Investments (HTM Contractual Maturity) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-Maturity Securities, Fair Value	$ 452	$ 757
Held-to-maturity securities (fair value of $452 and $757)	447	760
Mortgage-Backed Securities [Member]
Schedule of Held-to-Maturity Securities [Line Items]
Held-to-Maturity Securities, Fair Value	298	366
Held-to-maturity securities (fair value of $452 and $757)	302	373
Non-Mortgage-Backed Securities [Member]
Schedule of Held-to-Maturity Securities [Line Items]
Contractual Maturities, Due after One Year through Five Years, Fair Value	28	12
Contractual Maturities, Rolling Year Six Through Ten, Fair Value	74	73
Contractual Maturities, Due after Ten Years, Fair Value	49	73
Held-to-Maturity Securities, Fair Value	154	391
Contractual Maturities, Next Rolling Twelve Months, Fair Value	3	233
Debt Securities, Held-to-Maturity, Amortized Cost, excluding accrued interest, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling within One Year	3	233
Debt Securities, Held-to-Maturity, Amortized Cost, excluding accrued interest, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after One through Five Years	27	12
Debt Securities, Held-to-Maturity, Amortized Cost, excluding accrued interest, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after Five through Ten Years	69	72
Debt Securities, Held-to-Maturity, Amortized Cost, excluding accrued interest, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years	46	70
Held-to-maturity securities (fair value of $452 and $757)	$ 145	$ 387