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Inventories - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Inventory [Line Items]    
Inventories classified in Other assets $ 2,495 $ 2,194
Inventories Not Expected to be Sold Within One Year    
Inventory [Line Items]    
Inventories classified in Other assets 2,100 1,900
Inventories Produced in Preparation for Product Launches    
Inventory [Line Items]    
Inventories classified in Other assets $ 327 $ 256