Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 239,681	$ 227,259
Annuities
Segment Reporting Information [Line Items]
Total assets	162,285	156,965
Life
Segment Reporting Information [Line Items]
Total assets	22,839	21,876
Run-off
Segment Reporting Information [Line Items]
Total assets	38,256	35,112
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 16,301	$ 13,306