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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructurings (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unfunded commitments related to TDRs | $ 167 | $ 49
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled Debt Restructuring | 367 | 257
Retail |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled Debt Restructuring | $ 714 | $ 718

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