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VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Variable Interest Entity        
Tax credits included in income tax expense $ 48 $ 40 $ 150 $ 120
Other tax benefits included in income tax expense 11 10 36 30
Total tax benefits included in income tax expense 59 50 186 150
Less: Amortization included in income tax expense 50 42 156 127
Net benefit from affordable housing tax credit investments included in income tax expense $ 9 $ 8 $ 30 $ 23