Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 19,820	$ 17,224	$ 16,652
Expense:
Compensation and benefits	11,425	10,129	9,734
Other operating expenses	4,083	4,029	4,241
Operating expenses	15,508	14,158	13,975
Operating income	4,312	3,066	2,677
Other net benefits credits	277	257	265
Interest income	2	7	39
Interest expense	(444)	(515)	(524)
Cost of extinguishment of debt	0	0	(32)
Investment income (loss)	61	(22)	22
Acquisition related derivative contracts	0	0	(8)
Income before income taxes	4,208	2,793	2,439
Income tax expense	1,034	747	666
Net income before non-controlling interests	3,174	2,046	1,773
Less: Net income attributable to non-controlling interests	31	30	31
Net income attributable to the Company	$ 3,143	$ 2,016	$ 1,742
Net income per share attributable to the Company
Basic (in dollars per share)	$ 6.20	$ 3.98	$ 3.44
Diluted (in dollars per share)	$ 6.13	$ 3.94	$ 3.41
Average number of shares outstanding
Basic (in shares)	507	506	506
Diluted (in shares)	513	512	511
Shares outstanding (in shares)	504	508	504