Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue
Total revenue	$ 3,090	$ 2,381
Expenses
Compensation and benefits	1,616	1,469
Information technology	115	88
Premises	93	84
Depreciation of fixed assets	39	54
Amortization and impairment of intangible assets	110	43
Other general expenses	318	308
Total operating expenses	2,291	2,046
Operating income	799	335
Interest income	4	2
Interest expense	(70)	(70)
Other income (expense)	(15)	(2)
Income from continuing operations before income taxes	718	265
Income taxes	114	0
Net income from continuing operations	604	265
Net income from discontinued operations	6	40
Net income	610	305
Less: Net income attributable to noncontrolling interests	16	14
Net income attributable to Aon shareholders	$ 594	$ 291
Basic net income per share attributable to Aon shareholders
Basic net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share)	$ 2.37	$ 0.95
Basic net income (loss) per share attributable to Aon shareholders, discontinued operations (in dollars per share)	0.02	0.15
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	2.39	1.10
Diluted net income per share attributable to Aon shareholders
Diluted net income (loss) per share attributable to Aon shareholders, continuing operations (in dollars per share)	2.35	0.94
Diluted net income (loss) per share attributable to Aon shareholders, discontinued operations (in dollars per share)	0.02	0.15
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	2.37	1.09
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.36	$ 0.33
Weighted average ordinary shares outstanding - basic (in shares)	248.5	264.8
Weighted average ordinary shares outstanding - diluted (in shares)	250.2	267.0