Investments (Net Investment Income) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Gross investment income	$ 5,474	$ 5,445	$ 4,917
Less: Investment expenses	335	345	357
Net investment income	5,139	5,100	4,560
Fixed maturity securities
Net Investment Income [Line Items]
Gross investment income	3,664	3,708	3,481
Trading securities
Net Investment Income [Line Items]
Gross investment income	23	0	0
Equity securities
Net Investment Income [Line Items]
Gross investment income	1	3	2
Mortgage loans
Net Investment Income [Line Items]
Gross investment income	1,023	1,000	957
Policy loans
Net Investment Income [Line Items]
Gross investment income	48	48	45
Limited partnerships and LLCs
Net Investment Income [Line Items]
Gross investment income	372	357	167
Cash, cash equivalents and short-term investments
Net Investment Income [Line Items]
Gross investment income	233	225	181
Other
Net Investment Income [Line Items]
Gross investment income	$ 110	$ 104	$ 84

Amount, before 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.

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