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Inventories - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
LIFO Inventory Amount $ 2,300 $ 2,400
Inventories classified in other assets 1,117 1,569
Inventory Not Expected to be Sold Within One Year    
Inventory [Line Items]    
Inventories classified in other assets 1,000 1,500
Inventories Produced in Preparation for Product Launches    
Inventory [Line Items]    
Inventories classified in other assets $ 80 $ 63