND EQUITY
Fiduciary liabilities	$	—	$	—	$	12,214	$	—		$	12,214
Short-term debt and current portion of long-term debt	—		429		23		—			452
Accounts payable and accrued liabilities	10		71		1,811		(39		)	1,853
Intercompany payables	51		2,637		2,162		(4,850		)	—
Other current liabilities	—		49		779		3			831
Total Current Liabilities	61		3,186		16,989		(4,886		)	15,350
Long-term debt	107		2,515		1,091		—			3,713
Pension, other post-retirement and other post-employment liabilities	—		1,294		982		—			2,276
Intercompany payables	2,890		166		2,247		(5,303		)	—
Other non-current liabilities	4		254		1,909		(825		)	1,342
TOTAL LIABILITIES	3,062		7,415		23,218		(11,014		)	22,681
TOTAL AON SHAREHOLDERS’ EQUITY	7,762		8,008		12,598		(20,606		)	7,762
Noncontrolling interests	—		—		43		—			43
TOTAL EQUITY	7,762		8,008		12,641		(20,606		)	7,805
TOTAL LIABILITIES AND EQUITY	$	10,824	$	15,423	$	35,859	$	(31,620	)	$	30,486

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2013
	Aon			Aon			Other Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments			Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES	$	(14	)	$	(195	)	$	1,193		$	—		$	984
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			8			73			—			81
Purchase of long-term investments	—			(13		)	—			—			(13		)
Net (purchases) sales of short-term investments - non-fiduciary	—			(35		)	22			—			(13		)
Acquisition of businesses, net of cash acquired	—			—			(26		)	—			(26		)
Proceeds from sale of businesses	—			—			6			—			6
Capital expenditures	—			—			(174		)	—			(174		)
CASH USED FOR INVESTING ACTIVITIES	—			(40		)	(99		)	—			(139		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025		)	—			—			—			(1,025		)
Advances from (to) affiliates	405			610			(1,014		)	(1		)	—
Issuance of shares for employee benefit plans	84			—			—			—			84
Issuance of debt	1,145			2,894			231			—			4,270
Repayment of debt	(449		)	(3,177		)	(244		)	—			(3,870		)
Cash dividends to shareholders	(159		)	—			—			—			(159		)
Purchase of shares from noncontrolling interests	—			—			(6		)	—			(6		)
Dividends paid to noncontrolling interests	—			—			(13		)	—			(13		)
CASH (USED FOR) PROVIDED BY FINANCING ACTIVITIES	1			327			(1,046		)	(1		)	(719		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			(48		)	—			(48		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(13		)	92			—			(1		)	78
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	131			199			—			(39		)	291
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	118		$	291		$	—		$	(40	)	$	369

Condensed Consolidating Statement of Cash Flows

	Nine months ended September 30, 2012
							Other
	Aon			Aon			Non-Guarantor			Consolidating
(millions)	plc			Corporation			Subsidiaries			Adjustments		Consolidated
CASH FLOWS FROM OPERATING ACTIVITIES
CASH (USED FOR) PROVIDED BY OPERATING ACTIVITIES	$	(46	)	$	(189	)	$	1,102		$	—	$	867
CASH FLOWS FROM INVESTING ACTIVITIES
Sales of long-term investments	—			79			92			—		171
Purchase of long-term investments	—			(9		)	—			—		(9		)
Net (purchases) sales of short-term investments - non-fiduciary	(16		)	61			21			—		66
Acquisition of businesses, net of cash acquired	—			(55		)	(42		)	—		(97		)
Proceeds from sale of businesses	—			—			2			—		2
Capital expenditures	—			—			(201		)	—		(201		)
CASH (USED FOR) PROVIDED BY INVESTING ACTIVITIES	(16		)	76			(128		)	—		(68		)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(525		)	(100		)	—			—		(625		)
Advances from (to) affiliates	648			376			(1,024		)	—		—
Issuance of shares for employee benefit plans	44			49			—			—		93
Issuance of debt	—			332			1			—		333
Repayment of debt	—			(416		)	(11		)	—		(427		)
Cash dividends to shareholders	(104		)	(49		)	—			—		(153		)
Purchase of shares from noncontrolling interests	—			—			—			—		—
Dividends paid to noncontrolling interests	—			—			(17		)	—		(17		)
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES	63			192			(1,051		)	—		(796		)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			15			—		15
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1			79			(62		)	—		18
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	—			(21		)	293			—		272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	1		$	58		$	231		$	—	$	290

XML

Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

The change in the net carrying amount of goodwill by reportable segment for the nine months ended September 30, 2013 is as follows (in millions):

	Risk Solutions			HR Solutions			Total
Balance as of December 31, 2012	$	5,982		$	2,961		$	8,943
Goodwill related to current year acquisitions	24			2			26
Goodwill related to disposals	(3		)	—			(3		)
Goodwill related to prior year acquisitions	(2		)	17			15
Foreign currency translation	(19		)	(4		)	(23		)
Balance as of September 30, 2013	$	5,982		$	2,976		$	8,958

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

	September 30, 2013						December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Intangible assets with indefinite lives:
Tradenames	$	1,025	$	—	$	1,025	$	1,025	$	—	$	1,025
Intangible assets with finite lives:
Customer related and contract based	2,686		1,218		1,468		2,714		969		1,745
Marketing, technology and other (1)	611		447		164		619		414		205
	$	4,322	$	1,665	$	2,657	$	4,358	$	1,383	$	2,975

 ______________________________________________

(1) Tradenames with finite lives disclosed separately in prior years are now presented in Marketing, technology and other

Amortization expense from finite lived intangible assets was $98 million and $296 million for the three and nine months endedSeptember 30, 2013, respectively. Amortization expense from finite lived intangible assets was $105 million and $313 million for the three and nine months endedSeptember 30, 2012, respectively.

