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Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 9,061 | $ 8,995
Marketable equity securities | 85 | 95
Interest rate & other derivative — non-qualifying hedges | 547 | 159
Fair value of derivative financial instruments | 791 | 486
U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,978 | 1,898
Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 4,848 | 4,795
Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,585 | 1,604
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 9,061 | 8,995
Marketable equity securities | 85 | 95
Loans held for sale | 9 | 4
Interest rate & other derivative — non-qualifying hedges | 547 | 159
Fair value of derivative financial instruments | 791 | 486
Fair Value, Recurring | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 285 | 158
Fair value of derivative financial instruments | 535 | 482
Fair Value, Recurring | Foreign currency forward contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 262 | 1
Fair value of derivative financial instruments | 255 | 4
Fair Value, Recurring | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 1 | 0
Fair Value, Recurring | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Marketable equity securities | 29 | 32
Loans held for sale | 0 | 0
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 1 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 1 | Foreign currency forward contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 1 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 8,901 | 8,821
Marketable equity securities | 56 | 63
Loans held for sale | 9 | 4
Interest rate & other derivative — non-qualifying hedges | 546 | 159
Fair value of derivative financial instruments | 790 | 486
Fair Value, Recurring | Level 2 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 284 | 158
Fair value of derivative financial instruments | 535 | 482
Fair Value, Recurring | Level 2 | Foreign currency forward contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 262 | 1
Fair value of derivative financial instruments | 255 | 4
Fair Value, Recurring | Level 2 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 160 | 174
Marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Interest rate & other derivative — non-qualifying hedges | 1 | 0
Fair value of derivative financial instruments | 1 | 0
Fair Value, Recurring | Level 3 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 1 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 3 | Foreign currency forward contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 0 | 0
Fair Value, Recurring | Level 3 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Interest rate & other derivative — non-qualifying hedges | 0 | 0
Fair value of derivative financial instruments | 1 | 0
Fair Value, Recurring | U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,978 | 1,898
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 | 1,978 | 1,898
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 | 150 | 162
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 | 150 | 162
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 | 4,848 | 4,795
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 | 4,848 | 4,795
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 | 1,585 | 1,604
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 | 1,585 | 1,604
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 | 500 | 536
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 | 340 | 362
Fair Value, Recurring | Corporate bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 160 | $ 174

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