Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 5,379	$ 5,017	$ 10,928	$ 10,100
Expense:
Compensation and benefits	3,010	2,860	6,110	5,667
Other operating expenses	1,005	929	2,009	1,847
Operating expenses	4,015	3,789	8,119	7,514
Operating income	1,364	1,228	2,809	2,586
Other net benefit credits	59	71	121	142
Interest income	1	1	2	1
Interest expense	(114)	(110)	(224)	(228)
Investment income	2	19	28	30
Income before income taxes	1,312	1,209	2,736	2,531
Income tax expense	334	382	672	706
Net income before non-controlling interests	978	827	2,064	1,825
Less: Net income attributable to non-controlling interests	11	7	26	22
Net income attributable to the Company	$ 967	$ 820	$ 2,038	$ 1,803
Net income per share attributable to the Company:
Basic (usd per share)	$ 1.93	$ 1.61	$ 4.06	$ 3.55
Diluted (usd per share)	$ 1.91	$ 1.60	$ 4.01	$ 3.51
Average number of shares outstanding:
Basic (in shares)	501	508	502	508
Diluted (in shares)	506	513	508	514
Shares outstanding (in shares)	499	507	499	507