Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 214,306	$ 216,153
Annuities
Segment Reporting Information [Line Items]
Total assets	143,445	152,740
Life
Segment Reporting Information [Line Items]
Total assets	16,129	16,389
Run-off
Segment Reporting Information [Line Items]
Total assets	36,523	35,132
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 18,209	$ 11,892