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Loans and Leases - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest | $ 143,000,000 | $ 143,000,000 | $ 180,000,000
Net loans and leases | 54,701,000,000 | 54,701,000,000 | 57,269,000,000
Loans and leases | 55,435,000,000 | 55,435,000,000 | 58,232,000,000
Troubled debt restructurings loans | 239,000,000 | 239,000,000 | 307,000,000
C&I |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Collateral for secured borrowings | 174,000,000 | 174,000,000 | 167,000,000
Allowance for credit loss, writeoff, collateral | 9,000,000 | 25,000,000 |
Loans Held For Sale, Residential Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructurings loans | 37,000,000 | 37,000,000 | 42,000,000
Commercial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 31,516,000,000 | 31,516,000,000 | 33,104,000,000
Commercial | Commercial and industrial | Finance And Insurance Companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 3,200,000,000 | 3,200,000,000 |
Commercial | Commercial and industrial | Loans to mortgage companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 5,139,000,000 | $ 5,139,000,000 | 5,404,000,000
Percentage contributed | 26.00% | 26.00% |
Commercial | Commercial and industrial | C&I |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 26,377,000,000 | $ 26,377,000,000 | 27,700,000,000
Collateral for secured borrowings | 161,000,000 | 161,000,000 |
Commercial | Loans to mortgage companies |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 5,139,000,000 | 5,139,000,000 | 5,404,000,000
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 12,194,000,000 | 12,194,000,000 | 12,275,000,000
Commercial | Commercial real estate | CRE |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 12,194,000,000 | 12,194,000,000 | 12,275,000,000
Collateral for secured borrowings | 13,000,000 | 13,000,000 |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 10,787,000,000 | 10,787,000,000 | 11,725,000,000
Consumer | Consumer Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 10,787,000,000 | 10,787,000,000 | 11,725,000,000
Allowance for credit loss, writeoff, collateral | 0 | 0 |
Consumer | Consumer Real Estate | HELOC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 2,041,000,000 | 2,041,000,000 | 2,420,000,000
Collateral for secured borrowings | 8,000,000 | 8,000,000 | 9,000,000
Consumer | Consumer Real Estate | Real estate installment loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | 8,746,000,000 | 8,746,000,000 | 9,305,000,000
Collateral for secured borrowings | 21,000,000 | 21,000,000 | 26,000,000
Asset Pledged as Collateral |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net loans and leases | $ 37,400,000,000 | $ 37,400,000,000 | $ 38,600,000,000

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