Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Financial Effect of FDMs (Details) - Consumer, excluding credit card - Residential real estate - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Financing Receivable, Modified [Line Items] | |||||
| FDMs | $ 923,000,000 | $ 68,000,000 | $ 977,000,000 | $ 98,000,000 | |
| Weighted-average term loan extensions | 15 years | 7 years | 16 years | 10 years | |
| Weighted average contractual interest rate before modification | 7.17% | 7.59% | 7.25% | 7.58% | |
| Weighted average contractual interest rate after modification | 5.65% | 6.04% | 5.82% | 5.50% | |
| Commitments to lend to borrowers experiencing financial difficulty | $ 0 | $ 0 | $ 0 | ||
| Other-than-insignificant payment deferral | |||||
| Financing Receivable, Modified [Line Items] | |||||
| FDMs | $ 887,000,000 | $ 902,000,000 | |||