Commitments and Contingencies - Schedule of the Contractual Amount of Significant Commitments (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Mar. 31, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|---|---|
| Other Commitments [Line Items] | ||||||
| Stand-by letters of credit | $ 397 | $ 628 | ||||
| Total commitments | 12,736 | 11,311 | ||||
| Allowance for credit losses on loans and leases | 869 | $ 954 | 1,030 | $ 1,106 | $ 1,168 | $ 1,201 |
| Total loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Allowance for credit losses on loans and leases | 56 | 55 | ||||
| Total loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 12,339 | 10,683 | ||||
| Multi-family and Commercial real estate | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 566 | 553 | ||||
| One-to-four family including interest rate locks | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | 1,302 | 1,031 | ||||
| Other loan commitments | ||||||
| Other Commitments [Line Items] | ||||||
| Total loan commitments | $ 10,471 | $ 9,099 |