Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

Selected quarterly financial data for the years ended December 31, 2015 and 2014 are as follows (in millions, except per share data):

	1Q		2Q		3Q		4Q		2015
INCOME STATEMENT DATA
Commissions, fees and other revenue	$	2,842	$	2,800	$	2,736	$	3,283	$	11,661
Fiduciary investment income	5		5		6		5		21
Total revenue	$	2,847	$	2,805	$	2,742	$	3,288	$	11,682
Operating income	$	441	$	277	$	413	717		$	1,848
Net income	341		188		303		590		1,422
Less: Net income attributable to noncontrolling interests	13		10		8		6		37
Net income attributable to Aon shareholders	$	328	$	178	$	295	$	584	$	1,385
PER SHARE DATA
Basic net income per share attributable to Aon shareholders	$	1.15	$	0.63	$	1.05	$	2.12	$	4.93
Diluted net income per share attributable to Aon shareholders	$	1.14	$	0.62	$	1.05	$	2.09	$	4.88
CLASS A ORDINARY SHARE DATA
Dividends paid per share	$	0.25	$	0.30	$	0.30	$	0.30	$	1.15
Price range:
High	$	107.08	$	104.70	$	103.38	$	97.79	$	107.08
Low	$	89.35	$	95.32	$	87.58	$	86.38	$	86.38
Shares outstanding	281.7		279.8		273.9		269.8		269.8
Average monthly trading volume	24.5		24.9		26.5		26.6		25.6

	1Q		2Q		3Q		4Q		2014
INCOME STATEMENT DATA
Commissions, fees and other revenue	$	2,941	$	2,913	$	2,873	$	3,292	$	12,019
Fiduciary investment income	6		6		7		7		26
Total revenue	$	2,947	$	2,919	$	2,880	$	3,299	$	12,045
Operating income	$	469	$	445	$	417	$	635	$	1,966
Net income	336		313		315		467		1,431
Less: Net income attributable to noncontrolling interests	11		9		6		8		34
Net income attributable to Aon shareholders	$	325	$	304	$	309	$	459	$	1,397
PER SHARE DATA
Basic net income per share attributable to Aon shareholders	$	1.07	$	1.02	$	1.06	$	1.60	$	4.73
Diluted net income per share attributable to Aon shareholders	$	1.06	$	1.01	$	1.04	$	1.56	$	4.66
CLASS A ORDINARY SHARE DATA
Dividends paid per share	$	0.18	$	0.25	$	0.25	$	0.25	$	0.92
Price range:
High	$	87.45	$	91.07	$	91.28	$	98.10	$	98.10
Low	$	76.49	$	78.60	$	83.06	$	78.26	$	76.49
Shares outstanding	296.5		290.5		285.1		280.0		280.0
Average monthly trading volume	32.6		28.5		26.3		34.1		30.4