The estimated future amortization for finite lived intangible assets as of September 30, 2013 is as follows (in millions):

	HR Solutions		Risk Solutions		Total
Remainder of 2013	$	70	$	28	$	98
2014	243		95		338
2015	212		79		291
2016	177		67		244
2017	140		56		196
Thereafter	342		123		465
	$	1,184	$	448	$	1,632

XML

Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue
Commissions, fees and other	$ 2,786	$ 2,726	$ 8,585	$ 8,368
Fiduciary investment income	8	11	21	31
Total revenue	2,794	2,737	8,606	8,399
Expenses
Compensation and benefits	1,666	1,620	5,103	4,920
Other general expenses	764	778	2,347	2,344
Total operating expenses	2,430	2,398	7,450	7,264
Operating income	364	339	1,156	1,135
Interest income	3	1	6	6
Interest expense	(53)	(57)	(153)	(173)
Intercompany interest income (expense)	0	0	0	0
Other income (expense)	39	(9)	54	3
Income from continuing operations before income taxes	353	274	1,063	971
Income tax (benefit) expense	89	64	275	257
Income from continuing operations	264	210	788	714
Loss from discontinued operations before income taxes	0	0	0	(1)
Income taxes	0	0	0	0
Loss from discontinued operations	0	0	0	(1)
Equity in earnings of subsidiaries, net of tax	0	0	0	0
Net income	264	210	788	713
Less: Net income attributable to noncontrolling interests	8	6	30	25
Net income attributable to Aon shareholders	256	204	758	688
Aon plc [Member]
Revenue
Commissions, fees and other	1	0	2	0
Fiduciary investment income	0	0	0	0
Total revenue	1	0	2	0
Expenses
Compensation and benefits	11	4	27	0
Other general expenses	0	19	14	20
Total operating expenses	11	23	41	20
Operating income	(10)	(23)	(39)	(20)
Interest income	0	0	1	0
Interest expense	(6)	0	(12)	0
Intercompany interest income (expense)	25	(8)	11	(11)
Other income (expense)	0	0	0	0
Income from continuing operations before income taxes	9	(31)	(39)	(31)
Income tax (benefit) expense	(2)	(3)	(11)	(4)
Income from continuing operations	11	(28)	(28)	(27)
Loss from discontinued operations before income taxes	0	0	0	0
Income taxes	0	0	0	0
Loss from discontinued operations	0	0	0	0
Equity in earnings of subsidiaries, net of tax	245	232	786	715
Net income	256	204	758	688
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	256	204	758	688
Aon Corporation [Member]
Revenue
Commissions, fees and other	0	0	0	0
Fiduciary investment income	0	0	0	1
Total revenue	0	0	0	1
Expenses
Compensation and benefits	14	(5)	34	31
Other general expenses	5	6	29	27
Total operating expenses	19	1	63	58
Operating income	(19)	(1)	(63)	(57)
Interest income	1	0	2	1
Interest expense	(39)	(45)	(106)	(125)
Intercompany interest income (expense)	11	48	96	141
Other income (expense)	13	10	10	13
Income from continuing operations before income taxes	(33)	12	(61)	(27)
Income tax (benefit) expense	(14)	16	(24)	(11)
Income from continuing operations	(19)	(4)	(37)	(16)
Loss from discontinued operations before income taxes	0	0	0	0
Income taxes	0	0	0	0
Loss from discontinued operations	0	0	0	0
Equity in earnings of subsidiaries, net of tax	127	186	617	598
Net income	108	182	580	582
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	108	182	580	582
Other Non-Guarantor Subsidiaries [Member]
Revenue
Commissions, fees and other	2,785	2,726	8,583	8,368
Fiduciary investment income	8	11	21	30
Total revenue	2,793	2,737	8,604	8,398
Expenses
Compensation and benefits	1,641	1,621	5,042	4,889
Other general expenses	759	753	2,304	2,297
Total operating expenses	2,400	2,374	7,346	7,186
Operating income	393	363	1,258	1,212
Interest income	2	1	3	5
Interest expense	(8)	(12)	(35)	(48)
Intercompany interest income (expense)	(36)	(40)	(107)	(130)
Other income (expense)	26	(19)	44	(10)
Income from continuing operations before income taxes	377	293	1,163	1,029
Income tax (benefit) expense	105	51	310	272
Income from continuing operations	272	242	853	757
Loss from discontinued operations before income taxes	0	0	0	(1)
Income taxes	0	0	0	0
Loss from discontinued operations	0	0	0	(1)
Equity in earnings of subsidiaries, net of tax	0	0	0	0
Net income	272	242	853	756
Less: Net income attributable to noncontrolling interests	8	6	30	25
Net income attributable to Aon shareholders	264	236	823	731
Consolidating Adjustments [Member]
Revenue
Commissions, fees and other	0	0	0	0
Fiduciary investment income	0	0	0	0
Total revenue	0	0	0	0
Expenses
Compensation and benefits	0	0	0	0
Other general expenses	0	0	0	0
Total operating expenses	0	0	0	0
Operating income	0	0	0	0
Interest income	0	0	0	0
Interest expense	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Other income (expense)	0	0	0	0
Income from continuing operations before income taxes	0	0	0	0
Income tax (benefit) expense	0	0	0	0
Income from continuing operations	0	0	0	0
Loss from discontinued operations before income taxes	0	0	0	0
Income taxes	0	0	0	0
Loss from discontinued operations	0	0	0	0
Equity in earnings of subsidiaries, net of tax	(372)	(418)	(1,403)	(1,313)
Net income	(372)	(418)	(1,403)	(1,313)
Less: Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Aon shareholders	$ (372)	$ (418)	$ (1,403)	$ (1,313)

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Shareholders' Equity (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Schedule of Net Income from Participating Securities

Income from continuing operations, income from discontinued operations and net income, attributable to participating securities, were as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Income from continuing operations	$	3	$	2	$	8	$	8
Income from discontinued operations	—		—		—		—
Net income	$	3	$	2	$	8	$	8

Schedule of components of weighted average number of shares

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

	Three months ended September 30,		Nine months ended September 30,
	2013	2012	2013	2012
Shares for basic earnings per share (1)	309.5	327.3	313.2	330.6
Common stock equivalents	3.4	3.7	3.5	3.8
Shares for diluted earnings per share	312.9	331.0	316.7	334.4

   ______________________________________________

(1) Includes 3.8 million and 4.5 million of participating securities for the three months ended September 30, 2013 and 2012, respectively, and 4.0 million and 4.7 million of participating securities for the nine months ended September 30, 2013 and 2012, respectively.

