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Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Work in process $ 4,749 $ 4,357
Raw materials 1,587 1,504
Finished goods 25 33
Pre-owned aircraft 119 83
Total inventories $ 6,480 $ 5,977