Segment Information (Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 216,153	$ 195,830
Separate account assets	99,668	91,511
Separate account liabilities	99,668	91,511
Annuities
Segment Reporting Information [Line Items]
Total assets	152,740	137,079
Separate account assets	95,524	88,138
Separate account liabilities	95,524	88,138
Life
Segment Reporting Information [Line Items]
Total assets	16,389	14,928
Separate account assets	2,043	1,732
Separate account liabilities	2,043	1,732
Run-off
Segment Reporting Information [Line Items]
Total assets	35,132	32,390
Separate account assets	2,101	1,641
Separate account liabilities	2,101	1,641
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	11,892	11,433
Separate account assets	0	0
Separate account liabilities	$ 0	$ 0