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Inventories (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Long-term contracts in progress $ 966 $ 2,129
Other Inventory, Gross 8,795 7,685
Airplane Program 787 [Member]    
Inventory [Line Items]    
Inventory, Work in Process, Gross 26,593 27,852
Amount of Deferred Costs Related to Long-term Contracts 19,825 22,967
Advances on Inventory Purchases 2,273 2,453
Unamortized Tooling 2,215 2,638
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 14,454  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 7,586  
Airplane Program 737 [Member]    
Inventory [Line Items]    
Amount of Deferred Costs Related to Long-term Contracts 1,481 463
Unamortized Tooling 522 471
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 1,999  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 4  
Ula [Member]    
Inventory [Line Items]    
Long-term contracts in progress 176 227
Capitalized Precontract Costs [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs 679 644
Early Issue Sales Consideration [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 2,767 $ 2,844