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VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Variable Interest Entity    
Tax credits included in income tax expense $ 51 $ 41
Other tax benefits included in income tax expense 12 10
Total tax benefit included in income tax expense 63 51
Less: Amortization expense included in income tax expense 53 43
Net benefit from affordable housing tax credit investments included in income tax expense $ 10 $ 8