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 Investments (1)			Change in Fair Value of Derivatives (1)			Foreign Currency Translation Adjustments			Post-Retirement Benefit Obligation (2)			Total
Balance at December 31, 2012	$	—		$	(28	)	$	233		$	(2,815	)	$	(2,610	)
Other comprehensive income (loss) before reclassifications, net	12			(24		)	(78		)	(4		)	(94		)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	(20		)	20			—			100			100
Tax benefit	7			(8		)	—			(31		)	(32		)
Amounts reclassified from accumulated other comprehensive loss, net	(13		)	12			—			69			68
Net current period other comprehensive (loss) income	(1		)	(12		)	(78		)	65			(26		)
Balance at September 30, 2013	$	(1	)	$	(40	)	$	155		$	(2,750	)	$	(2,636	)

______________________________________________

(1) Reclassifications from Accumulated other comprehensive loss are recorded in Other income

(2) Reclassifications from Accumulated other comprehensive loss are recorded in Compensation and benefits

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Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Goodwill and Intangible Assets
Tradenames	$ 1,025			$ 1,025			$ 1,025
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	4,322			4,322			4,358
Intangible assets with finite lives, Accumulated Amortization	1,665			1,665			1,383
Intangible assets, Net Carrying Amount	2,657			2,657			2,975
Amortization expense on intangible assets	98		105	296		313
Estimated amortization for intangible assets
Remainder of 2013	98			98
2014	338			338
2015	291			291
2016	244			244
2017	196			196
Thereafter	465			465
Estimated future amortization for intangible assets	1,632			1,632
HR Solutions [Member]
Estimated amortization for intangible assets
Remainder of 2013	70			70
2014	243			243
2015	212			212
2016	177			177
2017	140			140
Thereafter	342			342
Estimated future amortization for intangible assets	1,184			1,184
Risk Solutions [Member]
Estimated amortization for intangible assets
Remainder of 2013	28			28
2014	95			95
2015	79			79
2016	67			67
2017	56			56
Thereafter	123			123
Estimated future amortization for intangible assets	448			448
Customer related and contract based [Member]
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	2,686			2,686			2,714
Intangible assets with finite lives, Accumulated Amortization	1,218			1,218			969
Intangible assets, Net Carrying Amount	1,468			1,468			1,745
Marketing, technology and other [Member]
Intangible assets with finite lives
Intangible assets with finite lives, Gross Carrying Amount	611	[1]		611	[1]		619	[1]
Intangible assets with finite lives, Accumulated Amortization	447	[1]		447	[1]		414	[1]
Intangible assets, Net Carrying Amount	$ 164	[1]		$ 164	[1]		$ 205	[1]

[1] Tradenames with finite lives disclosed separately in prior years are now presented in Marketing, technology and other

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Debt

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Debt

Debt

The Company uses proceeds from the commercial paper market from time to time in order to meet short-term working capital needs and from time to time to retire other debt obligations.  At September 30, 2013, the Company had $511 million in commercial paper outstanding as compared to $50 million of commercial paper outstanding at December 31, 2012. The increase was largely attributable to the use of commercial paper proceeds to repay the remaining balance outstanding of the term credit loan facility due October 2013. The weighted average commercial paper outstanding for the three and nine months endedSeptember 30, 2013 was $524 million and $349 million, respectively. The weighted average interest rate of the commercial paper outstanding for the three and nine months endedSeptember 30, 2013 was 0.33% and 0.35%, respectively.

During the quarter ended September 30, 2013, the €500 million ($674 million) debt securities due July 2014 were classified as Short-term debt and current portion of long-term debt in the Condensed Consolidated Statements of Financial Position as the date of maturity is less than one year.

On March 8, 2013, the Company issued $90 million in aggregate principal amount of 4.250% Notes Due 2042. The 4.250% Notes Due 2042 constitute a further issuance of, and were consolidated to form a single series of debt securities with, the $166 million aggregate principal amount of the 4.250% Notes Due 2042 issued by Aon plc on December 12, 2012 (collectively, the "Original Notes"). The Original Notes were unconditionally guaranteed as to the payment of principal and interest by Aon Corporation.

On April 15, 2013, an S-4 registration statement registering $256 million in aggregate principal amount of 4.250% Notes Due 2042 (the "Exchange Notes") under the Securities Act of 1933, as amended (the "Securities Act"), was declared effective by the Securities and Exchange Commission. The Exchange Notes were exchanged for the Original Notes. The form and terms of the Exchange Notes are substantially identical in all material respects to those of the Original Notes except that the Exchange Notes are registered under the Securities Act and the transfer restrictions, registration rights and related additional interest provisions applicable to the Original Notes do not apply to the Exchange Notes. Like the Original Notes, the Exchange Notes were issued by Aon plc and unconditionally guaranteed by Aon Corporation. All Original Notes were exchanged for Exchange Notes in the second quarter 2013.

On April 29, 2013, the Company amended its Euro Facility agreement to add Aon plc as an additional borrower. On May 8, 2013, the Company established a multi-currency commercial paper program in aggregate principal amount of up to €650 million. Aon Corporation is a guarantor under the program.

On May 21, 2013, the Company issued $250 million in aggregate principal amount of 4.45% Notes Due 2043. The 4.45% Notes Due 2043 were issued by Aon plc and fully and unconditionally guaranteed by Aon Corporation. The Company used the proceeds of the issuance to repay commercial paper borrowings and for general corporate purposes.

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Acquisitions and Dispositions

9 Months Ended

Sep. 30, 2013

Business Combinations [Abstract]

Acquisitions and Dispositions

Acquisitions and Dispositions

Acquisitions

During the nine months ended September 30, 2013, the Company completed the acquisition of five businesses in the Risk Solutions segment and two businesses in the HR Solutions segment.  During the nine months ended September 30, 2012, the Company completed the acquisition of two businesses in the HR Solutions segment and four businesses in the Risk Solutions segment.

The following table includes the aggregate consideration transferred and the preliminary value of intangible assets recorded as a result of the Company’s acquisitions:

	Nine months ended September 30,
(millions)	2013		2012
Consideration	$	26	$	110
Intangible assets:
Goodwill	$	26	$	60
Other intangible assets	8		56
Total	$	34	$	116

The results of operations of these acquisitions are included in the Condensed Consolidated Financial Statements as of the acquisition date.  The results of operations of the Company would not have been materially different if these acquisitions had been reported from the beginning of the period.

Dispositions

During the nine months ended September 30, 2013, the Company completed the sale of five businesses in the Risk Solutions segment. A pretax gain of $0.2 million was recognized on these sales, which is included in Other income (expense) in the Condensed Consolidated Statements of Income. During the nine months ended September 30, 2012, the Company completed the sale of two businesses in the Risk Solutions segment and one business in the HR Solutions segment.  A pretax gain of $1 million was recognized on these sales, which is included in Other income (expense) in the Condensed Consolidated Statements of Income.

