Investments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss	$ 3	$ 2
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss	$ 88	$ 89
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable	Accrued interest receivable
Debt Securities, Available-for-Sale, Excluded Accrued Interest from Amortized Cost [true false]	true	true
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable	Accrued interest receivable
Debt Securities, Held-to-Maturity, Excluded Accrued Interest [true false]	true	true