Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenue	$ 5,924	$ 5,549
Expense:
Compensation and benefits	3,207	3,100
Other operating expenses	991	1,004
Operating expenses	4,198	4,104
Operating income	1,726	1,445
Other net benefit credits	58	62
Interest income	14	1
Interest expense	(136)	(110)
Investment income	2	26
Income before income taxes	1,664	1,424
Income tax expense	412	338
Net income before non-controlling interests	1,252	1,086
Less: Net income attributable to non-controlling interests	17	15
Net income attributable to the Company	$ 1,235	$ 1,071
Net income per share attributable to the Company:
Basic (in dollars per share)	$ 2.50	$ 2.13
Diluted (in dollars per share)	$ 2.47	$ 2.10
Average number of shares outstanding:
Basic (in shares)	495	503
Diluted (in shares)	500	509
Shares outstanding (in shares)	495	502