Commitments and Contingencies (Details) - USD ($) $ in Millions |
Sep. 30, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
Sep. 30, 2024 |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|---|---|---|---|
| Other Commitments [Line Items] | ||||||
| Stand-by letters of credit | $ 661 | $ 803 | ||||
| Total commitments | 13,186 | 13,843 | ||||
| Allowance for credit losses on loans and leases | 1,071 | $ 1,106 | 1,201 | $ 1,264 | $ 1,268 | $ 992 |
| Total loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Allowance for credit losses on loans and leases | 57 | 50 | ||||
| Total loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 12,525 | 13,040 | ||||
| Multi-family and Commercial real estate | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 748 | 2,478 | ||||
| One-to-four family including interest rate locks | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 1,381 | 725 | ||||
| Other loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | $ 10,396 | $ 9,837 |