Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Net premiums, principally supplemental health insurance		$ 18,622	$ 18,780	$ 18,677
Net investment income		3,638	3,578	3,442
Net investment gains (losses)		(270)	(135)	(430)
Other income (loss)		157	84	69
Total revenues		22,147	22,307	21,758
Benefits and expenses:
Benefits and claims, net		11,796	11,942	12,000
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		1,214	1,282	1,245
Insurance commissions		1,316	1,321	1,320
Insurance and other expenses	[1]	3,420	3,089	2,988
Interest expense		242	228	222
Total acquisition and operating expenses		6,192	5,920	5,775
Total benefits and expenses		17,988	17,862	17,775
Earnings before income taxes		4,159	4,445	3,983
Income Tax Expense:
Current		794	806	1,379
Deferred		(1,413)	335	(316)
Total income tax expense		(619)	1,141	1,063
Net earnings		$ 4,778	$ 3,304	$ 2,920
Net earnings per share:
Basic (in dollars per share)		$ 6.69	$ 4.45	$ 3.79
Diluted (in dollars per share)		$ 6.67	$ 4.43	$ 3.77
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		713,702	742,414	769,588
Diluted (in shares)		716,192	746,430	774,650

[1] Includes expense of $15 in 2020 for the early extinguishment of debt