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Asset Quality - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) loan | Dec. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of carrying amount of our commercial nonperforming loans outstanding | 76.00% |  |
Percentage of nonperforming loans outstanding face value | 82.00% |  |
Percentage of loans held for sale and other nonperforming assets | 83.00% |  |
Net reduction to interest income | $ 49 | $ 54 | $ 37
Mortgage loans in process of foreclosure | 70 | 72 |
Loan restructuring trial modifications amount | 595 | 534 | 295
Commitments outstanding to lend additional funds | $ 110 | $ 15 |
Trial Modification Plans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loan modifications | loan | 167 | 120 |
Loan restructuring trial modifications amount | $ 26 | $ 20 |
Total commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan restructuring trial modifications amount | 565 | 499 | 269
Total consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan restructuring trial modifications amount | 30 | 35 | 26
Continuing Operations | Total commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in ALLL | $ 41 |  |
Increase (decrease) in ALLL (as a percent) | 4.00% |  |
Continuing Operations | Total consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase (decrease) in ALLL | $ (23) |  |
Increase (decrease) in ALLL (as a percent) | (6.20%) |  |
Commercial and Industrial | Total commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan restructuring trial modifications amount | $ 304 | 163 | 263
Real estate — commercial mortgage | Total commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loan restructuring trial modifications amount | 231 | $ 307 | $ 6
Non-performing Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonperforming loans on nonaccrual status with no allowance | $ 386 |  |

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