Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue
Commissions, fees and other	$ 11,661	$ 12,019	$ 11,787
Fiduciary investment income	21	26	28
Total revenue	11,682	12,045	11,815
Expenses
Compensation and benefits	6,837	7,014	6,945
Other general expenses	2,997	3,065	3,199
Total operating expenses	9,834	10,079	10,144
Operating income	1,848	1,966	1,671
Interest income	14	10	9
Interest expense	(273)	(255)	(210)
Other income	100	44	68
Income before income taxes	1,689	1,765	1,538
Income taxes	267	334	390
Net income	1,422	1,431	1,148
Less: Net income attributable to noncontrolling interests	37	34	35
Net income attributable to Aon shareholders	$ 1,385	$ 1,397	$ 1,113
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 4.93	$ 4.73	$ 3.57
Diluted net income per share attributable to Aon shareholders (in dollars per share)	4.88	4.66	3.53
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 1.15	$ 0.92	$ 0.68
Weighted average ordinary shares outstanding - basic (in shares)	280.8	295.5	311.4
Weighted average ordinary shares outstanding - diluted (in shares)	283.8	299.6	315.4