Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net investment income	$ 5,625	$ 5,107	$ 5,733
Operating Segments \| Annuities
Segment Reporting Information [Line Items]
Net investment income	2,048	1,820	1,744
Operating Segments \| Life Insurance
Segment Reporting Information [Line Items]
Net investment income	2,062	1,870	2,533
Operating Segments \| Group Protection
Segment Reporting Information [Line Items]
Net investment income	361	337	336
Operating Segments \| Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	1,012	986	999
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 142	$ 94	$ 121

Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.