Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net premiums, principally supplemental health insurance	$ 4,665	$ 4,823	$ 9,303	$ 9,425
Net investment income	802	822	1,596	1,623
Realized investment gains (losses):
Other-than-temporary impairment losses realized	(9)	(33)	(19)	(47)
Sales and redemptions	5	22	(1)	113
Derivative and other gains (losses)	(52)	(212)	(176)	(260)
Total realized investment gains (losses)	(56)	(223)	(196)	(194)
Other income (loss)	17	15	34	34
Total revenues	5,428	5,437	10,737	10,888
Benefits and expenses:
Benefits and claims, net	3,039	3,254	6,091	6,279
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs	283	284	577	576
Insurance commissions	335	345	664	678
Insurance and other expenses	665	654	1,339	1,273
Interest expense	61	66	122	131
Total acquisition and operating expenses	1,344	1,349	2,702	2,658
Total benefits and expenses	4,383	4,603	8,793	8,937
Earnings before income taxes	1,045	834	1,944	1,951
Income taxes	332	286	639	672
Net earnings	$ 713	$ 548	$ 1,305	$ 1,279
Net earnings per share:
Basic (in dollars per share)	$ 1.80	$ 1.33	$ 3.27	$ 3.08
Diluted (in dollars per share)	$ 1.79	$ 1.32	$ 3.25	$ 3.06
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)	396,433	411,853	398,768	415,301
Diluted (in shares)	399,348	414,326	401,695	417,623
Cash dividends per share	$ 0.43	$ 0.41	$ 0.86	$ 0.82