Federal Income Taxes (Significant Components Of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets
Future contract benefits and other contract holder funds	$ 1,494	$ 1,167
Deferred gain on business sold through reinsurance	35	15
Reinsurance related embedded derivative asset	31	52
Investment activity		138
Compensation and benefit plans	265	321
Net operating loss carryforwards	12	17
Tax credits	33
Other	205	143
Total deferred tax assets	2,075	1,853
Deferred Tax Liabilities
DAC	2,064	1,605
VOBA	313	219
Net unrealized gain on AFS securities	1,116	2,684
Net unrealized gain on trading securities	70	105
Intangibles	117	151
Investment activity	105
Other	157	113
Total deferred tax liabilities	3,942	4,877
Net deferred tax asset (liability)	$ (1,867)	$ (3,024)