Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 214,847	$ 195,830
Annuities
Segment Reporting Information [Line Items]
Total assets	150,615	137,079
Life
Segment Reporting Information [Line Items]
Total assets	15,553	14,928
Run-off
Segment Reporting Information [Line Items]
Total assets	36,096	32,390
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 12,583	$ 11,433