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RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset $ 969  
Operating lease, liability 1,061  
Operating lease, liability, noncurrent $ 812  
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset   $ 1,000
Operating lease, liability   1,100
Operating lease, liability, noncurrent   $ 830