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RECENT ACCOUNTING PRONOUNCEMENTS - Narratives (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Operating lease right-of-use assets $ 2,504  
Operating lease liability $ 2,563  
2016-02    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Operating lease right-of-use assets   $ 2,650
Operating lease liability   $ 2,700