Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Services revenue, type	Health Care [Member]	Health Care [Member]	Health Care [Member]
Revenues:
Premiums	$ 79,822	$ 74,186	$ 62,948
Services	3,055	1,815	1,439
Investment income	187	1,154	501
Total revenues	83,064	77,155	64,888
Operating expenses:
Benefits	69,199	61,628	53,857
Operating costs	10,121	10,052	7,381
Depreciation and amortization	596	489	458
Total operating expenses	79,916	72,169	61,696
Income (loss) from operations	3,148	4,986	3,192
Interest expense	326	283	242
Other (income) expense, net	(532)	103	(506)
Income before income taxes and equity in net earnings	3,354	4,600	3,456
Provision for income taxes	485	1,307	763
Equity in net earnings	65	74	14
Net income	2,934	3,367	2,707
Less: Net income attributable to noncontrolling interests	(1)	0	0
Net income (loss)	$ 2,933	$ 3,367	$ 2,707
Basic earnings per common share (in dollars per share)	$ 22.79	$ 25.47	$ 20.20
Diluted earnings per common share (in dollars per share)	$ 22.67	$ 25.31	$ 20.10