Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenue
Commissions, fees and other	$ 2,842		$ 2,941
Fiduciary investment income	5		6
Total revenue	2,847		2,947
Expenses
Compensation and benefits	1,683		1,751
Other general expenses	723		727
Total operating expenses	2,406		2,478
Operating income	441		469
Interest income	3		2
Interest expense	(65)		(58)
Other income	42		1
Income before income taxes	421		414
Income taxes	80		78
Net income	341		336
Less: Net income attributable to noncontrolling interests	13		11
Net income attributable to Aon shareholders	$ 328		$ 325
Basic net income per share attributable to Aon shareholders	$ 1.15		$ 1.07
Diluted net income per share attributable to Aon shareholders	$ 1.14		$ 1.06
Cash dividends per share paid on ordinary shares	$ 0.25		$ 0.18
Weighted average ordinary shares outstanding - basic (in shares)	284.2	[1]	303.5	[1]
Weighted average ordinary shares outstanding - diluted (in shares)	287.1		307.2

[1] Includes 2.5 million and 3.4 million of participating securities for the three months ended March 31, 2015 and 2014, respectively.