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Liabilities, Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 10, 2018
Jan. 27, 2017
Dec. 31, 2011
Liabilities Commitments And Contingencies [Line Items]                        
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.             $ (190) $ 250 $ (263)      
Amount by which estimated range of reasonably possible remediation costs exceeded recorded liabilities $ 796           796 868        
Contingent liabilities on outstanding letters of credit agreements and surety bonds 3,761           3,761 3,708        
Cash surrender value of life insurance policies 466           466 489        
Total value of loans against underlying life insurance policies 447           447 470        
Commercial Aircraft Commitments [Member] | Total Contractual Trade In Value Maximum [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Other Commitment 1,519           1,519 1,462        
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 522           522 155        
Commercial Aircraft Commitments [Member] | Probable Contractual Trade In Value [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Other Commitment 485           485 155        
Financing Commitment [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Other Commitment 19,462           19,462 10,221        
Financing Commitment [Member] | External Credit Rating, Non Investment Grade [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Other Commitment 18,785           18,785          
MQ-25 [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Loss on Contracts   $ 291                    
KC-46A Tanker [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Increase/(Decrease) in Earnings from operations due to change in accounting estimate. (50) (179) $ (426) $ (81) $ (314) $ (138) (736) $ (445) (1,127)      
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Loss Contingency, Estimate of Possible Loss 370           370          
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Loss Contingency, Estimate of Possible Loss $ 550           $ 550          
EMD Contract [Member] | KC-46A Tanker [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Contract Value                       $ 4,900
Low Rate Initial Production [Member] | KC-46A Tanker [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Contract Value                   $ 2,900 $ 2,100  
Contract Value2                 $ 2,800      
TX-Trainer [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Loss on Contracts   400                    
MQ-25 [Member]                        
Liabilities Commitments And Contingencies [Line Items]                        
Loss on Contracts   $ 291