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Asset Quality - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of carrying amount of our commercial nonperforming loans outstanding | 72.00% | 72.00% |  |
Percentage of nonperforming loans outstanding face value | 77.00% | 77.00% |  |
Percentage of loans held for sale and other nonperforming assets | 80.00% | 80.00% |  |
Net reduction to interest income |  | $ 37 | $ 17 | $ 17
Contractually current percentage of nonperforming loans | 51.00% | 51.00% | 41.00% |
Financial receivable, modifications, subsequent default, recorded investment |  |  | $ 12 |
Number of Loans | loan |  |  | 4,205 |
Loan restructuring trial modifications amount |  | $ 295 |  |
Commitments outstanding to lend additional funds | $ 61 | $ 61 |  |
Commitments outstanding to lend additional funds to borrowers |  |  | $ 10 |
Trial Modification Plans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  | 121 |  |
Loan restructuring trial modifications amount |  | $ 15 |  |
Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loan restructuring trial modifications amount |  | $ 269 |  |
TDRs, period for default (in days) |  | 90 days |  |
Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | $ 89 | $ 156 |
Loan restructuring trial modifications amount |  | $ 26 |  |
TDRs, period for default (in days) |  | 60 days |  |
Continuing Operations | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in ALLL |  | $ 196 |  |
Percentage of increase (decrease) in ALLL |  | 22.70% |  |
Continuing Operations | Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Increase (decrease) in ALLL |  | $ (25) |  |
Percentage of increase (decrease) in ALLL |  | (5.30%) |  |
Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans | loan |  |  | 12 |
Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans | loan |  |  | 191 |
Commercial and Industrial | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | $ 11 |  |
Loan restructuring trial modifications amount |  | 263 |  |
Commercial mortgage | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 1 |  |  |
Loan restructuring trial modifications amount |  | 6 |  |
Non-performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonperforming loans on nonaccrual status with no allowance | $ 301 | $ 301 |  |
Number of Loans | loan |  |  | 1,240 |
Non-performing Loans | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 31 |
Non-performing Loans | Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 1,209 |
Non-performing Loans | Commercial and Industrial | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 27 |
Non-performing Loans | Commercial mortgage | Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | loan |  |  | 4 |

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