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FAIR VALUE - Schedule of Fair Value, Assets Measured on Nonrecurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | $ 82 | $ 73
Loans - collateral dependent loans | 134,872 | 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 | 55 | 38
Loans - collateral dependent loans | 1,463 | 1,479
Level 3 | Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 27 | 35
Loans - collateral dependent loans | 133,409 | 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 | 13 | 12
Loans - collateral dependent loans | 388 | 265
Other real estate owned | 16 | 16
Fair Value Measurements | 417 | 293
Fair Value, Nonrecurring | Changes Measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | (7) | (4)
Loans - collateral dependent loans | (171) | (131)
Other real estate owned | 6 | 4
Fair Value Measurements | (172) | (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 | 13 | 12
Loans - collateral dependent loans | 388 | 265
Other real estate owned | 16 | 16
Fair Value Measurements | $ 417 | $ 293

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