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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign currency exchange forward contracts - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional amount $ 5,871 $ 3,899
Maximum term 548 days 548 days
Derivative, fair value, net $ (21) $ 27
Other current assets    
Derivative [Line Items]    
Derivative asset 15 41
Other noncurrent assets    
Derivative [Line Items]    
Derivative asset 1 4
Other current liabilities    
Derivative [Line Items]    
Derivative liability (36) (16)
Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liability (1) (2)
Designated as Hedging Instrument    
Derivative [Line Items]    
Notional amount 1,104 1,058
Derivative, fair value, net 4 17
Designated as Hedging Instrument | Other current assets    
Derivative [Line Items]    
Derivative asset 11 24
Designated as Hedging Instrument | Other noncurrent assets    
Derivative [Line Items]    
Derivative asset 1 4
Designated as Hedging Instrument | Other current liabilities    
Derivative [Line Items]    
Derivative liability (7) (9)
Designated as Hedging Instrument | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liability (1) (2)
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional amount 4,767 2,841
Derivative, fair value, net (25) 10
Not Designated as Hedging Instrument | Other current assets    
Derivative [Line Items]    
Derivative asset 4 17
Not Designated as Hedging Instrument | Other noncurrent assets    
Derivative [Line Items]    
Derivative asset 0 0
Not Designated as Hedging Instrument | Other current liabilities    
Derivative [Line Items]    
Derivative liability (29) (7)
Not Designated as Hedging Instrument | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liability $ 0 $ 0