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Mortgage Servicing Rights - MSRs and Related Characteristics by Portfolio (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
Fair value | $ 3,289 | $ 3,369 | $ 3,305 | $ 3,187 | $ 3,326 | $ 3,377
MSR portfolio |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
Servicing portfolio | 215,829 | 216,374 |  |  |  |
Fair value | $ 3,289 | $ 3,369 |  |  |  |
Value (bps) | 1.52% | 1.56% |  |  |  |
Weighted-average servicing fees (bps) | 0.30% | 0.30% |  |  |  |
Multiple (value/servicing fees) | 5.06 | 5.17 |  |  |  |
Weighted-average note rate | 4.34% | 4.18% |  |  |  |
Weighted-average age (in years) | 5 years 4 months 24 days | 5 years |  |  |  |
Weighted-average expected prepayment (constant prepayment rate) | 8.90% | 8.60% |  |  |  |
Weighted-average expected life (in years) | 7 years 3 months 18 days | 7 years 4 months 24 days |  |  |  |
Weighted-average option adjusted spread | 5.90% | 5.70% |  |  |  |
MSR portfolio | HFA |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
Servicing portfolio | $ 56,166 | $ 52,807 |  |  |  |
Fair value | $ 840 | $ 856 |  |  |  |
Value (bps) | 1.50% | 1.62% |  |  |  |
Weighted-average servicing fees (bps) | 0.35% | 0.35% |  |  |  |
Multiple (value/servicing fees) | 4.23 | 4.57 |  |  |  |
Weighted-average note rate | 5.12% | 4.92% |  |  |  |
Weighted-average age (in years) | 4 years 8 months 12 days | 4 years 6 months |  |  |  |
Weighted-average expected prepayment (constant prepayment rate) | 10.00% | 9.90% |  |  |  |
Weighted-average expected life (in years) | 7 years 6 months | 7 years 6 months |  |  |  |
Weighted-average option adjusted spread | 7.30% | 5.80% |  |  |  |
MSR portfolio | Government |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
Servicing portfolio | $ 23,995 | $ 25,139 |  |  |  |
Fair value | $ 472 | $ 512 |  |  |  |
Value (bps) | 1.97% | 2.04% |  |  |  |
Weighted-average servicing fees (bps) | 0.45% | 0.45% |  |  |  |
Multiple (value/servicing fees) | 4.41 | 4.56 |  |  |  |
Weighted-average note rate | 4.40% | 4.35% |  |  |  |
Weighted-average age (in years) | 6 years 7 months 6 days | 6 years 1 month 6 days |  |  |  |
Weighted-average expected prepayment (constant prepayment rate) | 10.20% | 10.20% |  |  |  |
Weighted-average expected life (in years) | 6 years 9 months 18 days | 6 years 9 months 18 days |  |  |  |
Weighted-average option adjusted spread | 6.90% | 6.20% |  |  |  |
MSR portfolio | Conventional |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |
Servicing portfolio | $ 135,668 | $ 138,428 |  |  |  |
Fair value | $ 1,977 | $ 2,001 |  |  |  |
Value (bps) | 1.46% | 1.45% |  |  |  |
Weighted-average servicing fees (bps) | 0.25% | 0.25% |  |  |  |
Multiple (value/servicing fees) | 5.75 | 5.69 |  |  |  |
Weighted-average note rate | 4.01% | 3.87% |  |  |  |
Weighted-average age (in years) | 5 years 4 months 24 days | 5 years |  |  |  |
Weighted-average expected prepayment (constant prepayment rate) | 8.30% | 7.80% |  |  |  |
Weighted-average expected life (in years) | 7 years 2 months 12 days | 7 years 4 months 24 days |  |  |  |
Weighted-average option adjusted spread | 5.10% | 5.60% |  |  |  |

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