Federal Income Taxes (Significant Components Of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Future contract benefits and other contract holder funds	$ 1,286	$ 1,494
Deferred gain on business sold through reinsurance	8	35
Reinsurance related embedded derivative asset	19	31
Compensation and benefit plans	309	265
Net operating loss carryforwards		12
Tax credits	85	33
Other	133	205
Total deferred tax assets	1,840	2,075
Deferred Tax Liabilities
DAC	1,986	2,064
VOBA	312	313
Net unrealized gain on AFS securities	1,646	1,116
Net unrealized gain on trading securities	68	70
Intangibles	20	117
Investment activity	108	105
Other	163	157
Total deferred tax liabilities	4,303	3,942
Net deferred tax asset (liability)	$ (2,463)	$ (1,867)