Income Tax (Net Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Investments, including derivatives (1)	$ 213	$ 44
Net operating loss carryforwards	1,082	1,025
Tax credit carryforwards	105	58
Employee benefits	4	4
Intangibles	97	159
Other	18	0
Deferred Tax Assets, Gross	1,519	1,290
Deferred income tax liabilities:
Policyholder liabilities and receivables (1)	1,307	1,386
Net unrealized investment gains	858	198
DAC	655	633
Other	0	17
Deferred Tax Liabilities, Gross	2,820	2,234
Deferred tax assets and liabilities [Abstract]
Net deferred income tax asset (liability)	$ (1,301)	$ (944)