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Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 788	$ 713
Adjustments to reconcile net income to cash provided by operating activities:
Gain from sales of businesses and investments, net	(28)	(1)
Depreciation of fixed assets	177	168
Amortization of intangible assets	296	313
Share-based compensation expense	207	160
Deferred income taxes	100	21
Change in assets and liabilities:
Fiduciary receivables	684	(447)
Short term investments - funds held on behalf of clients	(369)	118
Fiduciary liabilities	(315)	329
Receivables, net	374	240
Accounts payable and accrued liabilities	(330)	(347)
Restructuring reserves	(7)	(43)
Current income taxes	(197)	67
Pension, other post-retirement and other post-employment liabilities	(401)	(414)
Other assets and liabilities	5	(10)
CASH PROVIDED BY OPERATING ACTIVITIES	984	867
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of long-term investments	81	171
Purchases of long-term investments	(13)	(9)
Net (purchases) sales of short-term investments - non-fiduciary	(13)	66
Acquisition of businesses, net of cash acquired	(26)	(97)
Proceeds from sale of businesses	6	2
Capital expenditures	(174)	(201)
CASH USED FOR INVESTING ACTIVITIES	(139)	(68)
CASH FLOWS FROM FINANCING ACTIVITIES
Share repurchase	(1,025)	(625)
Issuance of shares for employee benefit plans	84	93
Issuance of debt	4,270	333
Repayment of debt	(3,870)	(427)
Cash dividends to shareholders	(159)	(153)
Purchase of shares from noncontrolling interests	(6)	0
Dividends paid to noncontrolling interests	(13)	(17)
CASH USED FOR FINANCING ACTIVITIES	(719)	(796)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(48)	15
NET INCREASE IN CASH AND CASH EQUIVALENTS	78	18
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	291	272
CASH AND CASH EQUIVALENTS AT END OF PERIOD	369	290
Supplemental disclosures:
Interest paid	186	172
Income taxes paid, net of refunds	$ 330	$ 139

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Share-Based Compensation Plans (Details 2) (Stock options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Stock options [Member]
Share Options
Outstanding at beginning of period (in shares)	5,611	9,116
Granted (in shares)	0	0
Exercised (in shares)	(1,694)	(2,570)
Forfeited and expired (in shares)	(29)	(67)
Outstanding at end of period (in shares)	3,888	6,479
Exercisable at end of period (in shares)	3,681	5,969
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 32	$ 32
Granted (in dollars per share)		$ 0
Exercised (in dollars per share)	$ 32	$ 31
Forfeited and expired (in dollars per share)	$ 34	$ 37
Outstanding at end of period (in dollars per share)	$ 32	$ 32
Exercisable at end of period (in dollars per share)	$ 32	$ 31
Weighted average remaining contractual life of share options outstanding (in years)	2 years 2 months 24 days	2 years 9 months 18 days

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Shareholders' Equity Schedule of Net Income from Participating Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income from participating securities	$ 3	$ 2	$ 8	$ 8
Continuing Operations [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income from participating securities	3	2	8	8
Discontinued Operations [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income from participating securities	$ 0	$ 0	$ 0	$ 0

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Derivatives and Hedging (Tables)

9 Months Ended

Sep. 30, 2013

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				Derivative Assets				Derivative Liabilities
	September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	169	$	336	$	8	$	17	$	—	$	—
Foreign exchange contracts	1,159		1,208		56		191		112		250
Total	1,328		1,544		64		208		112		250
Derivatives not accounted for as hedges:
Foreign exchange contracts	267		305		1		2		1		1
Total	$	1,595	$	1,849	$	65	$	210	$	113	$	251

Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	8	$	17	$	—		$	—		$	8	$	17
Foreign exchange contracts	56		191		(25		)	(160		)	31		31
Total	64		208		(25		)	(160		)	39		48
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		2		(1		)	—			—		2
Total	$	65	$	210	$	(26	)	$	(160	)	$	39	$	50

______________________________________________

(1) Included within Other current assets or Other non-current assets

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	112		250		(25		)	(160		)	87		90
Total	112		250		(25		)	(160		)	87		90
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		1		(1		)	—			—		1
Total	$	113	$	251	$	(26	)	$	(160	)	$	87	$	91

______________________________________________

(2) Included within Other current liabilities or Other non-current liabilities

Derivative gains (losses)

The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three and nine months endedSeptember 30, 2013 and 2012 are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:
Cash Flow Hedges:
Interest rate contracts	$	—		$	—		$	—		$	—
Foreign exchange contracts	—			16			(28		)	(14		)
Total	$	—		$	16		$	(28	)	$	(14	)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	3		$	—		$	4
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):
Cash Flow Hedges:
Interest rate contracts (1)	$	—		$	—		$	(1	)	$	—
Foreign exchange contracts (2)	(10		)	(7		)	(7		)	(23		)
Total	(10		)	(7		)	(8		)	(23		)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	—		$	—		$	—

  ______________________________________________

(1) Included within Fiduciary investment income and Interest expense

(2) Included within Other income (expense) and Interest expense

	Three months ended September 30,										Nine months ended September 30,
	Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)						Amount of Gain (Loss) Recognized in Income on Related Hedge Item (2)				Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)					Amount of Gain (Loss) Recognized in Income on Related Hedge Item (1) (2)
	2013			2012			2013		2012		2013			2012		2013		2012
Fair value hedges:
Interest rate contracts	$	(7	)	$	(3	)	$	7	$	3	$	(8	)	$	—	$	8	$	—

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

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Commitments and Contingencies (Details)			1 Months Ended		3 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	May 31, 2010 Opry Mills Mall Limited Partnership [Member] USD ($)	Dec. 31, 2012 Mazeikiu Nafta [Member] USD ($)	Sep. 30, 2013 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($)	Sep. 30, 2013 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($)	Jun. 15, 2011 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Term Credit Agreement [Member] USD ($)	Mar. 20, 2012 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Five-Year Agreement [Member] USD ($)	Oct. 14, 2010 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Euro Facility Agreement [Member] EUR (€)
Legal, Guarantees and Indemnifications
Damages sought			$ 200,000,000	$ 125,000,000
Amount of coverage for damages contended by the insurers			50,000,000
Difference amount of damages sought by the client			150,000,000
Maximum potential funding under commitments	81,000,000	104,000,000			35,000,000	35,000,000	450,000,000	400,000,000	650,000,000
Term of credit agreement								5 years
Letters of credit outstanding	71,000,000	74,000,000
Commitments funded					$ 7,000,000	$ 13,000,000

