Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 209,908	$ 195,830
Annuities
Segment Reporting Information [Line Items]
Total assets	148,581	137,079
Life
Segment Reporting Information [Line Items]
Total assets	15,426	14,928
Run-off
Segment Reporting Information [Line Items]
Total assets	34,258	32,390
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 11,643	$ 11,433