Federal Income Taxes (Significant Components Of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Future contract benefits and other contract holder funds	$ 795	$ 1,286
Deferred gain on business sold through reinsurance		8
Reinsurance related embedded derivative asset	12	19
Compensation and benefit plans	182	309
Tax credits	76	85
Other	7	133
Total deferred tax assets	1,072	1,840
Deferred Tax Liabilities
DAC	1,080	1,986
VOBA	108	312
Net unrealized gain on AFS securities	1,643	1,646
Net unrealized gain on trading securities	41	68
Intangibles	9	20
Investment activity	96	108
Other	190	163
Total deferred tax liabilities	3,167	4,303
Net deferred tax asset (liability)	$ (2,095)	$ (2,463)