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REVENUE RECOGNITION - Narrative (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]    
Number of operating segments | segment 6  
Accounts receivables from customers $ 3,585 $ 3,402
Unbilled receivables 93 94
Backlog of unsatisfied or partially satisfied obligations $ 5,500 $ 5,300
Backlog expected to be recognized in the next twelve months (as a percent) 87.00% 87.00%