Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Net premiums, principally supplemental health insurance		$ 5,022	$ 4,380	$ 14,447	$ 13,176
Net investment income		842	784	2,465	2,343
Realized investment gains (losses):
Other-than-temporary impairment losses realized	[1]	(22)	(137)	(69)	(143)
Sales and redemptions		(17)	26	87	186
Derivative and other gains (losses)		(107)	(3)	(278)	(17)
Total realized investment gains (losses)		(146)	(114)	(260)	26
Other income (loss)		(2)	(10)	(48)	8
Total revenues		5,716	5,040	16,604	15,553
Benefits and expenses:
Benefits and claims, net		3,378	2,927	9,657	8,816
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		282	258	858	790
Insurance commissions		353	326	1,031	981
Insurance expenses		625	554	1,801	1,634
Interest expense		65	67	196	224
Other expenses		50	44	147	356	[2]
Total acquisition and operating expenses		1,375	1,249	4,033	3,985
Total benefits and expenses		4,753	4,176	13,690	12,801
Earnings before income taxes		963	864	2,914	2,752
Income taxes		334	297	1,006	949
Net earnings		$ 629	$ 567	$ 1,908	$ 1,803
Net earnings per share:
Basic (in dollars per share)		$ 1.54	$ 1.32	$ 4.62	$ 4.17
Diluted (in dollars per share)		$ 1.53	$ 1.32	$ 4.59	$ 4.14
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		408,519	428,735	413,023	432,540
Diluted (in shares)		411,140	431,102	415,446	435,064
Cash dividends per share		$ 0.41	$ 0.39	$ 1.23	$ 1.17
8.50% senior notes due May 2019
Extinguishment of debt, make-whole premium					$ 230

[1] Includes $22 and $6 for the three-month periods and $69 and $12 for the nine-month periods ended September 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairments

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