Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 228,160	$ 216,153
Annuities
Segment Reporting Information [Line Items]
Total assets	158,154	152,740
Life
Segment Reporting Information [Line Items]
Total assets	17,288	16,389
Run-off
Segment Reporting Information [Line Items]
Total assets	38,262	35,132
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 14,456	$ 11,892