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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Beginning Balance [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments   $ 281 $ 151
Joint Venture Earnings [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments $ 81 149  
Dividends Paid by Joint Venture [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (43) (92)  
Advances [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 3 (10)  
New Investments [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 5 80  
Cumulative Translation Adjustment [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (1) (9)  
Other Activity [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (7) 1  
Subtotal Before Reclassification [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 319 270  
Reclassification of excess distribution [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 12 16  
Recognition of Excess Distribution [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (4) (5)  
Ending Balance [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments $ 327 281  
Brown & Root JV [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments   58  
EPIC Piping [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments   $ 24