Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue
Commissions, fees and other	$ 2,799	$ 1,883	$ 5,547	$ 3,774
Fiduciary investment income	12	15	23	28
Total revenue	2,811	1,898	5,570	3,802
Expenses
Compensation and benefits	1,612	1,169	3,209	2,332
Other general expenses	765	461	1,531	929
Total operating expenses	2,377	1,630	4,740	3,261
Operating income	434	268	830	541
Interest income	4	4	10	5
Interest expense	(63)	(33)	(126)	(67)
Other income (expense)	(23)	5	(6)	12
Income from continuing operations before income taxes	352	244	708	491
Income taxes	87	60	190	121
Income from continuing operations	265	184	518	370
Income (loss) from discontinued operations before income taxes	1	(41)	5	(39)
Income taxes	(1)	(15)	1	(13)
Income (loss) from discontinued operations	2	(26)	4	(26)
Net income	267	158	522	344
Less: Net income attributable to noncontrolling interests	9	5	18	13
Net income attributable to Aon stockholders	258	153	504	331
Net income (loss) attributable to Aon stockholders
Income from continuing operations	256	179	500	357
Income (loss) from discontinued operations	2	(26)	4	(26)
Net income	$ 258	$ 153	$ 504	$ 331
Basic net income (loss) per share attributable to Aon stockholders
Continuing operations (in dollars per share)	$ 0.76	$ 0.64	$ 1.48	$ 1.29
Discontinued operations (in dollars per share)		$ (0.09)	$ 0.01	$ (0.10)
Net income (in dollars per share)	$ 0.76	$ 0.55	$ 1.49	$ 1.19
Diluted net income (loss) per share attributable to Aon stockholders
Continuing operations (in dollars per share)	$ 0.75	$ 0.63	$ 1.45	$ 1.27
Discontinued operations (in dollars per share)		$ (0.09)	$ 0.01	$ (0.09)
Net income (in dollars per share)	$ 0.75	$ 0.54	$ 1.46	$ 1.18
Cash dividends per share paid on common stock (in dollars per share)	$ 0.15	$ 0.15	$ 0.30	$ 0.30
Weighted average common shares outstanding - basic (in shares)	337.7	278.4	338.7	277.1
Weighted average common shares outstanding - diluted (in shares)	342.7	282.6	344.0	281.7

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8

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