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REVENUE RECOGNITION - Disaggregation of revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of revenue        
Revenue from contract with customers $ 700 $ 461 $ 1,932 $ 1,387
Other revenue 182 49 313 113
Interest income     1  
Net derivative loss from commodity contracts (54) (65) (259) 51
Total revenues and other 828 $ 445 1,986 $ 1,551
Oil        
Disaggregation of revenue        
Revenue from contract with customers 568   1,587  
NGLs        
Disaggregation of revenue        
Revenue from contract with customers 71   195  
Natural gas        
Disaggregation of revenue        
Revenue from contract with customers 61   150  
Electricity        
Disaggregation of revenue        
Other revenue 42   87  
Marketing, trading and other        
Disaggregation of revenue        
Other revenue $ 140   $ 225