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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Collateralized Debt and Loan Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity      
Term of collateralized loan obligation 12 years    
Collateralized loan obligations (CLOs)      
Variable Interest Entity      
Principal securitized $ 0 $ 100 $ 0
Proceeds from new securitizations 0 100 0
Cash flows received on retained interests and other net cash flows 1,100 0 0
Purchases of previously transferred financial assets 200 0 0
Carrying value of retained interests $ 921 $ 1,611 $ 1,404