Segment Information (Reconciliation of Operating Revenues to Total Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 306	$ 3,187	$ 2,370	$ 691	$ 4,026	$ 1,422	$ 1,702	$ 1,815	$ 6,554	$ 8,965	$ 6,842
Annuities
Segment Reporting Information [Line Items]
Total revenues									4,648	4,567	4,370
Life
Segment Reporting Information [Line Items]
Total revenues									1,328	1,389	1,315
Run-off
Segment Reporting Information [Line Items]
Total revenues									2,009	2,112	2,147
Corporate & Other
Segment Reporting Information [Line Items]
Total revenues									176	152	510
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total revenues									$ (1,607)	$ 745	$ (1,500)