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Inventories (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory [Line Items]    
Long-term contracts in progress $ 871 $ 1,187
Airplane Program 787 [Member]    
Inventory [Line Items]    
Inventory, Work in Process, Gross 28,730 24,772
Amount of Deferred Costs Related to Long-term Contracts 15,432 18,716
Advances on Inventory Purchases 1,921 2,202
Unamortized Tooling 1,877 2,092
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 13,996  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 3,313  
Airplane Program 737 [Member]    
Inventory [Line Items]    
Amount of Deferred Costs Related to Long-term Contracts 1,852 1,313
Unamortized Tooling 512 521
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 2,305  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 59  
Airplane Program 777x [Member]    
Inventory [Line Items]    
Inventory, Work in Process, Gross 7,634 5,628
Unamortized Tooling 3,175 2,914
ULA    
Inventory [Line Items]    
Long-term contracts in progress 176 176
Capitalized Precontract Costs    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs 821 711
Early Issue Sales Consideration [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 2,960 $ 2,863