Consolidated Statements of Earnings (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues:
Net Premiums, principally supplemental health insurance	$ 19,072		$ 20,135		$ 22,148
Net investment income	3,319		3,293		3,473
Realized investment gains (losses):
Other-than-temporary impairment losses realized	(31)	[1]	(199)	[1]	(977)	[1]
Sales and redemptions	215		262		474
Derivative and other gains (losses)	31		336		154
Total realized investment gains (losses)	215		399		(349)
Other income	122		112		92
Total revenues	22,728		23,939		25,364
Benefits and expenses:
Benefits and claims, net	12,937		13,813		15,330
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs	1,108		1,074		1,117
Insurance commissions	1,436		1,528		1,744
Insurance expenses	2,261		2,222		2,415
Interest expense	317		293		261
Other operating expenses	178		193		195
Total acquisition and operating expenses	5,300		5,310		5,732
Total benefits and expenses	18,237		19,123		21,062
Earnings before income taxes	4,491		4,816		4,302
Income Tax Expense:
Current	1,079		1,236		816
Deferred	461		422		620
Total income tax expense	1,540		1,658		1,436
Net earnings	$ 2,951		$ 3,158		$ 2,866
Net earnings per share:
Basic (in dollars per share)	$ 6.54		$ 6.80		$ 6.14
Diluted (in dollars per share)	$ 6.50		$ 6.76		$ 6.11
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)	451,204		464,502		466,868
Diluted (in shares)	454,000		467,408		469,287

[1] Includes $45 and $597 for the years ended December 31, 2013 and 2012, respectively, for credit-related impairments; $26 and $27 for the years ended December 31, 2013 and 2012, respectively, for impairments due to severity and duration of decline in fair value; and $31, $128 and $353 for the years ended December 31, 2014, 2013 and 2012, respectively, from change in intent to sell securities