Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Insurance premiums	$ 3,256	$ 2,987	$ 3,246
Fee income	5,619	5,244	5,045
Net investment income	4,990	4,874	4,827
Realized gain (loss):
Total other-than-temporary impairment losses on securities	(18)	(145)	(80)
Portion of loss recognized in other comprehensive income		43	26
Net other-than-temporary impairment losses on securities recognized in earnings	(18)	(102)	(54)
Realized gain (loss), excluding other-than-temporary impairment losses on securities	(152)	(237)	(97)
Total realized gain (loss)	(170)	(339)	(151)
Amortization of deferred gain on business sold through reinsurance	23	73	74
Other revenues	539	491	531
Total revenues	14,257	13,330	13,572
Expenses
Interest credited	2,590	2,564	2,508
Benefits	5,160	4,692	5,044
Commissions and other expenses	4,176	4,277	4,318
Interest and debt expense	253	331	272
Strategic digitization expense	43	8
Impairment of intangibles	905
Total expenses	13,127	11,872	12,142
Income (loss) before taxes	1,130	1,458	1,430
Federal income tax expense (benefit)	(949)	266	276
Net income (loss)	2,079	1,192	1,154
Unrealized investment gains (losses)	1,643	709	(2,229)
Foreign currency translation adjustment	13	(22)	(2)
Funded status of employee benefit plans	8	34	(20)
Total other comprehensive income (loss), net of tax	1,664	721	(2,251)
Comprehensive income (loss)	$ 3,743	$ 1,913	$ (1,097)
Net Income (Loss) Per Common Share
Basic (in dollars per share)	$ 9.36	$ 5.09	$ 4.60
Diluted (in dollars per share)	9.22	5.03	4.51
Cash dividends declared per common share	$ 1.20	$ 1.04	$ 0.85