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DEBT Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Jun. 30, 2016
Debt Instrument [Line Items]      
Debt and capital lease obligations   $ 11,300  
Debt fair value   11,800  
Long-term Debt [Member]      
Debt Instrument [Line Items]      
Proceeds from Other Debt $ 660    
Extinguishment of Debt, Type [Domain]      
Debt Instrument [Line Items]      
Repayments of Other Debt $ 900    
Commercial Paper      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 750
Line of credit, current   $ 375  
Debt, Weighted Average Interest Rate   2.33%