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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Dec. 31, 2016
Dec. 31, 2018
Sep. 10, 2018
Jan. 27, 2017
Dec. 31, 2011
Commitments And Contingencies [Line Items]              
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 1,090     $ 796      
Letters of Credit Outstanding, Amount 3,828     3,761      
Financing Commitment [Member]              
Commitments And Contingencies [Line Items]              
Other Commitment 18,265     19,462      
Total Contractual Trade-In Commitment [Member] | Commercial Aircraft Commitments [Member]              
Commitments And Contingencies [Line Items]              
Other Commitment 1,504     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 511     522      
Fair Value of Trade In Value of Aircraft [Member] | Commercial Aircraft Commitments [Member]              
Commitments And Contingencies [Line Items]              
Other Commitment 477     $ 485      
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]              
Commitments And Contingencies [Line Items]              
Loss Contingency, Estimate of Possible Loss 383            
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]              
Commitments And Contingencies [Line Items]              
Loss Contingency, Estimate of Possible Loss 784            
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 $ 1,016