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Other Long-Term Liabilities - Components of Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Other Liabilities Noncurrent [Abstract]    
Assumed gathering, processing and transportation contracts $ 474  
Pension and postretirement benefit obligations 227 $ 243
Commodity derivatives 157 5
Restructuring and transaction costs 122 137
Estimated future obligation under a performance guarantee 95  
Other 173 166
Total other long-term liabilities $ 1,248 $ 551