Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue
Commissions, fees and other	$ 2,787	$ 2,842
Fiduciary investment income	5	5
Total revenue	2,792	2,847
Expenses
Compensation and benefits	1,649	1,683
Other general expenses	693	723
Total operating expenses	2,342	2,406
Operating income	450	441
Interest income	2	3
Interest expense	(69)	(65)
Other income	18	42
Income before income taxes	401	421
Income taxes	74	80
Net income	327	341
Less: Net income attributable to noncontrolling interests	12	13
Net income attributable to Aon shareholders	$ 315	$ 328
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 1.16	$ 1.15
Diluted net income per share attributable to Aon shareholders (in dollars per share)	1.15	1.14
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.30	$ 0.25
Weighted average ordinary shares outstanding - basic (in shares)	271.7	284.2
Weighted average ordinary shares outstanding - diluted (in shares)	273.7	287.1