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Loans and Leases - Quality of Loans Held for Investment (Parenthetical) (Details) - Taxi Medallion Loans - Commercial and Industrial - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Loans 90 Days Or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 7 | $ 19
Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 0 | $ 0

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