Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net investment income	$ 5,088	$ 5,712	$ 5,274
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	1,820	1,744	1,387
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	1,852	2,515	2,464
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	337	336	333
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	986	999	966
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 93	$ 118	$ 124