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FAIR VALUE - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 27,053 | $ 19,936
Marketable equity securities | 78 | 84
Total derivative assets | 646 | 640
Total derivative liabilities | 636 | 636
U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 11,751 | 10,508
Residential mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 11,975 | 6,686
Commercial mortgage-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 2,727 | 2,131
Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 17 | 12
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 27,053 | 19,936
Marketable equity securities | 78 | 84
Loans held for sale | 67 | 38
Total derivative assets | 646 | 640
Total derivative liabilities | 636 | 636
Fair Value, Recurring | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 646 | 640
Total derivative liabilities | 636 | 636
Fair Value, Recurring | Interest rate contracts | Qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Interest rate contracts | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 553 | 530
Total derivative liabilities | 569 | 518
Fair Value, Recurring | Foreign exchange contract | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 83 | 104
Total derivative liabilities | 66 | 117
Fair Value, Recurring | Other derivative | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 10 | 6
Total derivative liabilities | 1 | 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 | 32 | 36
Loans held for sale | 0 | 0
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Interest rate contracts | Qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 1 | Interest rate contracts | Non-qualifying Hedges |  |
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 | Non-qualifying Hedges |  |
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 | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 26,892 | 19,779
Marketable equity securities | 46 | 48
Loans held for sale | 67 | 38
Total derivative assets | 635 | 633
Total derivative liabilities | 635 | 635
Fair Value, Recurring | Level 2 | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 635 | 633
Total derivative liabilities | 635 | 635
Fair Value, Recurring | Level 2 | Interest rate contracts | Qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 2 | Interest rate contracts | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 552 | 529
Total derivative liabilities | 569 | 518
Fair Value, Recurring | Level 2 | Foreign exchange contract | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 83 | 104
Total derivative liabilities | 66 | 117
Fair Value, Recurring | Level 2 | Other derivative | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 161 | 157
Marketable equity securities | 0 | 0
Loans held for sale | 0 | 0
Total derivative assets | 11 | 7
Total derivative liabilities | 1 | 1
Fair Value, Recurring | Level 3 | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 11 | 7
Total derivative liabilities | 1 | 1
Fair Value, Recurring | Level 3 | Interest rate contracts | Qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 0 | 0
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Interest rate contracts | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 1 | 1
Total derivative liabilities | 0 | 0
Fair Value, Recurring | Level 3 | Foreign exchange contract | Non-qualifying Hedges |  |
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 | Non-qualifying Hedges |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Total derivative assets | 10 | 6
Total derivative liabilities | 1 | 1
Fair Value, Recurring | U.S. Treasury |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 11,751 | 10,508
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 | 11,751 | 10,508
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 | 97 | 117
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 | 97 | 117
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 | 11,975 | 6,686
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 | 11,975 | 6,686
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 | 2,727 | 2,131
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 | 2,727 | 2,131
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 | 486 | 482
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 | 325 | 325
Fair Value, Recurring | Corporate Bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 161 | 157
Fair Value, Recurring | Municipal bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 17 | 12
Fair Value, Recurring | Municipal bonds | Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 0 | 0
Fair Value, Recurring | Municipal bonds | Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | 17 | 12
Fair Value, Recurring | Municipal bonds | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investment securities available for sale | $ 0 | $ 0

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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