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VARIABLE INTEREST ENTITIES - Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Variable Interest Entity [Line Items]      
Assets $ 37,721 $ 34,615 $ 33,903
Liabilities 32,824 29,732  
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Assets 145 154  
Liabilities 118 136  
Maximum Exposure to Loss 144 153  
Trust Preferred Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Assets 1 1  
Liabilities 66 66  
Maximum Exposure to Loss 0 0  
Affordable Housing Tax Credit Partnerships [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Assets 113 120  
Liabilities 42 60  
Maximum Exposure to Loss 113 120  
Other Investments [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Assets 31 33  
Liabilities 10 10  
Maximum Exposure to Loss $ 31 $ 33