Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Insurance premiums	$ 2,987	$ 3,246	$ 2,988
Fee income	5,244	5,045	4,673
Net investment income	4,874	4,827	4,859
Realized gain (loss):
Total other-than-temporary impairment losses on securities	(145)	(80)	(26)
Portion of loss recognized in other comprehensive income	43	26	10
Net other-than-temporary impairment losses on securities recognized in earnings	(102)	(54)	(16)
Realized gain (loss), excluding other-than-temporary impairment losses on securities	(237)	(97)	16
Total realized gain (loss)	(339)	(151)
Amortization of deferred gain on business sold through reinsurance	73	74	74
Other revenues	491	531	960
Total revenues	13,330	13,572	13,554
Expenses
Interest credited	2,564	2,508	2,532
Benefits	4,692	5,044	4,679
Commissions and other expenses	4,277	4,318	4,079
Interest and debt expense	331	272	267
Strategic digitization expense	8
Total expenses	11,872	12,142	11,557
Income (loss) from continuing operations before taxes	1,458	1,430	1,997
Federal income tax expense (benefit)	266	276	483
Income (loss) from continuing operations	1,192	1,154	1,514
Income (loss) from discontinued operations, net of federal income taxes			1
Net income (loss)	1,192	1,154	1,515
Unrealized investment gains (losses)	709	(2,229)	1,591
Foreign currency translation adjustment	(22)	(2)	2
Funded status of employee benefit plans	34	(20)	(60)
Total other comprehensive income (loss), net of tax	721	(2,251)	1,533
Comprehensive income (loss)	$ 1,913	$ (1,097)	$ 3,048
Net Income (Loss) Per Common Share - Basic
Income (loss) from continuing operations (in dollars per share)	$ 5.09	$ 4.60	$ 5.81
Income (loss) from discontinued operations (in dollars per share)
Net income (loss) (in dollars per share)	5.09	4.60	5.81
Net Income (Loss) Per Common Share - Diluted
Income (loss) from continuing operations (in dollars per share)	5.03	4.51	5.67
Income (loss) from discontinued operations (in dollars per share)
Net income (loss) (in dollars per share)	5.03	4.51	5.67
Cash dividends declared per common share	$ 1.04	$ 0.85	$ 0.68