Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 408	$ 291
Short-term investments	352	346
Receivables, net	2,884	3,101
Fiduciary assets	12,224	12,214
Other current assets	389	430
Total Current Assets	16,257	16,382
Goodwill	8,786	8,943
Intangible assets, net	2,844	2,975
Fixed assets, net	816	820
Investments	152	165
Other non-current assets	1,174	1,201
TOTAL ASSETS	30,029	30,486
CURRENT LIABILITIES
Fiduciary liabilities	12,224	12,214
Short-term debt and current portion of long-term debt	802	452
Accounts payable and accrued liabilities	1,440	1,853
Other current liabilities	795	831
Total Current Liabilities	15,261	15,350
Long-term debt	3,770	3,713
Pension, other post-retirement and other post-employment liabilities	2,027	2,276
Other non-current liabilities	1,338	1,342
TOTAL LIABILITIES	22,396	22,681
EQUITY
Ordinary shares - $0.01 nominal value Authorized: 750 shares (issued: 2013 - 309.1; 2012 - 310.9)	3	3
Additional paid-in capital	4,507	4,436
Retained earnings	5,844	5,933
Accumulated other comprehensive loss	(2,775)	(2,610)
TOTAL AON SHAREHOLDERS’ EQUITY	7,579	7,762
Noncontrolling interests	54	43
TOTAL EQUITY	7,633	7,805
TOTAL LIABILITIES AND EQUITY	$ 30,029	$ 30,486