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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Commitments And Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 1,077   $ 1,077
Letters of Credit Outstanding, Amount 4,092   3,769
Abnormal Production cost. 797    
Increase/(Decrease) in Earnings from operations due to change in accounting estimate (839) $ 147  
Within Next Two fiscal Years [Member]      
Commitments And Contingencies [Line Items]      
Abnormal Production cost. 5,000    
Financing Commitment [Member]      
Commitments And Contingencies [Line Items]      
Other Commitment 13,176   13,377
joint venture [Member]      
Commitments And Contingencies [Line Items]      
Other Commitment 243    
Total Contractual Trade-In Commitment [Member] | Commercial Aircraft Commitments [Member]      
Commitments And Contingencies [Line Items]      
Other Commitment 1,230   1,407
Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments [Member] | Commercial Aircraft Commitments [Member]      
Commitments And Contingencies [Line Items]      
Other Commitment 673   711
Fair Value of Trade In Value of Aircraft [Member] | Commercial Aircraft Commitments [Member]      
Commitments And Contingencies [Line Items]      
Other Commitment 639   678
KC-46A Tanker [Member]      
Commitments And Contingencies [Line Items]      
Contract Value 15,000    
Increase/(Decrease) in Earnings from operations due to change in accounting estimate 827    
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]      
Commitments And Contingencies [Line Items]      
Loss Contingency, Estimate of Possible Loss 338    
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]      
Commitments And Contingencies [Line Items]      
Loss Contingency, Estimate of Possible Loss 373    
KC-46A Tanker Remote Vision System [Member]      
Commitments And Contingencies [Line Items]      
Increase/(Decrease) in Earnings from operations due to change in accounting estimate 551    
737 MAX storage, pilot training and software updates [Domain]      
Commitments And Contingencies [Line Items]      
Additional expenses as a result of the 737 MAX grounding 61    
B-737 [Member]      
Commitments And Contingencies [Line Items]      
Aircraft Program Costs, Increase     6,300
Abnormal Production cost, increase 1,000    
B737NG Structure (Picklefork) [Member]      
Commitments And Contingencies [Line Items]      
Cost of Goods and Services Sold $ 336   $ 135