Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Net premiums, principally supplemental health insurance	$ 4,648	$ 5,022	$ 13,951	$ 14,447
Net investment income	811	842	2,408	2,465
Realized investment gains (losses):
Other-than-temporary impairment losses realized	(8)	(23)	(27)	(71)
Sales and redemptions	61	(14)	60	100
Derivative and other gains (losses)	(23)	(127)	(199)	(387)
Total realized investment gains (losses)	30	(164)	(166)	(358)
Other income (loss)	17	16	50	50
Total revenues	5,506	5,716	16,243	16,604
Benefits and expenses:
Benefits and claims, net	3,083	3,378	9,174	9,657
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs	271	282	848	858
Insurance commissions	332	353	996	1,031
Insurance and other expenses	686	675	2,025	1,948
Interest expense	59	65	181	196
Total acquisition and operating expenses	1,348	1,375	4,050	4,033
Total benefits and expenses	4,431	4,753	13,224	13,690
Earnings before income taxes	1,075	963	3,019	2,914
Income taxes	359	334	998	1,006
Net earnings	$ 716	$ 629	$ 2,021	$ 1,908
Net earnings per share:
Basic (in dollars per share)	$ 1.81	$ 1.54	$ 5.09	$ 4.62
Diluted (in dollars per share)	$ 1.80	$ 1.53	$ 5.05	$ 4.59
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)	394,479	408,519	397,323	413,023
Diluted (in shares)	397,381	411,140	400,241	415,446
Cash dividends per share	$ 0.43	$ 0.41	$ 1.29	$ 1.23