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Quarterly Financial Data - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Line Items]                    
Equity Method Investment, Realized Gain (Loss) on Disposal               $ 380 $ 0 $ 0
Gain (Loss) on Disposition of Proved Property               0    
Contractual Obligation $ 1,013             1,013    
Gain (Loss) on Extinguishment of Debt   $ (47)     $ (71) $ (71)   (47) (71) (17)
Other—net               18 $ 7 $ 15
San Juan Gallup [Member]                    
Quarterly Financial Data [Line Items]                    
Gain (Loss) on Disposition of Proved Property             $ 138      
Pending Litigation [Member]                    
Quarterly Financial Data [Line Items]                    
Other—net   $ 11                
Oryxx II Pipeline                    
Quarterly Financial Data [Line Items]                    
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 247         $ 247    
Whitewater [Member]                    
Quarterly Financial Data [Line Items]                    
Equity Method Investment, Realized Gain (Loss) on Disposal $ 7     $ 126            
Guarantee Type, Other [Member] | San Juan Gallup [Member]                    
Quarterly Financial Data [Line Items]                    
Contractual Obligation             $ 9