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Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Schedule of Held-to-Maturity Securities [Line Items] |  |
Debt securities, available-for-sale and held-to-maturity, allowance for credit loss | $ 1 | $ 1
Agency residential mortgage-backed securities (“RMBS”) |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
AOCI, transfers from AFS to HTM Securities, gross unrealized losses, amortized cost | 755 |
Available-for-sale securities transferred to held-to-maturity | $ 759 |

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