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v3.21.1

Asset Quality - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) SecurityLoan | Mar. 31, 2020 USD ($) SecurityLoan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income (residential) | $ 100,926 |  | $ 101,185
Loan modifications and forbearance, CARES Act | 328 |  |
Loans that have received payment deferral or forbearance, CARES Act | 384 |  |
Accrued interest | $ 242 |  | 241
Percentage of carrying amount of our commercial nonperforming loans outstanding | 68.00% |  |
Percentage of nonperforming loans outstanding face value | 75.00% |  |
Percentage of loans held for sale and other nonperforming assets | 81.00% |  |
Net reduction to interest income | $ 7 | $ 6 |
Commitments outstanding to lend additional funds to borrowers (less than $1 million) | 14 |  | 1
Financial receivable, modifications, subsequent default, recorded investment | 1 | $ 2 |
Commercial Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income (residential) | 71,414 |  | 71,980
Accrued interest | $ 143 |  | 140
TDRs, period for default | 90 days |  |
Number of loans | SecurityLoan | 2 | 0 |
Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income (residential) | $ 29,512 |  | 29,205
Accrued interest | $ 98 |  | 101
TDRs, period for default | 60 days |  |
Number of loans | SecurityLoan | 36 | 84 |
Continuing operations | Commercial Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in ALLL | $ (162) |  |
Increase in ALLL, percent | (14.70%) |  |
Continuing operations | Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in ALLL | $ (26) |  |
Increase in ALLL, percent | (4.90%) |  |
PPP |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income (residential) | $ 6,500 |  |
Real estate — residential mortgage | Consumer Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, net of unearned income (residential) | 10,300 |  | 9,298
Nonperforming financial instruments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonperforming loans on nonaccrual status with no allowance | 461 |  |
Real estate — residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financial receivable, modifications, subsequent default, recorded investment | $ 83 |  | $ 92

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