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FAIR VALUE - Schedule of Fair Value, Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | $ 87 | $ 73
Loans - collateral dependent loans | 134,165 | 126,696
Level 1 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Level 2 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 67 | 38
Loans - collateral dependent loans | 1,412 | 1,479
Level 3 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 20 | 35
Loans - collateral dependent loans | 132,753 | 125,217
Fair Value, Nonrecurring | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 5 | 12
Loans - collateral dependent loans | 276 | 265
Other real estate owned | 17 | 16
Fair Value Measurements | 298 | 293
Fair Value, Nonrecurring | Changes Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | (4) | (4)
Loans - collateral dependent loans | (59) | (131)
Other real estate owned | 3 | 4
Fair Value Measurements | (60) | (131)
Fair Value, Nonrecurring | Level 1 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Other real estate owned | 0 | 0
Fair Value Measurements | 0 | 0
Fair Value, Nonrecurring | Level 2 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0 | 0
Loans - collateral dependent loans | 0 | 0
Other real estate owned | 0 | 0
Fair Value Measurements | 0 | 0
Fair Value, Nonrecurring | Level 3 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 5 | 12
Loans - collateral dependent loans | 276 | 265
Other real estate owned | 17 | 16
Fair Value Measurements | $ 298 | $ 293

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