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Inventories (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Inventory [Line Items]          
Long-term contracts in progress $ 708 $ 823   $ 708  
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate (234)   $ (90) (58) $ 749
Airplane Program 787 [Member]          
Inventory [Line Items]          
Amount of Deferred Costs Related to Long-term Contracts 14,927 14,976   14,927  
Advances on Inventory Purchases 1,732 1,865   1,732  
Unamortized Tooling 1,812 1,863   1,812  
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 12,131     12,131  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 4,608     4,608  
Airplane Program 737 [Member]          
Inventory [Line Items]          
Amount of Deferred Costs Related to Long-term Contracts 1,965 2,159   1,965  
Unamortized Tooling 625 480   625  
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 2,386     2,386  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 204     204  
Airplane Program 777x [Member]          
Inventory [Line Items]          
Unamortized Tooling 3,386 3,295   3,386  
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate   6,493      
Capitalized Precontract Costs          
Inventory [Line Items]          
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs 605 733   605  
Early Issue Sales Consideration [Member]          
Inventory [Line Items]          
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 3,319 $ 2,992   $ 3,319