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Inventory (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Work in process $ 4,510 $ 4,357
Raw materials 1,535 1,504
Finished goods 45 33
Pre-owned aircraft 95 83
Total inventories $ 6,185 $ 5,977