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Unapproved Change Orders, and Claims, Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Rollforward) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Unapproved Change Orders [Roll Forward]    
Amounts included in project estimates-at-completion at January 1, $ 973 $ 924
Increase (decrease), including foreign currency effect 16 (17)
Amounts included in project estimates-at-completion at March 31, 989 907
Amounts recognized over time based on progress at March 31, $ 965 $ 843