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Derivative and Other Financial Instruments (Fair Values of Outstanding Derivative Instruments in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Derivative assets    
Total $ 45 $ 42
Derivative liabilities    
Total 37 52
Level 2 [Member]    
Derivative assets    
Total 45 42
Derivative liabilities    
Total 37 52
Derivatives designated as hedges [Member] | Other current assets [Member] | Foreign exchange [Member] | Level 2 [Member]    
Derivative assets    
Foreign exchange 24 32
Derivatives designated as hedges [Member] | Other current assets [Member] | Commodities [Member] | Level 2 [Member]    
Derivative assets    
Commodities 13 5
Derivatives designated as hedges [Member] | Other non-current assets [Member] | Commodities [Member] | Level 2 [Member]    
Derivative assets    
Commodities 3 2
Derivatives designated as hedges [Member] | Accounts payable and accrued liabilities [Member] | Foreign exchange [Member] | Level 2 [Member]    
Derivative liabilities    
Foreign exchange 28 14
Derivatives designated as hedges [Member] | Accounts payable and accrued liabilities [Member] | Commodities [Member] | Level 2 [Member]    
Derivative liabilities    
Commodities 3 26
Derivatives designated as hedges [Member] | Other non-current liabilities [Member] | Foreign exchange [Member] | Level 2 [Member]    
Derivative liabilities    
Foreign exchange 1 5
Derivatives not designated as hedges [Member] | Other current assets [Member] | Commodities [Member] | Level 2 [Member]    
Derivative assets    
Commodities 5 3
Derivatives not designated as hedges [Member] | Accounts payable and accrued liabilities [Member] | Foreign exchange [Member] | Level 2 [Member]    
Derivative liabilities    
Foreign exchange 5 2
Derivatives not designated as hedges [Member] | Accounts payable and accrued liabilities [Member] | Commodities [Member] | Level 2 [Member]    
Derivative liabilities    
Commodities $ 0 $ 5