Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Net investment income	$ 1,439	$ 1,309	$ 4,152	$ 3,775
Operating Segments | Annuities
Segment Reporting Information [Line Items]
Net investment income	504	468	1,502	1,340
Operating Segments | Life Insurance
Segment Reporting Information [Line Items]
Net investment income	545	481	1,525	1,380
Operating Segments | Group Protection
Segment Reporting Information [Line Items]
Net investment income	93	80	271	253
Operating Segments | Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	254	251	753	736
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 43	$ 29	$ 101	$ 66