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Equity Method Investments and Variable Interest Entities (Consolidated 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, Primary Beneficiary | Fasttrax Limited (Fasttrax project)    
Schedule of Equity Method Investments [Line Items]    
Total Assets 30 45
Total Liabilities 3 18
Variable Interest Entity, Primary Beneficiary | Aspire Defence subcontracting entities (Aspire Defence project)    
Schedule of Equity Method Investments [Line Items]    
Total Assets 447 448
Total Liabilities $ 214 $ 205