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Inventories - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Inventories classified in Other assets $ 1,076 $ 1,117
Inventories Not Expected to be Sold Within One Year    
Inventory [Line Items]    
Inventories classified in Other assets 1,000 1,000
Inventories Produced in Preparation for Product Launches    
Inventory [Line Items]    
Inventories classified in Other assets $ 80 $ 80