Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

Selected quarterly financial data for the years ended December 31, 2014 and 2013 are as follows (in millions, except per share data):

	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

	1Q		2Q		3Q		4Q		2013
INCOME STATEMENT DATA
Commissions, fees and other revenue	$	2,908	$	2,891	$	2,786	$	3,202	$	11,787
Fiduciary investment income	7		6		8		7		28
Total revenue	$	2,915	$	2,897	$	2,794	$	3,209	$	11,815
Operating income	$	410	$	382	$	364	$	515	$	1,671
Net income	272		252		264		360		1,148
Less: Net income attributable to noncontrolling interests	11		11		8		5		35
Net income attributable to Aon shareholders	$	261	$	241	$	256	$	355	$	1,113
PER SHARE DATA
Basic net income per share attributable to Aon shareholders	$	0.82	$	0.77	$	0.83	$	1.16	$	3.57
Diluted net income per share attributable to Aon shareholders	$	0.82	$	0.76	$	0.82	$	1.14	$	3.53
CLASS A ORDINARY SHARE DATA
Dividends paid per share	$	0.16	$	0.18	$	0.18	$	0.18	$	0.68
Price range:
High	$	61.87	$	67.26	$	76.30	$	84.33	$	84.33
Low	$	54.65	$	58.48	$	64.20	$	70.72	$	54.65
Shares outstanding	309.1		307.5		301.0		300.7		300.7
Average monthly trading volume	46.4		34.9		30.9		37.6		37.5