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Equity Method Investments and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Total Assets $ 5,522 $ 5,705
Total Liabilities 4,021 4,096
Variable Interest Entity, Not Primary Beneficiary | Affinity joint venture (U.K. MFTS project)    
Schedule of Equity Method Investments [Line Items]    
Total Assets 10 11
Total Liabilities 9 9
Variable Interest Entity, Not Primary Beneficiary | Aspire Defence Limited    
Schedule of Equity Method Investments [Line Items]    
Total Assets 68 68
Total Liabilities 5 5
Variable Interest Entity, Not Primary Beneficiary | JKC joint venture (Ichthys LNG project)    
Schedule of Equity Method Investments [Line Items]    
Total Assets 375 606
Total Liabilities 6 44
Variable Interest Entity, Not Primary Beneficiary | U.K. Roads project joint ventures    
Schedule of Equity Method Investments [Line Items]    
Total Assets 54 59
Total Liabilities 0 0
Variable Interest Entity, Not Primary Beneficiary | Middle East Petroleum Corporation (EBIC ammonia project)    
Schedule of Equity Method Investments [Line Items]    
Total Assets 38 31
Total Liabilities $ 1 $ 1