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Risk Management - Foreign Currency Risk (Details)
$ in Millions
Jun. 29, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Derivative [Line Items]    
Number of net notional positions to buy or sell foreign currency disclosed (in number of positions) | position 5 5
Foreign Exchange Contract    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts $ (1,000) $ (819)
Foreign Exchange Contract | Euro | Long    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts (155) (89)
Foreign Exchange Contract | British pound | Long    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts (46) (139)
Foreign Exchange Contract | Canadian dollar | Long    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts (42)  
Foreign Exchange Contract | Canadian dollar | Short    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts   (39)
Foreign Exchange Contract | Australian dollar | Short    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts (107) (105)
Foreign Exchange Contract | Chinese renminbi | Short    
Derivative [Line Items]    
Notional amounts of outstanding foreign exchange contracts $ (55) $ (55)