Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 5,382	$ 4,770	$ 17,182	$ 15,698
Expense:
Compensation and benefits	3,287	2,923	9,831	9,033
Other operating expenses	1,099	1,056	3,172	3,065
Operating expenses	4,386	3,979	13,003	12,098
Operating income	996	791	4,179	3,600
Other net benefit credits	62	57	180	178
Interest income	16	4	40	6
Interest expense	(145)	(118)	(427)	(342)
Investment income (loss)	1	(1)	6	27
Income before income taxes	930	733	3,978	3,469
Income tax expense	192	181	941	853
Net income before non-controlling interests	738	552	3,037	2,616
Less: Net income attributable to non-controlling interests	8	6	37	32
Net income attributable to the Company	$ 730	$ 546	$ 3,000	$ 2,584
Net income per share attributable to the Company:
Basic (in dollars per share)	$ 1.48	$ 1.10	$ 6.07	$ 5.16
Diluted (in dollars per share)	$ 1.47	$ 1.08	$ 6.01	$ 5.11
Average number of shares outstanding:
Basic (in shares)	494	498	494	501
Diluted (in shares)	499	503	499	506
Shares outstanding (in shares)	493	497	493	497