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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Sep. 30, 2018
Sep. 10, 2018
Dec. 31, 2017
Jan. 27, 2017
Dec. 31, 2011
Commitments And Contingencies [Line Items]            
Loss Contingency, Range of Possible Loss, Portion Not Accrued   $ 800   $ 868    
Letters of Credit Outstanding, Amount   3,762   3,708    
Financing Commitment [Member]            
Commitments And Contingencies [Line Items]            
Other Commitment   19,744   10,221    
Total Contractual Trade-In Commitment [Member] | Commercial Aircraft Commitments [Member]            
Commitments And Contingencies [Line Items]            
Other Commitment   1,726   1,462    
Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments [Member] | Commercial Aircraft Commitments [Member]            
Commitments And Contingencies [Line Items]            
Other Commitment   371   155    
Fair Value of Trade In Value of Aircraft [Member] | Commercial Aircraft Commitments [Member]            
Commitments And Contingencies [Line Items]            
Other Commitment   361   $ 155    
Ula [Member]            
Commitments And Contingencies [Line Items]            
Inventory subject to uncertainty   120        
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]            
Commitments And Contingencies [Line Items]            
Loss Contingency, Estimate of Possible Loss   368        
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]            
Commitments And Contingencies [Line Items]            
Loss Contingency, Estimate of Possible Loss   $ 1,341        
KC-46A Tanker [Member] | EMD Contract            
Commitments And Contingencies [Line Items]            
Contract Value           $ 4,900
KC-46A Tanker [Member] | Low Rate Initial Production [Member]            
Commitments And Contingencies [Line Items]            
Contract Value2 $ 2,800          
KC-46A Tanker [Member] | LRIP 3 [Member]            
Commitments And Contingencies [Line Items]            
Contract Value     $ 2,900   $ 2,100