v3.25.1
Fair Value (Level 3) (Details) - Subtotal PLRMBS - Fair Value, Measurements, Recurring - Level 3 - Available-for-sale Securities - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of the period $ 957 $ 1,059
Interest income 3 (2)
(Provision for)/reversal of credit losses (1) 4
Unrealized gain/(loss) included in AOCI 2 (3)
Settlements (19) (30)
Balance, end of the period 942 1,028
Total amount of unrealized gain/(loss) for the period included in AOCI relating to assets held at the end of the period 2 (3)
Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets held at the end of the period $ 2 $ 2