Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net investment income	$ 1,341	$ 1,224
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	494	417
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	477	467
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	87	84
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	249	241
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 34	$ 15