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FAIR VALUE MEASUREMENTS - Recurring Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Assets:            
Fixed price swaps       $ 53 $ 231  
Liabilities:            
Fixed price swaps       27 15  
Summary Of Changes In Cost Method Investment [Roll Forward]            
Gain (loss) on investment $ 5 $ (1) $ 0      
Impact of adoption of Accounting Standards Update 2016-01           $ (16)
Viper Energy Partners LP | Recurring | Level 1            
Assets:            
Investment 14 34 34 19 14  
Fixed price swaps       0 0  
Liabilities:            
Fixed price swaps       0 0  
Summary Of Changes In Cost Method Investment [Roll Forward]            
Investment, beginning balance 14 34        
Gain (loss) on investment 5 (1)        
Investment, ending balance 19 14 $ 34      
Viper Energy Partners LP | Recurring | Level 2            
Assets:            
Investment 0 0   0 0  
Fixed price swaps       26 216  
Liabilities:            
Fixed price swaps       0 0  
Summary Of Changes In Cost Method Investment [Roll Forward]            
Investment, beginning balance 0          
Investment, ending balance 0 0        
Viper Energy Partners LP | Recurring | Level 3            
Assets:            
Investment 0 0   0 0  
Fixed price swaps       0 0  
Liabilities:            
Fixed price swaps       $ 0 $ 0  
Summary Of Changes In Cost Method Investment [Roll Forward]            
Investment, beginning balance 0          
Investment, ending balance $ 0 $ 0        
Accounting Standards Update 2016-01 | Viper Energy Partners LP            
Summary Of Changes In Cost Method Investment [Roll Forward]            
Impact of adoption of Accounting Standards Update 2016-01           $ (19)