Condensed Consolidated Statements of Financial Position (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
CURRENT ASSETS
Cash and cash equivalents	$ 290	$ 272
Short-term investments	718	785
Receivables, net	2,959	3,183
Fiduciary assets	11,343	10,838
Other current assets	392	427
Total Current Assets	15,702	15,505
Goodwill	8,856	8,770
Intangible assets, net	3,040	3,276
Fixed assets, net	814	783
Investments	160	239
Other non-current assets	937	979
TOTAL ASSETS	29,509	29,552
CURRENT LIABILITIES
Fiduciary liabilities	11,343	10,838
Short-term debt and current portion of long-term debt	291	337
Accounts payable and accrued liabilities	1,519	1,832
Other current liabilities	801	753
Total Current Liabilities	13,954	13,760
Long-term debt	4,111	4,155
Pension, other post retirement and other post employment liabilities	1,757	2,192
Other non-current liabilities	1,326	1,325
TOTAL LIABILITIES	21,148	21,432
EQUITY
Ordinary shares (2012 - $0.01 nominal value; 2011 - $1.00 par value) Authorized: 750 shares (issued: 2012 - 318.7; 2011 - 386.4)	3	386
Additional paid-in capital	4,373	4,021
Retained earnings	6,179	8,594
Treasury shares at cost (shares: 2012 - 0; 2011 - 59.6)		(2,553)
Accumulated other comprehensive loss	(2,250)	(2,370)
TOTAL AON SHARESHOLDERS' EQUITY	8,305	8,078
Noncontrolling interests	56	42
TOTAL EQUITY	8,361	8,120
TOTAL LIABILITIES AND EQUITY	$ 29,509	$ 29,552