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Other Long-Term Liabilities - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Terms of the contracts extendible 2038  
Amortization of liabilities as a reduction of production expenses $ 16  
Other current liabilities $ 1,555 $ 536
Probability weighted cash flows for the remainder of the contract term 5 years  
WPX    
Liability for the estimated potential exposure for the remainder of the contract term $ 129  
Other liabilities noncurrent 95  
Other Current Liabilities [Member] | WPX    
Other current liabilities $ 34