Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 5,876	$ 5,379	$ 11,800	$ 10,928
Expense:
Compensation and benefits	3,337	3,010	6,544	6,110
Other operating expenses	1,082	1,005	2,073	2,009
Operating expenses	4,419	4,015	8,617	8,119
Operating income	1,457	1,364	3,183	2,809
Other net benefit credits	60	59	118	121
Interest income	10	1	24	2
Interest expense	(146)	(114)	(282)	(224)
Investment income	3	2	5	28
Income before income taxes	1,384	1,312	3,048	2,736
Income tax expense	337	334	749	672
Net income before non-controlling interests	1,047	978	2,299	2,064
Less: Net income attributable to non-controlling interests	12	11	29	26
Net income attributable to the Company	$ 1,035	$ 967	$ 2,270	$ 2,038
Net income per share attributable to the Company:
Basic (in dollars per share)	$ 2.09	$ 1.93	$ 4.59	$ 4.06
Diluted (in dollars per share)	$ 2.07	$ 1.91	$ 4.55	$ 4.01
Average number of shares outstanding:
Basic (in shares)	495	501	495	502
Diluted (in shares)	499	506	499	508
Shares outstanding (in shares)	494	499	494	499