Consolidated Statements of Earnings (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Revenues:
Premiums, principally supplemental health insurance	$ 5,660		$ 5,210		$ 16,505		$ 15,037
Net investment income	869		843		2,597		2,422
Realized investment gains (losses):
Other-than-temporary impairment losses realized	(97)	[1]	(166)	[2]	(643)	[1]	(1,100)	[2]
Sales and redemptions	288		307		358		49
Derivative and other gains (losses)	95		(224)		108		(279)
Total realized investment gains (losses)	286		(83)		(177)		(1,330)
Other income	32		17		64		63
Total revenues	6,847		5,987		18,989		16,192
Benefits and expenses:
Benefits and claims	3,932		3,517		11,341		10,049
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs	281		264		838		775
Insurance commissions	442		438		1,309		1,287
Insurance expenses	595		579		1,745		1,678
Interest expense	67		52		186		143
Other operating expenses	50		45		147		131
Total acquisition and operating expenses	1,435		1,378		4,225		4,014
Total benefits and expenses	5,367		4,895		15,566		14,063
Earnings before income taxes	1,480		1,092		3,423		2,129
Income taxes	463		356		1,138		730
Net earnings	$ 1,017		$ 736		$ 2,285		$ 1,399
Net earnings per share:
Basic	$ 2.17		$ 1.58		$ 4.90		$ 3.00
Diluted	$ 2.16		$ 1.57		$ 4.87		$ 2.98
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic	467,422		465,910		466,702		466,843
Diluted	469,721		467,793		468,951		469,919
Cash dividends per share	$ 0.33		$ 0.30		$ 0.99		$ 0.90

[1] Includes $70 and $365 for the three- and nine-month periods ended September 30, 2012, respectively, for credit-related impairments; $0 and $251 for the three- and nine-month periods ended September 30, 2012, respectively, from change in intent to sell securities; and $27 for the three- and nine-month periods ended September 30, 2012 for impairments due to severity and duration of decline in fair value

[2] Consisted completely of credit-related impairments