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REVENUE - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Contract liabilities $ 1,299   $ 1,299   $ 1,368
Revenues relating to contract liabilities outstanding 134 $ 161 297 $ 315  
Transaction price allocated to remaining performance obligations $ 1,900   $ 1,900