Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Premiums	$ 20,124	$ 18,362
Services	466	424
Investment income	78	149
Total revenues	20,668	18,935
Operating expenses:
Benefits	17,296	15,629
Operating costs	2,007	2,117
Depreciation and amortization	142	115
Total operating expenses	19,445	17,861
Income from operations	1,223	1,074
Interest expense	68	60
Other expense, net	115	297
Income before income taxes and equity in net earnings	1,040	717
Provision for income taxes	233	252
Equity in net earnings	21	8
Net income	$ 828	$ 473
Basic earnings per common share (in dollars per share)	$ 6.42	$ 3.58
Diluted earnings per common share (in dollars per share)	$ 6.39	$ 3.56
Services revenue, type	us-gaap:HealthCareMember	us-gaap:HealthCareMember