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Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [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,
	2013		2012		2013		2012
Restricted stock units (“RSUs”)	$	40	$	37	$	135	$	120
Performance share awards (“PSAs”)	28		15		66		30
Stock options	—		1		1		4
Employee stock purchase plans	2		2		5		6
Total stock-based compensation expense	$	70	$	55	$	207	$	160

Share Awards

A summary of the status of the Company’s RSUs is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Fair Value (1)		Shares		Fair Value (1)
Non-vested at beginning of period	10,432		$	44	9,916		$	42
Granted	3,598		62		4,888		46
Vested	(3,618	)	44		(3,343	)	42
Forfeited	(308	)	47		(516	)	44
Non-vested at end of period	10,104		51		10,945		44

 ______________________________________________

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

The vesting of PSAs is contingent upon meeting various individual, divisional or company-wide performance conditions, including revenue generation, or growth in revenue, pretax income or earnings per share over a one to five-year period. The performance conditions are not considered in the determination of the grant date fair value for these awards. The fair value of PSAs is based upon the market price of an Aon ordinary share at the date of grant. Compensation expense is recognized over the performance period, and in certain cases an additional vesting period, based on management's estimate of the number of units expected to vest. Compensation expense is adjusted to reflect the actual number of shares issued at the end of the programs. The actual issue of shares may range from 0-200% of the target number of PSAs granted, based on the plan. Dividend equivalents are not paid on PSAs.

Information as of September 30, 2013 regarding 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, 2013 and the years ended December 31, 2012 and 2011, respectively, is as follows (shares in thousands, dollars in millions, except fair value):

	As of September 30, 2013		As of December 31, 2012		As of December 31, 2011
Target PSAs granted	1,135		1,369		1,715
Fair value (1)	$	58	$	47	$	50
Number of shares that would be issued based on current performance levels	1,135		2,232		1,386
Unamortized expense, based on current performance levels	$	53	$	46	$	5

 ______________________________________________

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

Share Options

The Company did not grant any share options during the nine months ended September 30, 2013 or 2012, respectively.

A summary of the status of the Company’s share options and related information is as follows (shares in thousands):

	Nine months ended September 30,
	2013				2012
	Shares		Weighted- Average Exercise Price		Shares		Weighted- Average Exercise Price
Beginning outstanding	5,611		$	32	9,116		$	32
Granted	—				—		—
Exercised	(1,694	)	32		(2,570	)	31
Forfeited and expired	(29	)	34		(67	)	37
Outstanding at end of period	3,888		32		6,479		32
Exercisable at end of period	3,681		32		5,969		31

The weighted average remaining contractual life, in years, of outstanding options was 2.2 years and 2.8 years at September 30, 2013 and 2012, respectively.

The aggregate intrinsic value represents the total pretax intrinsic value, based on options with an exercise price less than the Company’s closing stock price of $74.44 as of September 30, 2013, which would have been received by the option holders had those option holders exercised their options as of that date.  At September 30, 2013, the aggregate intrinsic value of options outstanding was $163 million, of which $156 million was exercisable.

Other information related to the Company’s share options is as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2013		2012		2013		2012
Aggregate intrinsic value of stock options exercised	$	14	$	23	$	53	$	47
Cash received from the exercise of stock options	14		29		55		80
Tax benefit realized from the exercise of stock options	3		5		10		8

Unamortized deferred compensation expense, which includes both options and awards, amounted to $373 million as of September 30, 2013, with a remaining weighted-average amortization period of approximately 2.1 years.

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Investments

9 Months Ended

Sep. 30, 2013

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

The Company earns income on cash balances and investments, as well as on premium trust balances that the Company maintains for premiums collected from insureds but not yet remitted to insurance companies, and funds held under the terms of certain outsourcing agreements to pay certain obligations on behalf of clients.  Premium trust balances and receivables, as well as a corresponding liability, are included in Fiduciary assets and Fiduciary liabilities in the accompanying Condensed Consolidated Statements of Financial Position.

The Company’s interest-bearing assets and other investments are included in the following categories in the Condensed Consolidated Statements of Financial Position (in millions):

	September 30, 2013		December 31, 2012
Cash and cash equivalents	$	369	$	291
Short-term investments	357		346
Fiduciary assets (1)	4,335		4,029
Investments	139		165
	$	5,200	$	4,831

  ______________________________________________

(1) Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

The Company’s investments are as follows (in millions):

	September 30, 2013		December 31, 2012
Equity method investments	$	113	$	102
Other investments (2)	17		43
Fixed-maturity securities (3)	9		20
	$	139	$	165

  ______________________________________________

(2) The reduction in other investments is due to the sale of certain equity securities.

(3) The reduction in fixed-maturity securities is due to the repayment in full of a security.

XML

Commitments and Contingencies

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and 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. Aon has historically purchased E&O insurance and other insurance 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 historical claims. Accruals for these exposures, and related insurance receivables, when applicable, have been provided to the extent that losses are deemed probable and are reasonably estimable. These amounts are adjusted from time to time as developments warrant. Amounts related to settlement provisions are recorded in Other general expenses in the Condensed Consolidated Statements of Income.

A retail insurance brokerage subsidiary of Aon provides insurance brokerage services to Northrop Grumman Corporation (“Northrop”). This Aon subsidiary placed Northrop’s excess property insurance program for the period covering 2005. Northrop suffered a substantial loss in August 2005 when Hurricane Katrina damaged Northrop’s facilities in the Gulf states. Northrop’s excess insurance carrier, Factory Mutual Insurance Company (“Factory Mutual”), denied coverage for the claim pursuant to a flood exclusion. Northrop sued Factory Mutual in the United States District Court for the Central District of California and later sought to add this Aon subsidiary as a defendant, asserting that if Northrop’s policy with Factory Mutual does not cover the losses suffered by Northrop stemming from Hurricane Katrina, then this Aon subsidiary will be responsible for Northrop’s losses. On August 26, 2010, the court granted in large part Factory Mutual’s motion for partial summary judgment regarding the applicability of the flood exclusion and denied Northrop’s motion to add this Aon subsidiary as a defendant in the federal lawsuit. On January 27, 2011, Northrop filed suit against this Aon subsidiary in state court in Los Angeles, California, pleading claims for negligence, breach of contract and negligent misrepresentation. Northrop has since settled with Factory Mutual. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Another retail insurance brokerage subsidiary of Aon has been sued in Tennessee state court by a client, Opry Mills Mall Limited Partnership (“Opry Mills”) that sustained flood damage to its property in May 2010. The lawsuit seeks $200 million from numerous insurers with whom this Aon subsidiary placed the client’s property insurance coverage. The insurers contend that only $50 million in coverage is available for the loss because the flood event occurred on property in a high hazard flood zone. Opry Mills is seeking full coverage from the insurers for the loss and has sued this Aon subsidiary in the alternative for the same $150 million difference on various theories of professional liability if the court determines there is not full coverage. In addition, Opry Mills seeks prejudgment interest, attorneys' fees and enhanced damages which could substantially increase Aon's exposure. Aon believes it has meritorious defenses and intends to vigorously defend itself against these claims. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

