Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue
Total revenue	$ 4,070	$ 3,871
Expenses
Compensation and benefits	1,883	1,792
Information technology	124	139
Premises	71	75
Depreciation of fixed assets	44	38
Amortization and impairment of intangible assets	16	25
Other general expense	348	329
Accelerating Aon United Program expenses	119	0
Total operating expenses	2,605	2,398
Operating income	1,465	1,473
Interest income	28	5
Interest expense	(144)	(111)
Other income (expense)	75	(25)
Income before income taxes	1,424	1,342
Income tax expense	331	263
Net income	1,093	1,079
Less: Net income attributable to noncontrolling interests	22	29
Net income attributable to Aon shareholders	$ 1,071	$ 1,050
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 5.38	$ 5.09
Diluted net income per share attributable to Aon shareholders (in dollars per share)	$ 5.35	$ 5.07
Weighted average ordinary shares outstanding - basic (in shares)	199.1	206.1
Weighted average ordinary shares outstanding - diluted (in shares)	200.1	207.1