Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Revenue
Commissions, fees and other	$ 2,941		$ 2,908
Fiduciary investment income	6		7
Total revenue	2,947		2,915
Expenses
Compensation and benefits	1,751		1,725
Other general expenses	727		780
Total operating expenses	2,478		2,505
Operating income	469		410
Interest income	2		1
Interest expense	(58)		(52)
Other income	1		9
Income before income taxes	414		368
Income taxes	78		96
Net income	336		272
Less: Net income attributable to noncontrolling interests	11		11
Net income attributable to Aon shareholders	$ 325		$ 261
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 1.07		$ 0.82
Diluted net income per share attributable to Aon shareholders (in dollars per share)	$ 1.06		$ 0.82
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.18		$ 0.16
Weighted average ordinary shares outstanding - basic	303.5	[1]	316.4	[1]
Weighted average ordinary shares outstanding - diluted	307.2		320.0

[1] Includes 3.4 million and 4.2 million of participating securities for the three months ended March 31, 2014 and 2013, respectively