A pensions consulting and administration subsidiary of Hewitt prior to its acquisition by Aon provided advisory services to the Trustees of the Philips UK pension fund and the relevant employer of fund beneficiaries (together, “Philips”). In December 2011, the Aon subsidiary received notice of a potential claim alleging negligence and breach of duty. The notice asserts Philips’ right to claim damages related to Philips’ use of a credit default swap hedging strategy pursuant to the supply of the advisory services, which is said to have resulted in substantial damages to Philips. No lawsuit has yet been filed. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this circumstance, and the amount of any losses or other payments that may result, cannot be estimated at this time.

Mazeikiu Nafta ("MN"), which operates an oil refinery in Lithuania, has sued an insurance brokerage subsidiary of Aon in London. Aon placed property damage and business interruption coverage for MN. There was a fire at the refinery in 2006. MN settled with insurers in November 2011 and claimed against Aon in December 2012. The claim is for $125 million, which is the shortfall alleged by MN to have been caused by Aon's failure to obtain appropriate business interruption coverage. Aon believes that it has meritorious defenses and intends to vigorously defend itself against these allegations. The outcome of this lawsuit, and the amount of any losses or other payments that may result, cannot be estimated at this time.

From time to time, Aon’s clients may bring claims and take legal action pertaining to the performance of fiduciary responsibilities. Whether client claims and legal action related to the Company’s performance of fiduciary responsibilities are founded or unfounded, if such claims and legal actions are resolved in a manner unfavorable to the Company, they may adversely affect Aon’s financial results and materially impair the market perception of the Company and that of its products and services.

Although the ultimate outcome of all matters referred to above cannot be ascertained, and liabilities in indeterminate amounts may be imposed on Aon or its subsidiaries, on the basis of present information, amounts already provided, availability of insurance coverages and legal advice received, it is the opinion of management that the disposition or ultimate determination of such claims will not have a material adverse effect on the consolidated financial position of Aon. However, it is possible that future results of operations or cash flows for any particular quarterly or annual period could be materially affected by an unfavorable resolution of these matters.

Guarantees and Indemnifications

In connection with the redomicile of Aon's headquarters ("the Redomestication"), the Company on April 2, 2012 entered 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), (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) (4) First Supplemental Indenture, dated as of April 2, 2012, among Aon Finance N.S. 1, ULC, as issuer, Aon Corporation, as guarantor, Aon plc, as guarantor, and Computershare Trust Company of Canada, as trustee, and (5) Amended and Restated Trust Deed, among Aon Corporation, Aon plc, Aon Services Luxembourg & Co S.C.A. (formerly known as Aon Financial Services Luxembourg S.A.) (“Aon Luxembourg”) and BNY Mellon Corporate Trustee Services Limited, as trustee (the “Luxembourg Trustee”) (amending and restating the Trust Deed, dated as of July 1, 2009, as amended and restated on January 12, 2011, among Aon Delaware, Aon Luxembourg and the Luxembourg Trustee).

Effective as of the same date, the Company also entered into agreements pursuant to which it agreed to guarantee the obligations of its subsidiaries arising under the (1) $450,000,000 Term Credit Agreement dated June 15, 2011, among Aon Corporation, as borrower, Bank of America, N.A., as administrative agent and the other agents and lenders party thereto, (2) $400,000,000Five-Year Agreement dated March 20, 2012, among Aon Corporation, as borrower, Citibank, N.A., as administrative agent and the other agents and lenders party thereto and (3) €650,000,000 Facility Agreement, dated October 15, 2010, among Aon Corporation, the subsidiaries of Aon Corporation party thereto as borrowers, Citibank International plc, as agent, and the other agents and lenders party thereto, as amended on July 18, 2011.

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 that are deemed to be probable and reasonably estimable are included in the Company’s Condensed Consolidated Financial Statements.

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

Letters of Credit

The Company had total letters of credit (“LOCs”) outstanding for approximately $71 million at September 30, 2013, as compared to $74 million at December 31, 2012. These letters of credit 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 issued LOCs to cover contingent payments for taxes and other business obligations to third parties, and other guarantees for miscellaneous purposes at its international subsidiaries. Amounts are accrued in the Condensed Consolidated Financial Statements to the extent the guarantees are probable and estimable.

Commitments

The Company has provided commitments to fund certain limited partnerships in which it has an interest in the event that the general partners request funding. Some of these commitments have specific expiration dates and the maximum potential funding under these commitments was $35 million at September 30, 2013. During the three and nine months endedSeptember 30, 2013, the Company funded $7 million and $13 million, respectively of these commitments.

Premium Payments

The Company has certain contractual contingent guarantees for premium payments owed by clients to certain insurance companies. Costs associated with these guarantees, to the extent estimable and probable, are provided in Aon’s allowance for doubtful accounts. The maximum exposure with respect to such contractual contingent guarantees was approximately $81 million at September 30, 2013 as compared to $104 million at December 31, 2012.

XML

Derivatives and Hedging

9 Months Ended

Sep. 30, 2013

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 receives revenues, pays expenses, or enters into intercompany loans denominated in a currency that differs from its functional currency, or other transactions that are denominated in a currency other than 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 two years; however, in limited instances, the Company has hedged certain exposures up to five years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to hedge its net investments in foreign operations for up to two years in the future.

The Company also uses foreign exchange derivatives, typically forward contracts and options, to manage 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, for up to one year in the future. These derivatives are not accounted for as hedges, and changes in fair value are recorded each period in Other income in the Condensed Consolidated Statements of Income.

Interest Rate Risk Management

The Company holds variable-rate short-term brokerage and other operating deposits. The Company uses interest rate derivatives, typically swaps, to reduce its exposure to the effects of interest rate fluctuations on the forecasted interest receipts from these deposits for up to two years in the future.

