Condensed Consolidated Statements of Financial Position (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 597	$ 756
Short-term investments	118	529
Receivables, net	3,053	2,478
Fiduciary assets	10,738	9,625
Other current assets	609	289
Total Current Assets	15,115	13,677
Goodwill	8,550	8,358
Intangible assets, net	1,662	1,733
Fixed assets, net	578	564
Deferred tax assets	296	389
Prepaid pension	1,207	1,060
Other non-current assets	439	307
TOTAL ASSETS	27,847	26,088
CURRENT LIABILITIES
Accounts payable and accrued liabilities	1,545	1,961
Short-term debt and current portion of long-term debt	403	299
Fiduciary liabilities	10,738	9,625
Other current liabilities	972	870
Total Current Liabilities	13,658	12,755
Long-term debt	5,697	5,667
Deferred tax liabilities	243	127
Pension, other postretirement, and postemployment liabilities	1,759	1,789
Other non-current liabilities	1,105	1,102
TOTAL LIABILITIES	22,462	21,440
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2018 - 245.2; 2017 - 247.6)	2	2
Additional paid-in capital	5,743	5,775
Retained earnings	2,747	2,302
Accumulated other comprehensive loss	(3,191)	(3,496)
TOTAL AON SHAREHOLDERS' EQUITY	5,301	4,583
Noncontrolling interests	84	65
TOTAL EQUITY	5,385	4,648
TOTAL LIABILITIES AND EQUITY	$ 27,847	$ 26,088