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Loans and Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest | $ 152 |  | $ 152 |  | $ 134
Net loans and leases | 55,905 |  | 55,905 |  | 54,189
Loans and leases | 56,529 |  | 56,529 |  | 54,859
Troubled debt restructurings loans | 199 |  | 199 |  | 206
C&I | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 98 |  | 98 |  | 120
Allowance for credit loss, writeoff, collateral | 1 |  | 4 |  |
Loans Held For Sale, Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings loans | 32 |  | 32 |  | 35
Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 31,276 |  | 31,276 |  | 31,068
Commercial | Commercial and industrial | Loans to mortgage companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | $ 3,441 |  | $ 3,441 |  | 4,518
Percentage contributed | 23.00% |  | 23.00% |  |
Commercial | Commercial and industrial | Finance And Insurance Companies |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | $ 3,700 |  | $ 3,700 |  |
Commercial | Commercial and industrial | C&I |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 27,835 |  | 27,835 |  | 26,550
Commercial | Commercial and industrial | C&I | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 91 |  | 91 |  |
Commercial | Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 12,942 |  | 12,942 |  | 12,109
Commercial | Commercial real estate | CRE |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 12,942 |  | 12,942 |  | 12,109
Commercial | Commercial real estate | CRE | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 7 |  | 7 |  |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 11,441 |  | 11,441 |  | 10,772
Consumer | Consumer Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 11,441 |  | 11,441 |  | 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 | 1,917 |  | 1,917 |  | 1,964
Consumer | Consumer Real Estate | HELOC | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 8 |  | 8 |  | 7
Consumer | Consumer Real Estate | Real estate installment loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 9,524 |  | 9,524 |  | 8,808
Consumer | Consumer Real Estate | Real estate installment loans | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and leases | 34 |  | 34 |  | 20
Asset Pledged as Collateral |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net loans and leases | $ 37,100 |  | $ 37,100 |  | $ 36,600

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