Segment Information - Reconciliation of Net Investment Income from Segments to Consolidated (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Net investment income	$ 1,605	$ 1,462
Operating Segments \| Annuities
Segment Reporting Information [Line Items]
Net investment income	538	452
Operating Segments \| Life Insurance
Segment Reporting Information [Line Items]
Net investment income	659	626
Operating Segments \| Group Protection
Segment Reporting Information [Line Items]
Net investment income	96	89
Operating Segments \| Retirement Plan Services
Segment Reporting Information [Line Items]
Net investment income	260	251
Other Operations
Segment Reporting Information [Line Items]
Net investment income	$ 52	$ 44

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.