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SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS (Unaudited) - Standardized Measure of Discounted Future Net Cash Flows - Proved Crude Oil and Natural Gas Reserves (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure [Abstract]        
Future cash inflows $ 32,173 $ 40,681 $ 43,578  
Future development costs (3,585) (3,809) (3,560)  
Future production costs (10,763) (9,319) (7,727)  
Future production taxes (2,354) (2,905) (2,935)  
Future income tax expenses (727) (2,635) (3,913)  
Future net cash flows 14,744 22,013 25,443  
10% discount to reflect timing of cash flows (7,986) (11,829) (13,767)  
Standardized measure of discounted future net cash flows(1) 6,758 10,184 11,676 $ 3,757
Oil and Gas, Delivery Commitment [Line Items]        
Standardized measure of discounted future net cash flows(1) $ 6,758 10,184 11,676 $ 3,757
Viper Energy Partners LP        
Oil and Gas, Delivery Commitment [Line Items]        
Noncontrolling interest, ownership percentage 42.00%      
Viper Energy Partners LP        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Standardized Measure [Abstract]        
Standardized measure of discounted future net cash flows(1) $ 1,000 1,300 1,100  
Oil and Gas, Delivery Commitment [Line Items]        
Standardized measure of discounted future net cash flows(1) $ 1,000 $ 1,300 $ 1,100