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Commitments and Contingencies - Off Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Other Commitments [Line Items] |  |  |  |  |  |
Stand-by letters of credit | $ 699 |  | $ 803 |  |  |
Total commitments | 13,263 |  | 13,843 |  |  |
Allowance for credit losses on loans and leases | 1,106 | $ 1,168 | 1,201 | $ 1,268 | $ 1,215 | $ 992
Total loan commitments |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans and leases | 56 |  | 50 |  |  |
Total loan commitments |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Total loan commitments | 12,564 |  | 13,040 |  |  |
Multi-family and Commercial real estate |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Total loan commitments | 988 |  | 2,478 |  |  |
One-to-four family including interest rate locks |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Total loan commitments | 1,464 |  | 725 |  |  |
Other loan commitments |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Total loan commitments | $ 10,112 |  | $ 9,837 |  |  |

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