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Fair Value Measurements and Financial Instruments - Fair Value of Derivative Instruments and Other Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Designated derivative instruments    
Derivative assets, designated $ 34 $ 25
Derivative liabilities, designated 58 73
Other financial instruments    
Total other financial instruments 83 14
Other current assets    
Other financial instruments    
Marketable securities 83 14
Other current assets | Interest rate swap contracts    
Designated derivative instruments    
Derivative assets, designated 0 0
Other current assets | Foreign currency contracts    
Designated derivative instruments    
Derivative assets, designated 34 25
Other current assets | Commodity contracts    
Designated derivative instruments    
Derivative assets, designated 0 0
Other assets | Interest rate swap contracts    
Designated derivative instruments    
Derivative assets, designated 0 0
Other assets | Foreign currency contracts    
Designated derivative instruments    
Derivative assets, designated 0 0
Other accruals | Interest rate swap contracts    
Designated derivative instruments    
Derivative liabilities, designated 4 0
Other accruals | Foreign currency contracts    
Designated derivative instruments    
Derivative liabilities, designated 10 20
Other accruals | Commodity contracts    
Designated derivative instruments    
Derivative liabilities, designated 0 0
Other liabilities | Interest rate swap contracts    
Designated derivative instruments    
Derivative liabilities, designated 14 7
Other liabilities | Foreign currency contracts    
Designated derivative instruments    
Derivative liabilities, designated $ 30 $ 46