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Unapproved Change Orders, and Claims, Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Increases in Unapproved Change Orders and Claims [Line Items]            
Commitments, estimated recovery   $ 1,800   $ 1,800    
Equity in earnings (losses) of unconsolidated affiliates   (186) $ 16 (174) $ 17  
Gross profit   207 142 375 328  
Foreign currency impact       (1) (16)  
Sustainable Technology Solutions            
Increases in Unapproved Change Orders and Claims [Line Items]            
Equity in earnings (losses) of unconsolidated affiliates   (194) 9 (189) 5  
Gross profit   77 $ 25 129 $ 82  
Ichthys LNG Project            
Increases in Unapproved Change Orders and Claims [Line Items]            
Letters of credit outstanding, amount   164   164    
Ichthys LNG Project | Sustainable Technology Solutions            
Increases in Unapproved Change Orders and Claims [Line Items]            
Equity in earnings (losses) of unconsolidated affiliates   (193)   (193)    
EPC Project | Sustainable Technology Solutions            
Increases in Unapproved Change Orders and Claims [Line Items]            
Gross profit   37        
Other Legacy Matters | Sustainable Technology Solutions            
Increases in Unapproved Change Orders and Claims [Line Items]            
Settlement   $ 16        
JKC Joint Venture            
Increases in Unapproved Change Orders and Claims [Line Items]            
Additional investments to joint venture       484    
JKC Joint Venture | Legal Action Against the Consortium for Combined Cycle Power Plant | Settled Litigation            
Increases in Unapproved Change Orders and Claims [Line Items]            
Funds received from litigation settlement $ 52          
Cost Reimbursable            
Increases in Unapproved Change Orders and Claims [Line Items]            
Changes in estimates at completion       $ 157   $ 157
Ichthys LNG Project            
Increases in Unapproved Change Orders and Claims [Line Items]            
Ownership percentage       30.00% 30.00%  
JKC Joint Venture            
Increases in Unapproved Change Orders and Claims [Line Items]            
Ownership percentage       30.00%