Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Premiums	$ 18,904	$ 15,712	$ 55,822	$ 47,139
Services	457	393	1,331	1,103
Investment income	714	136	940	351
Total revenues	20,075	16,241	58,093	48,593
Operating expenses:
Benefits	15,611	13,357	45,415	40,168
Operating costs	2,513	1,889	6,984	5,252
Depreciation and amortization	128	127	362	343
Total operating expenses	18,252	15,373	52,761	45,763
Income from operations	1,823	868	5,332	2,830
Interest expense	75	62	211	184
Other (income) expense, net	(7)	(82)	63	(217)
Income before income taxes and equity in net earnings	1,755	888	5,058	2,863
Provision for income taxes	450	200	1,485	684
Equity in net earnings	35	1	68	16
Net income	$ 1,340	$ 689	$ 3,641	$ 2,195
Basic earnings per common share (in dollars per share)	$ 10.12	$ 5.16	$ 27.53	$ 16.31
Diluted earnings per common share (in dollars per share)	$ 10.05	$ 5.14	$ 27.37	$ 16.24
Services revenue, type	us-gaap:HealthCareService	us-gaap:HealthCareService	us-gaap:HealthCareService	us-gaap:HealthCareService