Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 286	$ 272
Short-term investments	516	785
Receivables, net	3,075	3,183
Fiduciary assets	12,736	10,838
Other current assets	443	427
Total Current Assets	17,056	15,505
Goodwill	8,713	8,770
Intangible assets, net	3,106	3,276
Fixed assets, net	797	783
Investments	200	239
Other non-current assets	935	979
TOTAL ASSETS	30,807	29,552
CURRENT LIABILITIES
Fiduciary liabilities	12,736	10,838
Short-term debt and current portion of long-term debt	392	337
Accounts payable and accrued liabilities	1,339	1,832
Other current liabilities	733	753
Total Current Liabilities	15,200	13,760
Long-term debt	4,098	4,155
Pension and other post employment liabilities	1,967	2,192
Other non-current liabilities	1,332	1,325
TOTAL LIABILITIES	22,597	21,432
EQUITY
Ordinary shares (2012 - $0.01 nominal value; 2011 - $1.00 par value) Authorized: 750 shares (issued: 2012 - 322.4; 2011 - 386.4)	3	386
Additional paid-in capital	4,279	4,021
Retained earnings	6,302	8,594
Treasury shares at cost (shares: 2012 - 0; 2011 - 59.6)		(2,553)
Accumulated other comprehensive loss	(2,432)	(2,370)
TOTAL AON SHAREHOLDERS' EQUITY	8,152	8,078
Noncontrolling interests	58	42
TOTAL EQUITY	8,210	8,120
TOTAL LIABILITIES AND EQUITY	$ 30,807	$ 29,552