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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructurings (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unfunded commitments related to TDRs | $ 49 | $ 42
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled Debt Restructuring | 257 | 297
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled Debt Restructuring | $ 718 | $ 667

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