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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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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

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-Publisher FASB
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