Income Tax (Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets:
Policyholder liabilities and receivables	$ 2,841	$ 1,638
Investments, including derivatives	373	0
Tax credit carryforwards	180	168
Other	52	39
Total deferred income tax assets	3,446	1,845
Deferred income tax liabilities:
Investments, including derivatives	0	132
Intangibles	391	521
Net unrealized investment gains	736	837
DAC	1,301	1,158
Total deferred income tax liabilities	2,428	2,648
Deferred tax assets and liabilities [Abstract]
Deferred Tax Assets, Net	1,018	0
Net deferred income tax asset (liability)	$ 0	$ (803)