Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

Selected quarterly financial data for the years ended December 31, 2019 and 2018 are as follows (in millions, except per share data):

	1Q		2Q		3Q			4Q		2019
Income Statement Data
Total revenue	$	3,143	$	2,606	$	2,379		$	2,885	$	11,013
Operating income	872		413		360			524		2,169
Net income from continuing operations	676		287		229			382		1,574
Income from discontinued operations, net of tax	—		—		(1		)	—		(1		)
Net income	676		287		228			382		1,573
Less: Net income attributable to noncontrolling interests	17		10		6			8		41
Net income attributable to Aon shareholders	$	659	$	277	$	222		$	374	$	1,532
Per Share Data
Basic net income per share attributable to Aon shareholders
Continuing operations	$	2.72	$	1.15	$	0.94		$	1.59	$	6.42
Discontinued operations	—		—		—			—		—
Net income	$	2.72	$	1.15	$	0.94		$	1.59	$	6.42
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	2.70	$	1.14	$	0.93		$	1.58	$	6.37
Discontinued operations	—		—		—			—		—
Net income	$	2.70	$	1.14	$	0.93		$	1.58	$	6.37

	1Q		2Q			3Q			4Q		2018
Income Statement Data
Total revenue	$	3,090	$	2,561		$	2,349		$	2,770	$	10,770
Operating income	799		(16		)	262			499		1,544
Net income from continuing operations	604		57			155			284		1,100
Income from discontinued operations, net of tax	6		1			(2		)	69		74
Net income	610		58			153			353		1,174
Less: Net income attributable to noncontrolling interests	16		10			6			8		40
Net income attributable to Aon shareholders	$	594	$	48		$	147		$	345	$	1,134
Per Share Data
Basic net income per share attributable to Aon shareholders
Continuing operations	$	2.37	$	0.19		$	0.61		$	1.14	$	4.32
Discontinued operations	0.02		0.01			(0.01		)	0.28		0.30
Net income	$	2.39	$	0.20		$	0.60		$	1.42	$	4.62
Diluted net income per share attributable to Aon shareholders
Continuing operations	$	2.35	$	0.19		$	0.61		$	1.13	$	4.29
Discontinued operations	0.02		—			(0.01		)	0.28		0.30
Net income	$	2.37	$	0.19		$	0.60		$	1.41	$	4.59