Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue
Total revenue	$ 3,871	$ 3,670
Expenses
Compensation and benefits	1,792	1,767
Information technology	139	123
Premises	75	72
Depreciation of fixed assets	38	38
Amortization and impairment of intangible assets	25	28
Other general expense	329	275
Total operating expenses	2,398	2,303
Operating income	1,473	1,367
Interest income	5	3
Interest expense	(111)	(91)
Other income (expense)	(25)	25
Income before income taxes	1,342	1,304
Income tax expense	263	256
Net income	1,079	1,048
Less: Net income attributable to noncontrolling interests	29	25
Net income attributable to Aon shareholders	$ 1,050	$ 1,023
Basic net income (loss) per share attributable to Aon shareholders (in dollars per share)	$ 5.09	$ 4.75
Diluted net income (loss) per share attributable to Aon shareholders (in dollars per share)	$ 5.07	$ 4.73
Weighted average ordinary shares outstanding - basic (in shares)	206.1	215.3
Weighted average ordinary shares outstanding - diluted (in shares)	207.1	216.4