Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 4,770	$ 4,583	$ 15,698	$ 14,683
Expense:
Compensation and benefits	2,923	2,853	9,033	8,520
Other operating expenses	1,056	990	3,065	2,837
Operating expenses	3,979	3,843	12,098	11,357
Operating income	791	740	3,600	3,326
Other net benefit credits	57	69	178	211
Interest income	4	1	6	2
Interest expense	(118)	(107)	(342)	(335)
Investment (loss) income	(1)	13	27	43
Income before income taxes	733	716	3,469	3,247
Income tax expense	181	174	853	880
Net income before non-controlling interests	552	542	2,616	2,367
Less: Net income attributable to non-controlling interests	6	5	32	27
Net income attributable to the Company	$ 546	$ 537	$ 2,584	$ 2,340
Net income per share attributable to the Company:
Basic (usd per share)	$ 1.10	$ 1.06	$ 5.16	$ 4.61
Diluted (usd per share)	$ 1.08	$ 1.05	$ 5.11	$ 4.56
Average number of shares outstanding:
Basic (in shares)	498	506	501	508
Diluted (in shares)	503	513	506	513
Shares outstanding (in shares)	497	505	497	505