Consolidated Statements of Earnings (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Revenues:
Premiums, principally supplemental health insurance	$ 5,013		$ 5,467		$ 10,197		$ 10,845
Net investment income	813		845		1,646		1,728
Realized investment gains (losses):
Other-than-temporary impairment losses realized	0	[1]	(343)	[1]	(55)	[1]	(546)	[1]
Sales and redemptions	86		(8)		205		70
Derivative and other gains (losses)	115		(67)		207		13
Total realized investment gains (losses)	201		(418)		357		(463)
Other income	17		8		52		32
Total revenues	6,044		5,902		12,252		12,142
Benefits and expenses:
Benefits and claims	3,411		3,763		6,932		7,409
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs	251		269		534		557
Insurance commissions	378		432		770		867
Insurance expenses	529		587		1,063		1,150
Interest expense	69		62		140		119
Other operating expenses	48		48		94		97
Total acquisition and operating expenses	1,275		1,398		2,601		2,790
Total benefits and expenses	4,686		5,161		9,533		10,199
Earnings before income taxes	1,358		741		2,719		1,943
Income taxes	469		258		938		675
Net earnings	$ 889		$ 483		$ 1,781		$ 1,268
Net earnings per share:
Basic	$ 1.91		$ 1.04		$ 3.82		$ 2.72
Diluted	$ 1.90		$ 1.03		$ 3.80		$ 2.71
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic	465,213		466,788		465,834		466,337
Diluted	467,975		468,590		468,546		468,561
Cash dividends per share	$ 0.35		$ 0.33		$ 0.70		$ 0.66

[1] Includes $0 and $267 for the three-month periods and $0 and $295 for the six-month periods ended June 30, 2013 and 2012, respectively, for credit-related impairments; $0 for the three-month period and $1 for the six-month period ended June 30, 2013 for impairments due to severity and duration of decline in fair value; and $0 and $76 for the three-month periods and $54 and $251 for the six-month periods ended June 30, 2013 and 2012, respectively, from change in intent to sell securities