Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue
Total revenue	$ 3,143	$ 3,090
Expenses
Compensation and benefits	1,584	1,616
Information technology	117	115
Premises	87	93
Depreciation of fixed assets	40	39
Amortization and impairment of intangible assets	97	110
Other general expenses	346	318
Total operating expenses	2,271	2,291
Operating income	872	799
Interest income	2	4
Interest expense	(72)	(70)
Other income (expense)	0	(15)
Income from continuing operations before income taxes	802	718
Income taxes	126	114
Net income from continuing operations	676	604
Net income from discontinued operations	0	6
Net income	676	610
Less: Net income attributable to noncontrolling interests	17	16
Net income attributable to Aon shareholders	$ 659	$ 594
Basic net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	$ 2.72	$ 2.37
Discontinued operations (in dollars per share)	0	0.02
Net income (in dollars per share)	2.72	2.39
Diluted net income per share attributable to Aon shareholders
Continuing operations (in dollars per share)	2.70	2.35
Discontinued operations (in dollars per share)	0	0.02
Net income (in dollars per share)	$ 2.70	$ 2.37
Weighted average ordinary shares outstanding - basic (in shares)	242.2	248.5
Weighted average ordinary shares outstanding - diluted (in shares)	243.7	250.2