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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
aircraft
Dec. 31, 2011
Liabilities Commitments And Contingencies [Line Items]    
Contingent liabilities on outstanding letters of credit agreements and surety bonds $ 4,621 $ 6,199
Expiration date of trade in commitment agreements, minimum 2012  
Expiration date of trade in commitment agreements, maximum 2023  
Number of C-17 Aircraft 2  
C-17 Program [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Loss contingency, estimate of possible loss 155  
C-17 Program [Member] | USAF [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Number of C-17 orders included in backlog 5  
C-17 Program [Member] | International [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Number of C-17 orders included in backlog 12  
Environmental Remediation Expense [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Amount by which estimated range of reasonably possible remediation costs exceeded recorded liabilities 925 1,003
Financing Commitment [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Other Commitment 17,998 15,866
Total Contractual Trade In Value Maximum [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Other Commitment 1,164 273
Probable Contractual Trade In Value [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Other Commitment 91 27
ULA Additional Capital Commitment [Member]
   
Liabilities Commitments And Contingencies [Line Items]    
Other Commitment $ 462