Segment Information - Reconciliation of Assets from Segments to Consolidated (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 383,381	$ 372,413
Other Operations
Segment Reporting Information [Line Items]
Total assets	20,433	21,375
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Total assets	194,359	185,599
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Total assets	111,102	108,932
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Total assets	9,759	9,714
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 47,728	$ 46,793