Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue
Total revenue	$ 3,670	$ 3,525
Expenses
Compensation and benefits	1,767	1,719
Information technology	123	114
Premises	72	77
Depreciation of fixed assets	38	41
Amortization and impairment of intangible assets	28	40
Other general expense	275	289
Total operating expenses	2,303	2,280
Operating income	1,367	1,245
Interest income	3	3
Interest expense	(91)	(79)
Other income (expense)	25	(2)
Income before income taxes	1,304	1,167
Income tax expense	256	234
Net income	1,048	933
Less: Net income attributable to noncontrolling interests	25	20
Net income attributable to Aon shareholders	$ 1,023	$ 913
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 4.75	$ 4.02
Diluted net income per share attributable to Aon shareholders (in dollars per share)	$ 4.73	$ 4.00
Weighted average ordinary shares outstanding - basic (in shares)	215.3	227.1
Weighted average ordinary shares outstanding - diluted (in shares)	216.4	228.1