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Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) $ 4 $ 0 $ 8 $ (1)
Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0 0 0 0
Gain (Loss) Recognized in Earnings (Loss) (2) 0 15 (2)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0 0 0 0
Gain (Loss) Recognized in Earnings (Loss) (2) 0 15 (2)
Cash Flow Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 4 0 9 0
Gain (Loss) Recognized in Earnings (Loss) 0 0 1 2
Cash Flow Hedging [Member] | Commodity Contract [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 2 0 6 1
Gain (Loss) Recognized in Earnings (Loss) 0 1 1 3
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 0 0 1 (1)
Gain (Loss) Recognized in Earnings (Loss) 0 (1) 0 (1)
Cash Flow Hedging [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 2 0 2 0
Gain (Loss) Recognized in Earnings (Loss) 0 0 0 0
Net Investment Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 9 (30) 44 (99)
Gain (Loss) Recognized in Earnings (Loss) 0 0 0 0
Foreign Currency Denominated Debt [Member] | Net Investment Hedging [Member]        
Derivative [Line Items]        
Gain (Loss) Recognized in Other Comprehensive Income (Loss) 9 (30) 44 (99)
Gain (Loss) Recognized in Earnings (Loss) $ 0 $ 0 $ 0 $ 0