Certain derivatives also give rise to credit risks from the possible non-performance by counterparties.  The credit risk at the balance sheet date is generally limited to the fair value of those contracts that are favorable to the Company.  The Company has reduced its credit risk by using International Swaps and Derivatives Association (“ISDA”) master agreements, collateral and credit support arrangements, entering into non-exchange-traded derivatives with highly-rated major financial institutions and by using exchange-traded instruments.  The Company monitors the creditworthiness of, and exposure to, its counterparties.  As of September 30, 2013, all net derivative positions were free of credit risk contingent features.  The Company has not received or pledged any collateral related to derivative arrangements as of September 30, 2013.

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

	Notional Amount				Derivative Assets				Derivative Liabilities
	September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012		September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	169	$	336	$	8	$	17	$	—	$	—
Foreign exchange contracts	1,159		1,208		56		191		112		250
Total	1,328		1,544		64		208		112		250
Derivatives not accounted for as hedges:
Foreign exchange contracts	267		305		1		2		1		1
Total	$	1,595	$	1,849	$	65	$	210	$	113	$	251

Offsetting of financial assets and derivatives assets are as follows (in millions):

	Gross Amounts of Recognized Assets				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Assets Presented in the Statement of Financial Position (1)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	8	$	17	$	—		$	—		$	8	$	17
Foreign exchange contracts	56		191		(25		)	(160		)	31		31
Total	64		208		(25		)	(160		)	39		48
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		2		(1		)	—			—		2
Total	$	65	$	210	$	(26	)	$	(160	)	$	39	$	50

______________________________________________

(1) Included within Other current assets or Other non-current assets

Offsetting of financial liabilities and derivative liabilities are as follows (in millions):

	Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Statement of Financial Position						Net Amounts of Liabilities Presented in the Statement of Financial Position (2)
	September 30, 2013		December 31, 2012		September 30, 2013			December 31, 2012			September 30, 2013		December 31, 2012
Derivatives accounted for as hedges:
Interest rate contracts	$	—	$	—	$	—		$	—		$	—	$	—
Foreign exchange contracts	112		250		(25		)	(160		)	87		90
Total	112		250		(25		)	(160		)	87		90
Derivatives not accounted for as hedges:
Foreign exchange contracts	1		1		(1		)	—			—		1
Total	$	113	$	251	$	(26	)	$	(160	)	$	87	$	91

______________________________________________

(2) Included within Other current liabilities or Other non-current liabilities

The amounts of derivative gains (losses) recognized in the Condensed Consolidated Financial Statements for the three and nine months endedSeptember 30, 2013 and 2012 are as follows (in millions):

	Three months ended September 30,						Nine months ended September 30,
	2013			2012			2013			2012
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:
Cash Flow Hedges:
Interest rate contracts	$	—		$	—		$	—		$	—
Foreign exchange contracts	—			16			(28		)	(14		)
Total	$	—		$	16		$	(28	)	$	(14	)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	3		$	—		$	4
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):
Cash Flow Hedges:
Interest rate contracts (1)	$	—		$	—		$	(1	)	$	—
Foreign exchange contracts (2)	(10		)	(7		)	(7		)	(23		)
Total	(10		)	(7		)	(8		)	(23		)
Foreign Net Investment Hedges:
Foreign exchange contracts	$	—		$	—		$	—		$	—

  ______________________________________________

(1) Included within Fiduciary investment income and Interest expense

(2) Included within Other income (expense) and Interest expense

	Three months ended September 30,										Nine months ended September 30,
	Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)						Amount of Gain (Loss) Recognized in Income on Related Hedge Item (2)				Amount of Gain (Loss) Recognized in Income on Derivative (1) (2)					Amount of Gain (Loss) Recognized in Income on Related Hedge Item (1) (2)
	2013			2012			2013		2012		2013			2012		2013		2012
Fair value hedges:
Interest rate contracts	$	(7	)	$	(3	)	$	7	$	3	$	(8	)	$	—	$	8	$	—

  ______________________________________________

(1) Relates to fixed rate debt

(2) Included in Interest expense

The Company estimates that approximately $27 million of pretax losses currently included within Accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

The amount of gain (loss) recognized in income on the ineffective portion of derivatives for the three and nine months endedSeptember 30, 2013 and 2012 was not material.

During the three and nine months endedSeptember 30, 2013, the Company recorded a gain of $3 million and a loss of $15 million, respectively, in Other income (expense) for foreign exchange derivatives not designated or qualifying as hedges. During the three and nine months endedSeptember 30, 2012, the Company recorded a gain of $6 million and $12 million, respectively, in Other income (expense) for foreign exchange derivatives not designated or qualifying as hedges.

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2013
Document and Entity Information
Entity Registrant Name	Aon plc
Entity Central Index Key	0000315293
Document Type	10-Q
Document Period End Date	Sep. 30, 2013
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	301,048,034
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3

XML

Fair Value and Financial Instruments

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value and Financial Instruments

Fair Value 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 and highly liquid debt securities are carried at cost and amortized cost, respectively, as an approximation of fair value. Based on market convention, the Company considers cost a practical and expedient measure of fair value.

Cash, cash equivalents, and highly liquid debt instruments consist of cash and institutional short-term investment funds. The Company independently reviews the short-term investment funds to obtain reasonable assurance the fund net asset value is $1 per share.

Equity investments consist of domestic and international equity securities and exchange traded 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 equity security and volatility. The Company independently reviews the listing of Level 1 equity securities in the portfolio and agrees the closing stock prices to a national securities exchange, and on a sample basis, 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 a detailed understanding of the models, inputs, and assumptions used in developing prices provided by its vendors. This understanding includes discussions with valuation resources at the vendor. During these discussions, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the pricing vendor and 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 a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates used in the Condensed Consolidated Financial Statements.

Pooled funds consist of various equity, fixed income, commodity, and real estate mutual fund type investment vehicles. Pooled investment funds fair value is estimated based on the proportionate share ownership in the underlying net assets of the investment, which is based on the fair value of the underlying securities that trade on a national securities exchange. Where possible, the Company independently reviews the listing securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the fund and discusses fund performance with pooled fund managers. The Company obtains audited fund manager financial statements, when available. If the pooled fund is designed to replicate a publicly traded index, the Company compares the performance of the fund to the index to assess the reasonableness of the fair value measurement.

