Segment Information (Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 220,333	$ 215,438	$ 249,731
Annuities
Segment Reporting Information [Line Items]
Total assets	152,800	148,228
Life
Segment Reporting Information [Line Items]
Total assets	17,415	17,214
Run-off
Segment Reporting Information [Line Items]
Total assets	31,110	28,466
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 19,008	$ 21,530