Expected Loss to be Paid (Recovered) - Net Economic Loss Development (Benefit) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Schedule of Expected Losses to be Paid [Line Items] | ||||
| RMBS losses | $ 36 | $ 21 | $ 21 | $ 14 |
| RMBS | United States | ||||
| Schedule of Expected Losses to be Paid [Line Items] | ||||
| RMBS losses | (6) | (10) | (9) | (13) |
| RMBS | United States | First Lien | ||||
| Schedule of Expected Losses to be Paid [Line Items] | ||||
| RMBS losses | (4) | (2) | (2) | (3) |
| RMBS | United States | Second Lien | ||||
| Schedule of Expected Losses to be Paid [Line Items] | ||||
| RMBS losses | $ (2) | $ (8) | $ (7) | $ (10) |