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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2016
Sep. 27, 2019
Dec. 31, 2018
Sep. 10, 2018
Jan. 27, 2017
Dec. 31, 2011
Commitments And Contingencies [Line Items]                      
Document Period End Date         Sep. 30, 2019            
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 1,064       $ 1,064     $ 796      
Letters of Credit Outstanding, Amount 3,598       3,598     3,761      
Liabilities, Current 91,846       91,846     81,590      
Financing Commitment [Member]                      
Commitments And Contingencies [Line Items]                      
Other Commitment 15,607       15,607     19,462      
joint venture [Member]                      
Commitments And Contingencies [Line Items]                      
Other Commitment 246       246            
Total Contractual Trade-In Commitment [Member] | Commercial Aircraft Commitments [Member]                      
Commitments And Contingencies [Line Items]                      
Other Commitment 1,421       1,421     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 723       723     522      
Fair Value of Trade In Value of Aircraft [Member] | Commercial Aircraft Commitments [Member]                      
Commitments And Contingencies [Line Items]                      
Other Commitment 690       690     $ 485      
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]                      
Commitments And Contingencies [Line Items]                      
Loss Contingency, Estimate of Possible Loss 304       304            
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]                      
Commitments And Contingencies [Line Items]                      
Loss Contingency, Estimate of Possible Loss 150       150            
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                   $ 2,100  
KC-46A Tanker [Member] | LRIP 4 [Member] [Domain]                      
Commitments And Contingencies [Line Items]                      
Contract Value                 $ 2,900    
KC-46A Tanker [Member] | LRIP 5 [Member] [Domain]                      
Commitments And Contingencies [Line Items]                      
Contract Value             $ 2,600        
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 872 $ 1,748 $ 1,016                
Operating Segments [Member] | Commercial Airplanes Segment [Member] | B-737-Max [Member]                      
Commitments And Contingencies [Line Items]                      
Estimated Insurance Recoveries 500                    
Proceeds from Insurance Settlement, Operating Activities 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) [1]            
Liabilities, Current 6,110       $ 6,110            
Payments, concessions and other in-kind considerations to customers $ 252                    
[1]
Net of insurance recoveries