Alternative investments consist of limited partnerships, private equity and hedge funds. Alternative investment fair value is generally estimated based on the proportionate share ownership in the underlying net assets of the investment as determined by the general partner or investment manager. The valuations are based on various factors depending on investment strategy, proprietary models, and specific financial data or projections. The Company obtains audited fund manager financial statements, when available. The Company obtains a detailed understanding of the models, inputs and assumptions used in developing prices provided by the investment managers (or appropriate party) through regular discussions. During these discussions with the investment managers, the Company uses a fair value measurement questionnaire, which is part of the Company’s internal controls over financial reporting, to obtain the information necessary to assert the model, inputs and assumptions used comply with U.S. GAAP, including disclosure requirements. The Company also obtains observable inputs from the investment manager and 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 a member of management and the fair value estimate provided by the vendor is adjusted, if deemed appropriate. These adjustments do not occur frequently and have not historically been material to the fair value estimates in the Condensed Consolidated 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.

Annuity contracts consist of insurance group annuity contracts purchased to match the pension benefit payment stream owed to certain selected plan participant demographics within a few major United Kingdom defined benefit plans. Annuity contracts are valued using a discounted cash flow model utilizing assumptions such as discount rate, mortality, and inflation. The Company independently verifies the observable inputs.

Real estate and REITs consist of publicly traded REITs and direct real estate investments. Level 1 REITs are valued using the closing stock price on a national securities exchange. The Level 3 values are based on the proportionate share of ownership in the underlying net asset value as determined by the investment manager. The Company independently reviews the listing of Level 1 REIT securities in the portfolio and agrees the closing stock prices to a national securities exchange. The Company gains an understanding of the investment guidelines and valuation policies of the Level 3 real estate funds and discusses performance with the fund managers. The Company obtains audited fund manager financial statements, when available. See the description of “Alternative investments” for further detail on valuation procedures surrounding Level 3 REITs.

Guarantees are carried at fair value, which is based on discounted estimated cash flows using published historical cumulative default rates and discount rates commensurate with the underlying exposure.

Debt is carried at outstanding principal balance, less any unamortized 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, 2013 and December 31, 2012 (in millions):

			Fair Value Measurements Using
	Balance at September 30, 2013		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 and highly liquid debt securities (1)	$	2,098	$	2,073	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	2		—		—		2
Government bonds	7		—		7		—
Equity securities	9		5		4		—
Derivatives:
Interest rate contracts	8		—		8		—
Foreign exchange contracts	57		—		57		—
Liabilities:
Derivatives:
Foreign exchange contracts	113		—		113		—

  ______________________________________________

(1) Includes $2,073 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

			Fair Value Measurements Using
	Balance at December 31, 2012		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 and highly liquid debt securities (1)	$	2,133	$	2,108	$	25	$	—
Other investments:
Fixed maturity securities:
Corporate bonds	12		—		—		12
Government Bonds	8		—		8		—
Equity securities	5		5		—		—
Derivatives:
Interest rate contracts	17		—		17		—
Foreign exchange contracts	193		—		193		—
Liabilities:
Derivatives:
Foreign exchange contracts	251		—		251		—

  ______________________________________________

(1)  Includes $2,108 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity.  See Note 8 “Investments” for additional information regarding the Company’s investments.

There were no transfers of assets or liabilities between fair value hierarchy levels in the three and nine months endedSeptember 30, 2013 and 2012, respectively. The Company recognized $6 million of realized gains and no unrealized gains during the three and nine months endedSeptember 30, 2013, respectively, related to assets and liabilities measured at fair value using unobservable inputs. There were no realized or unrealized gains or losses recognized in the Condensed Consolidated Statements of Income or Financial Position during either the three or nine months ended September 30, 2012 related to assets and liabilities measured at fair value using unobservable inputs.

The fair value of all long-term debt instruments is classified as Level 2. The following table discloses the Company’s financial instruments where the carrying amounts and fair values differ (in millions):

	September 30, 2013				December 31, 2012
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	3,352	$	3,583	$	3,713	$	4,162

XML

Guarantee of Registered Securities Guarantee of Registered Securities (Narrative) (Details)	Sep. 30, 2013
Aon plc [Member]
Condensed Financial Statements, Captions [Line Items]
Parent company's percentage ownership of guarantors	100.00%
3.50% senior notes due September 2015 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	3.50%
3.125% Senior notes due 2016 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	3.125%
5.00% Senior notes due September 2020 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	5.00%
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	8.205%
6.25% Senior notes due September 2040 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	6.25%
4.250% Senior notes due 2042 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	4.25%
4.45% notes due 2043 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate	4.45%

XML

Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012
Segment Reporting Information
Number of reportable segments			2
Total revenue	$ 2,794	$ 2,737	$ 8,606	$ 8,399
Total commissions, fees and other revenue	2,786	2,726	8,585	8,368
Total fiduciary investment income	8	11	21	31
Operating income before income tax	364	339	1,156	1,135
Interest income	3	1	6	6
Interest expense	(53)	(57)	(153)	(173)
Other income (expense)	39	(9)	54	3
Income from continuing operations before income taxes	353	274	1,063	971
Total operating segments [Member]
Segment Reporting Information
Operating income before income tax	408	389	1,289	1,270
Risk Solutions [Member]
Segment Reporting Information
Total revenue	1,821	1,778	5,736	5,582
Total commissions, fees and other revenue	1,813	1,767	5,715	5,551
Total fiduciary investment income	8	11	21	31
Operating income before income tax	333	309	1,127	1,059
Retail brokerage
Segment Reporting Information
Total commissions, fees and other revenue	1,424	1,390	4,548	4,395
Reinsurance brokerage
Segment Reporting Information
Total commissions, fees and other revenue	389	377	1,167	1,156
HR Solutions [Member]
Segment Reporting Information
Total revenue	981	971	2,891	2,847
Total commissions, fees and other revenue	981	971	2,891	2,847
Total fiduciary investment income	0	0	0	0
Operating income before income tax	75	80	162	211
Consulting services
Segment Reporting Information
Total commissions, fees and other revenue	406	394	1,176	1,140
Outsourcing
Segment Reporting Information
Total commissions, fees and other revenue	587	585	1,746	1,723
Intrasegment
Segment Reporting Information
Total commissions, fees and other revenue	(12)	(8)	(31)	(16)
Intersegment elimination
Segment Reporting Information
Total revenue	(8)	(12)	(21)	(30)
Total commissions, fees and other revenue	(8)	(12)	(21)	(30)
Unallocated Expense
Segment Reporting Information
Operating income before income tax	$ (44)	$ (50)	$ (133)	$ (135)