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RECENT ACCOUNTING PRONOUNCEMENTS - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Allowance for credit losses, period increase (decrease) $ 23  
Operating lease right-of-use assets 3,041 $ 2,856
Operating lease liability $ 3,019 $ 2,929