Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Amortized cost, due in one year or less	$ 4,873
Amortized cost, due after one year through five years	19,360
Amortized cost, due after five years through ten years	13,015
Amortized cost, due after ten years	27,629
Amortized cost, Structured Securities	21,030
Fixed maturity securities, amortized cost	85,907	$ 86,565
Estimated fair value, due in one year or less	4,848
Estimated fair value, due after one year through five years	19,128
Estimated fair value, due after five years through ten years	12,647
Estimated fair value, due after ten years	24,030
Estimated fair value, Structured Securities	20,307
Fixed maturity securities, at estimated fair value	$ 80,960	$ 79,129