Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net investment income	$ 1,361	$ 1,232	$ 2,702	$ 2,456
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	502	455	997	871
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	495	423	972	891
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	92	88	178	172
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	250	245	499	485
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 22	$ 21	$ 56	$ 37