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Loans and Leases - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | $ 58,600 | $ 58,232 |  |
Allowance for loan and lease losses | (914) | (963) | $ (444) | $ (307)
Net loans and leases | 57,686 | 57,269 |  |
Equipment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Property, plant, and equipment and finance lease right-of-use asset | 614 | 587 |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 33,951 | 33,104 |  |
Commercial | Commercial and Industrial, Excluding Loans to Mortgage Companies |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 28,421 | 27,700 |  |
Commercial | Loans to mortgage companies |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 5,530 | 5,404 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 33,951 | 33,104 |  |
Allowance for loan and lease losses | (442) | (453) | (255) | (142)
Commercial | Commercial and industrial | Paycheck Protection Plan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 5,100 | 4,100 |  |
Commercial | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 12,470 | 12,275 |  |
Allowance for loan and lease losses | (232) | (242) | (48) | (29)
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 11,053 | 11,725 |  |
Consumer | HELOC |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 2,270 | 2,420 |  |
Consumer | Real estate installment loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 8,783 | 9,305 |  |
Consumer | Credit Card and Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases | 1,126 | 1,128 |  |
Allowance for loan and lease losses | $ (18) | $ (26) | $ (19) | $ (15)

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