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Inventories (Narrative) (Details)
$ in Millions
Sep. 30, 2018
USD ($)
aircraft
Dec. 31, 2017
USD ($)
Inventory [Line Items]    
Long-term contracts in progress $ 1,908 $ 1,854
Other Inventory, Gross 6,562 6,673
Airplane Program 787 [Member]    
Inventory [Line Items]    
Inventory, Work in Process, Gross 28,905 30,695
Amount of Deferred Costs Related to Long-term Contracts 23,584 25,358
Advances on Inventory Purchases 2,485 3,189
Unamortized Tooling 2,774 3,173
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 19,786  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 6,572  
Airplane Program 747 [Member]    
Inventory [Line Items]    
Unamortized Tooling 125 151
Recovered Production Costs Excess Recoverable Under Existing Firm Orders $ 119  
Unsold Aircraft | aircraft 1  
Ula [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 120  
Long-term contracts in progress 227 284
Capitalized Precontract Costs [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs 663 933
Early Issue Sales Consideration [Member]    
Inventory [Line Items]    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 2,896 $ 2,976