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Fair Value Measurements and Financial Instruments - Schedule of Gain (Loss) Included in OCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI $ (1)   $ (3)  
Gain (loss) recognized in OCI   $ 16   $ 8
Foreign Currency Contracts        
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI (2)   (5)  
Gain (loss) recognized in OCI   14   6
Net investment hedges [Abstract]        
Gain (loss) on instruments (7)   (1)  
Gain (loss) on instruments   43   25
Gain (loss) on hedged items 7   1  
Gain (loss) on hedged items   (41)   (23)
Commodity Contracts        
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 1   2  
Gain (loss) recognized in OCI   0   0
Foreign Currency Debt        
Net investment hedges [Abstract]        
Gain (loss) on instruments (24)   5  
Gain (loss) on instruments   78   59
Gain (loss) on hedged items $ 24   $ (5)  
Gain (loss) on hedged items   $ (78)   $ (59)