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Derivative Instruments (Forward Currency Exchange Contracts) (Details) - Foreign Exchange Contract - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional Amount $ 4,298 $ 3,899
Maximum Term (Days) 548 days 548 days
Derivative, Fair Value, Net $ (17) $ 27
Other current assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 19 41
Other noncurrent assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1 4
Other current liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability (37) (16)
Other noncurrent liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 (2)
Designated    
Derivative [Line Items]    
Notional Amount 1,123 1,058
Derivative, Fair Value, Net (1) 17
Designated | Other current assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 15 24
Designated | Other noncurrent assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1 4
Designated | Other current liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability (17) (9)
Designated | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability 0 (2)
Non-Designated    
Derivative [Line Items]    
Notional Amount 3,175 2,841
Derivative, Fair Value, Net (16) 10
Non-Designated | Other current assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 4 17
Non-Designated | Other noncurrent assets    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Non-Designated | Other current liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability (20) (7)
Non-Designated | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 0 $ 0