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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest | $ 180 |  | $ 180 |  | $ 134
Net loans and leases | 56,690 |  | 56,690 |  | 54,189
Loans and leases | 57,354 |  | 57,354 |  | 54,859
Troubled debt restructurings loans | 204 |  | 204 |  | 206
C&I | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 116 |  | 116 |  | 120
Allowance for credit loss, writeoff, collateral | 5 |  | 9 |  |
Loans Held For Sale, Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings loans | 31 |  | 31 |  | 35
Commercial: | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 31,620 |  | 31,620 |  | 31,068
Commercial: | Commercial and industrial | Loans to mortgage companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | $ 2,710 |  | $ 2,710 |  | 4,518
Percentage contributed | 22.00% |  | 22.00% |  |
Commercial: | Commercial and industrial | Finance And Insurance Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | $ 4,100 |  | $ 4,100 |  |
Commercial: | Commercial and industrial | C&I |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 28,910 |  | 28,910 |  | 26,550
Commercial: | Commercial and industrial | C&I | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 108 |  | 108 |  |
Commercial: | Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 13,021 |  | 13,021 |  | 12,109
Commercial: | Commercial real estate | CRE |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 13,021 |  | 13,021 |  | 12,109
Commercial: | Commercial real estate | CRE | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 8 |  | 8 |  |
Consumer: |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 11,864 |  | 11,864 |  | 10,772
Consumer: | Consumer Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 11,864 |  | 11,864 |  | 10,772
Consumer: | Consumer Real Estate | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit loss, writeoff, collateral | 2 | $ 0 | 2 | $ 0 |
Consumer: | Consumer Real Estate | HELOC |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 1,977 |  | 1,977 |  | 1,964
Consumer: | Consumer Real Estate | HELOC | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 7 |  | 7 |  | 7
Consumer: | Consumer Real Estate | Real estate installment loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 9,887 |  | 9,887 |  | 8,808
Consumer: | Consumer Real Estate | Real estate installment loans | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 28 |  | 28 |  | 20
Asset Pledged as Collateral |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net loans and leases | $ 37,400 |  | $ 37,400 |  | $ 36,600

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