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Inventories (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Inventory [Line Items]          
Long-term contracts in progress $ 578 $ 823   $ 578  
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate 142   $ 38 84 $ 787
Cumulative Scenario [Member]          
Inventory [Line Items]          
Abnormal Production cost.       4,600  
Airplane Program 787 [Member]          
Inventory [Line Items]          
Amount of Deferred Costs Related to Long-term Contracts 15,153 14,976   15,153  
Advances on Inventory Purchases 1,808 1,865   1,808  
Unamortized Tooling 1,814 1,863   1,814  
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 11,643     11,643  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 5,324     5,324  
Abnormal Production cost. 183        
Airplane Program 787 [Member] | Cumulative Scenario [Member]          
Inventory [Line Items]          
Abnormal Production cost.       1,000  
Airplane Program 787 [Member] | Remaining Scenario [Member]          
Inventory [Line Items]          
Abnormal Production cost.       800  
Airplane Program 737 [Member]          
Inventory [Line Items]          
Amount of Deferred Costs Related to Long-term Contracts 1,676 2,159   1,676  
Unamortized Tooling 619 480   619  
Recovered Production Costs Excess Recoverable Under Existing Firm Orders 2,276     2,276  
Unrecovered Production Costs, Excess Unrecoverable under Existing Firm Orders 19     19  
Airplane Program 777x [Member]          
Inventory [Line Items]          
Unamortized Tooling 3,444 3,295   3,444  
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 646 733   646  
Early Issue Sales Consideration [Member]          
Inventory [Line Items]          
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs $ 3,238 $ 2,992   $ 3,238