Income Tax (Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Tax credit carryforwards	$ 106	$ 58
Net operating loss carryforwards	1,087	1,052
Employee benefits	17	7
Intangibles	93	159
Investments, including derivatives (1)	260	120
Other	15	0
Total net deferred income tax assets	1,578	1,396
Deferred income tax liabilities:
Policyholder liabilities and receivables (1)	1,277	1,379
Net unrealized investment gains	871	202
DAC	785	761
Other	0	26
Total deferred income tax liabilities	2,933	2,368
Deferred tax assets and liabilities [Abstract]
Net deferred income tax asset (liability)	$ (1,355)	$ (972)