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Other Commitments And Contingencies (Other) (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2013
Sep. 30, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]        
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months     $ 528 $ 526
Pemex [Member]        
Loss Contingencies [Line Items]        
Outstanding performance bonds by enterprise   $ 80    
Payment on performance bonds   108    
Amount awarded to enterprise in arbitration $ 351      
Amount of counterclaims awarded to project owner in arbitration $ 6      
Amount of judgment awarded to enterprise   465    
Performance Bond Recovery Including Interest   26    
PaymentOnPerformanceBondsOther   $ 2    
Engineering and Construction [Member]        
Loss Contingencies [Line Items]        
Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months     $ 400 $ 400