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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2004
Loss Contingencies [Line Items]          
Self Insurance Reserve, Noncurrent   $ 52 $ 66    
Payment on performance bonds   0 0 $ 108  
Claims receivable   526 570    
Pemex [Member]          
Loss Contingencies [Line Items]          
Outstanding performance bonds by enterprise       80  
Payment on performance bonds       108  
Customer's arbitration claim         $ 157
Amount of arbitration claim filed by enterprise         $ 323
Amount awarded to enterprise in arbitration $ 351        
Amount of counterclaims awarded to project owner in arbitration 6        
Gain recognized $ 117        
Amount of judgment awarded to enterprise       465  
Performance Bond Recovery Including Interest       26  
PaymentOnPerformanceBondsOther       $ 2  
Accounts Payable and Accrued Liabilities [Member]          
Loss Contingencies [Line Items]          
Self Insurance Reserve, Noncurrent   14 14    
Other Current Liabilities [Member]          
Loss Contingencies [Line Items]          
Self Insurance Reserve, Noncurrent   12 19    
Other Liabilities [Member]          
Loss Contingencies [Line Items]          
Self Insurance Reserve, Noncurrent   $ 26 $ 33