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Derivative and Other Financial Instruments (Fair Values of Outstanding Derivative Instruments in the Consolidated Balance Sheets) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Derivative assets    
Total $ 48 $ 45
Derivative liabilities    
Total 26 37
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Foreign Exchange [Member] | Designated as Hedging Instrument [Member]    
Derivative assets    
Derivatives designated as hedges, Foreign exchange 22 24
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]    
Derivative assets    
Derivatives designated as hedges, Commodities 18 13
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Commodities [Member] | Not Designated as Hedging Instrument [Member]    
Derivative assets    
Derivatives designated as hedges, Commodities 6 5
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Assets [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]    
Derivative assets    
Derivatives designated as hedges, Commodities 2 3
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange [Member] | Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives designated as hedges, Foreign exchange 16 28
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives not designated as hedges, Foreign exchange 0 5
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives designated as hedges, Commodities 7 3
Fair Value, Inputs, Level 2 [Member] | Accounts Payable and Accrued Liabilities [Member] | Commodities [Member] | Not Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives designated as hedges, Commodities 1 0
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member] | Commodities [Member] | Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives designated as hedges, Commodities 0 1
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Liabilities [Member] | Commodities [Member] | Not Designated as Hedging Instrument [Member]    
Derivative liabilities    
Derivatives designated as hedges, Commodities $ 2 $ 0