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Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 16,661 | $ 8,995
Marketable equity securities | 75 | 95
Total derivative assets | 904 | 159
Total derivative liabilities | 912 | 486
U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 8,647 | 1,898
Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 5,600 | 4,795
Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 1,797 | 1,604
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 10 |
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 16,661 | 8,995
Marketable equity securities | 75 | 95
Loans held for sale | 22 | 4
Total derivative assets | 904 | 159
Total derivative liabilities | 912 | 486
Fair Value, Recurring | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 748 | 158
Total derivative liabilities | 781 | 482
Fair Value, Recurring | Foreign exchange contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 151 | 1
Total derivative liabilities | 130 | 4
Fair Value, Recurring | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 5 |
Total derivative liabilities | 1 |
Fair Value, Recurring | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Marketable equity securities | 31 | 32
Loans held for sale | 0 | 0
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Foreign exchange contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 |
Total derivative liabilities | 0 |
Fair Value, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 16,509 | 8,821
Marketable equity securities | 44 | 63
Loans held for sale | 22 | 4
Total derivative assets | 898 | 159
Total derivative liabilities | 911 | 486
Fair Value, Recurring | Level 2 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 747 | 158
Total derivative liabilities | 781 | 482
Fair Value, Recurring | Level 2 | Foreign exchange contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 151 | 1
Total derivative liabilities | 130 | 4
Fair Value, Recurring | Level 2 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 |
Total derivative liabilities | 0 |
Fair Value, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 152 | 174
Marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Total derivative assets | 6 | 0
Total derivative liabilities | 1 | 0
Fair Value, Recurring | Level 3 | Interest rate contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 1 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Foreign exchange contract |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Other derivative |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 5 |
Total derivative liabilities | 1 |
Fair Value, Recurring | U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 8,647 | 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 | 8,647 | 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 | 129 | 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 | 129 | 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 | 5,600 | 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 | 5,600 | 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 | 1,797 | 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 | 1,797 | 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 | 478 | 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 | 326 | 362
Fair Value, Recurring | Corporate Bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 152 | $ 174
Fair Value, Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 10 |
Fair Value, Recurring | Municipal bonds | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 |
Fair Value, Recurring | Municipal bonds | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 10 |
Fair Value, Recurring | Municipal bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 0 |

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