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Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 9,210 | $ 9,203
Marketable equity securities | 94 | 98
Fair value of derivative financial instruments | 80 | 3
Fair value of derivative financial instruments | 308 | 1
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 9,210 | 9,203
Marketable equity securities | 94 | 98
Loans held for sale | 22 | 99
Fair value of derivative financial instruments | 80 |
Fair value of derivative financial instruments | 308 |
Fair Value, Recurring | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 76 |
Fair value of derivative financial instruments | 305 |
Fair Value, Recurring | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 4 |
Fair value of derivative financial instruments | 3 |
Fair Value, Recurring | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Marketable equity securities | 32 | 34
Loans held for sale | 0 | 0
Fair value of derivative financial instruments | 0 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | Level 1 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 0 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | Level 1 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 0 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 9,030 | 8,996
Marketable equity securities | 62 | 64
Loans held for sale | 22 | 99
Fair value of derivative financial instruments | 79 |
Fair value of derivative financial instruments | 308 |
Fair Value, Recurring | Level 2 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 75 |
Fair value of derivative financial instruments | 305 |
Fair Value, Recurring | Level 2 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 4 |
Fair value of derivative financial instruments | 3 |
Fair Value, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 180 | 207
Marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Fair value of derivative financial instruments | 1 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | Level 3 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 1 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | Level 3 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value of derivative financial instruments | 0 |
Fair value of derivative financial instruments | 0 |
Fair Value, Recurring | U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,903 | 2,005
Fair Value, Recurring | U.S. Treasury | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | U.S. Treasury | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,903 | 2,005
Fair Value, Recurring | U.S. Treasury | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Government agency |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 190 | 221
Fair Value, Recurring | Government agency | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Government agency | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 190 | 221
Fair Value, Recurring | Government agency | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 5,020 | 4,729
Fair Value, Recurring | Residential mortgage-backed securities | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Residential mortgage-backed securities | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 5,020 | 4,729
Fair Value, Recurring | Residential mortgage-backed securities | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,527 | 1,640
Fair Value, Recurring | Commercial mortgage-backed securities | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Commercial mortgage-backed securities | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,527 | 1,640
Fair Value, Recurring | Commercial mortgage-backed securities | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 570 | 608
Fair Value, Recurring | Corporate bonds | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Corporate bonds | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 390 | 401
Fair Value, Recurring | Corporate bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 180 | $ 207

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