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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2016
Dec. 31, 2018
Sep. 10, 2018
Jan. 27, 2017
Dec. 31, 2011
Commitments And Contingencies [Line Items]                  
Document Period End Date       Jun. 30, 2019          
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 1,099     $ 1,099   $ 796      
Letters of Credit Outstanding, Amount 3,704     3,704   3,761      
Financing Commitment [Member]                  
Commitments And Contingencies [Line Items]                  
Other Commitment 14,277     14,277   19,462      
joint venture [Member]                  
Commitments And Contingencies [Line Items]                  
Other Commitment 248     248          
Total Contractual Trade-In Commitment [Member] | Commercial Aircraft Commitments [Member]                  
Commitments And Contingencies [Line Items]                  
Other Commitment 1,456     1,456   1,519      
Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments [Member] | Commercial Aircraft Commitments [Member]                  
Commitments And Contingencies [Line Items]                  
Other Commitment 739     739   522      
Fair Value of Trade In Value of Aircraft [Member] | Commercial Aircraft Commitments [Member]                  
Commitments And Contingencies [Line Items]                  
Other Commitment 706     706   $ 485      
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]                  
Commitments And Contingencies [Line Items]                  
Loss Contingency, Estimate of Possible Loss 404     404          
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]                  
Commitments And Contingencies [Line Items]                  
Loss Contingency, Estimate of Possible Loss 1,104     1,104          
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  
TX-Trainer [Member]                  
Commitments And Contingencies [Line Items]                  
Loss on Contracts     $ 400            
MQ-25 [Member]                  
Commitments And Contingencies [Line Items]                  
Loss on Contracts     $ 291            
B-737 [Member]                  
Commitments And Contingencies [Line Items]                  
Aircraft Program Costs, Increase 1,748 $ 1,016              
Operating Segments [Member] | Commercial Airplanes Segment [Member] | B-737-Max [Member]                  
Commitments And Contingencies [Line Items]                  
Revenue from Contract with Customer, Excluding Assessed Tax (5,610)                
Estimated Insurance Recoveries 500                
Operating Segments [Member] | Commercial Airplanes Segment [Member] | Customer Concessions [Member] | B-737-Max [Member]                  
Commitments And Contingencies [Line Items]                  
Revenue from Contract with Customer, Excluding Assessed Tax $ (5,610)     $ (5,610)