Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Revenues:
Net premiums, principally supplemental health insurance		$ 4,380	$ 4,841	$ 13,176		$ 14,583
Net investment income		784	841	2,343		2,511
Realized investment gains (losses):
Other-than-temporary impairment losses realized	[1]	(137)	0	(143)		(31)
Sales and redemptions		26	33	186		171
Derivative and other gains (losses)		(3)	(17)	(17)		(68)
Total realized investment gains (losses)		(114)	16	26		72
Other income (loss)		(10)	38	8		48
Total revenues		5,040	5,736	15,553		17,214
Benefits and expenses:
Benefits and claims, net		2,927	3,355	8,816		9,868
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		258	271	790		841
Insurance commissions		326	361	981		1,096
Insurance expenses		554	566	1,634		1,637
Interest expense		67	77	224		238
Other expenses		44	32	356	[2]	118
Total acquisition and operating expenses		1,249	1,307	3,985		3,930
Total benefits and expenses		4,176	4,662	12,801		13,798
Earnings before income taxes		864	1,074	2,752		3,416
Income taxes		297	368	949		1,168
Net earnings		$ 567	$ 706	$ 1,803		$ 2,248
Net earnings per share:
Basic (in dollars per share)		$ 1.32	$ 1.56	$ 4.17		$ 4.96
Diluted (in dollars per share)		$ 1.32	$ 1.56	$ 4.14		$ 4.93
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		428,735	451,246	432,540		452,833
Diluted (in shares)		431,102	453,981	435,064		455,674
Cash dividends per share		$ 0.39	$ 0.37	$ 1.17		$ 1.11
8.50% senior notes due May 2019
Extinguishment of debt, make-whole premium				$ 230

[1] Includes $6 and $0 for the three-month periods and $12 and $31 for the nine-month periods ended September 30, 2015 and 2014, respectively, from change in intent to sell securities; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairment

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