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Inventory (Details) - USD ($)
$ in Millions
Jul. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Work in process $ 4,385 $ 3,872
Raw materials 1,381 1,357
Finished goods 49 51
Pre-owned aircraft 75 23
Total inventories $ 5,890 $ 5,303