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Inventories (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Inventory [Line Items]      
Long-term contracts in progress $ 913   $ 823
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate (176) $ (839)  
Airplane Program 787 [Member]      
Inventory [Line Items]      
Amount of Deferred Costs Related to Long-term Contracts 14,803   14,976
Advances on Inventory Purchases 1,795   1,865
Unamortized Tooling 1,857   1,863
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 11,557    
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 5,103    
Airplane Program 737 [Member]      
Inventory [Line Items]      
Amount of Deferred Costs Related to Long-term Contracts 1,861   2,159
Unamortized Tooling 632   480
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 2,391    
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 102    
Airplane Program 777x [Member]      
Inventory [Line Items]      
Unamortized Tooling 3,351   3,295
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 571   733
Early Issue Sales Consideration [Member]      
Inventory [Line Items]      
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 3,114   $ 2,992