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Inventories (Inventory Disclosure Table) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Long-term contracts in progress $ 708 $ 823
Commercial aircraft programs 70,672 70,153
Commercial spare parts, used aircraft, general stock materials and other 10,419 10,739
Total $ 81,799 $ 81,715