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Liabilities, Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Liabilities Commitments And Contingencies [Line Items]              
Amount by which estimated range of reasonably possible remediation costs exceeded recorded liabilities $ 1,077   $ 1,077 $ 1,077 $ 796    
Contingent liabilities on outstanding letters of credit agreements and surety bonds 3,769   3,769 3,769 3,761    
Cash surrender value of life insurance policies 448   448 448 466    
Total value of loans against underlying life insurance policies 431   431 431 447    
Liabilities, Current 97,312   97,312 97,312 81,590    
Revenue from Contract with Customer, Excluding Assessed Tax       (76,559) (101,127) $ (94,005)  
Commercial Aircraft Commitments [Member] | Total Contractual Trade In Value Maximum [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Other Commitment 1,407   1,407 1,407 1,519    
Commercial Aircraft Commitments [Member] | Net amounts payable to customers related to probable contractual trade-in commitments [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Other Commitment 711   711 711 522    
Commercial Aircraft Commitments [Member] | Probable Contractual Trade In Value [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Other Commitment 678   678 678 485    
Financing Commitment [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Other Commitment 13,377   13,377 13,377 $ 19,462    
joint venture [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Other Commitment             $ 246
KC-46A Tanker [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Contract Value 15,000   15,000 15,000      
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Loss Contingency, Estimate of Possible Loss 331   331 331      
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Loss Contingency, Estimate of Possible Loss 225   225 225      
B-737 [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Aircraft Program Costs, Increase       6,300      
Revenue from Contract with Customer, Excluding Assessed Tax     $ 2,649        
737 MAX storage, pilot training and software updates [Domain]              
Liabilities Commitments And Contingencies [Line Items]              
Additional expenses as a result of the 737 MAX grounding       328      
B737NG Structure (Picklefork) [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Interim Period, Costs Not Allocable Amount, Second Item       135      
Operating Segments | Commercial Airplanes | B-737-Max [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Proceeds from Insurance Settlement, Operating Activities       500      
Operating Segments | Commercial Airplanes | B-737-Max [Member] | Maximum [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Proceeds from Insurance Settlement, Operating Activities       500      
Customer Concessions [Member] | Operating Segments | Commercial Airplanes | B-737-Max [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Liabilities, Current   $ 6,110          
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,619 $ 5,610   8,259 [1]      
B-737-Max [Member] | Operating Segments | Commercial Airplanes | B-737-Max [Member]              
Liabilities Commitments And Contingencies [Line Items]              
Abnormal Production cost.       $ 4,000      
[1]
(1) 
Net of insurance recoveries