Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums, principally supplemental health insurance		$ 4,745	$ 4,638
Net investment income		837	794
Realized investment gains (losses):
Other-than-temporary impairment losses realized		(7)	(10)
Other gains (losses)	[1]	(127)	(130)
Total realized investment gains (losses)		(134)	(140)
Other income (loss)		16	17
Total revenues		5,464	5,309
Benefits and expenses:
Benefits and claims, net		3,042	3,052
Acquisition and operating expenses:
Amortization of deferred policy acquisition costs		314	294
Insurance commissions		337	328
Insurance and other expenses		733	675
Interest expense		56	62
Total acquisition and operating expenses		1,440	1,359
Total benefits and expenses		4,482	4,411
Earnings before income taxes		982	898
Income taxes		265	306
Net earnings		$ 717	$ 592
Net earnings per share:
Basic (in dollars per share)		$ 0.92	$ 0.74
Diluted (in dollars per share)		$ 0.91	$ 0.73
Weighted-average outstanding common shares used in computing earnings per share (In thousands):
Basic (in shares)		778,550	802,259
Diluted (in shares)		783,852	808,138
Cash dividends per share		$ 0.26	$ 0.22

[1] See Note 1 of the Notes to the Consolidated Financial Statements for the adoption of accounting guidance on January 1, 2018 related to financial instruments.