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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of revenue    
Oil and natural gas sales $ 430 $ 601
Other revenue 64 178
Net derivative gain (loss) from commodity contracts 79 (89)
Total revenues 573 690
Oil    
Disaggregation of revenue    
Oil and natural gas sales 356 480
Natural gas    
Disaggregation of revenue    
Oil and natural gas sales 38 62
NGLs    
Disaggregation of revenue    
Oil and natural gas sales 36 59
Electricity    
Disaggregation of revenue    
Other revenue 13 34
Marketing, trading and other    
Disaggregation of revenue    
Other revenue $ 51 $ 144