Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015		Jun. 30, 2016	Jun. 30, 2015
Revenues:
Net premiums, principally supplemental health insurance		$ 4,823	$ 4,364		$ 9,425	$ 8,796
Net investment income		822	777		1,623	1,559
Realized investment gains (losses):
Other-than-temporary impairment losses realized	[1]	(33)	0		(47)	(6)
Sales and redemptions		13	92		104	160
Derivative and other gains (losses)		(167)	35		(171)	(14)
Total realized investment gains (losses)		(187)	127		(114)	140
Other income (loss)		(21)	19		(46)	18
Total revenues		5,437	5,287		10,888	10,513
Benefits and expenses:
Benefits and claims, net		3,254	2,937		6,279	5,889
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		284	255		576	532
Insurance commissions		345	325		678	655
Insurance expenses		613	550		1,176	1,080
Interest expense		66	74		131	157
Other expenses		41	272	[2]	97	313	[2]
Total acquisition and operating expenses		1,349	1,476		2,658	2,737
Total benefits and expenses		4,603	4,413		8,937	8,626
Earnings before income taxes		834	874		1,951	1,887
Income taxes		286	301		672	651
Net earnings		$ 548	$ 573		$ 1,279	$ 1,236
Net earnings per share:
Basic (in dollars per share)		$ 1.33	$ 1.33		$ 3.08	$ 2.84
Diluted (in dollars per share)		$ 1.32	$ 1.32		$ 3.06	$ 2.83
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		411,853	431,672		415,301	434,473
Diluted (in shares)		414,326	434,257		417,623	437,077
Cash dividends per share		$ 0.41	$ 0.39		$ 0.82	$ 0.78
8.50% senior notes due May 2019
Extinguishment of debt, make-whole premium			$ 230			$ 230

[1] Includes $33 and an immaterial amount for the three-month periods and $47 and $6 for the six-month periods ended June 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery

[2] Includes expense of $230 for the make-whole payment associated with the early extinguishment of debt