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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, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional Amount $ 5,770 $ 6,336
Maximum term in days 586 days 586 days
Derivative, Fair Value, Net $ 79 $ 57
Other current assets    
Derivative [Line Items]    
Derivative assets 102 43
Other noncurrent assets    
Derivative [Line Items]    
Derivative assets 1 34
Other current liabilities    
Derivative [Line Items]    
Derivative liabilities (23) (20)
Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liabilities (1)  
Designated    
Derivative [Line Items]    
Notional Amount 842 870
Derivative, Fair Value, Net 1 11
Designated | Other current assets    
Derivative [Line Items]    
Derivative assets 9 15
Designated | Other noncurrent assets    
Derivative [Line Items]    
Derivative assets 1 1
Designated | Other current liabilities    
Derivative [Line Items]    
Derivative liabilities (8) (5)
Designated | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liabilities (1)  
Non-Designated    
Derivative [Line Items]    
Notional Amount 4,928 5,466
Derivative, Fair Value, Net 78 46
Non-Designated | Other current assets    
Derivative [Line Items]    
Derivative assets 93 28
Non-Designated | Other noncurrent assets    
Derivative [Line Items]    
Derivative assets 0 33
Non-Designated | Other current liabilities    
Derivative [Line Items]    
Derivative liabilities (15) $ (15)
Non-Designated | Other noncurrent liabilities    
Derivative [Line Items]    
Derivative liabilities $ 0