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Liabilities, Commitments And Contingencies (Narrative) (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
aircraft
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2011
USD ($)
Liabilities Commitments And Contingencies [Line Items]                    
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.             $ 14,000,000 $ (912,000,000) $ (224,000,000)  
Amount by which estimated range of reasonably possible remediation costs exceeded recorded liabilities     $ 857,000,000       868,000,000 857,000,000    
Contingent liabilities on outstanding letters of credit agreements and surety bonds     4,701,000,000       3,708,000,000 4,701,000,000    
Cash surrender value of life insurance policies     483,000,000       489,000,000 483,000,000    
Total value of loans against underlying life insurance policies     456,000,000       470,000,000 456,000,000    
Commercial Aircraft Commitments [Member] | Total Contractual Trade In Value Maximum [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Other Commitment     1,485,000,000       1,462,000,000 1,485,000,000    
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     126,000,000       155,000,000 126,000,000    
Commercial Aircraft Commitments [Member] | Probable Contractual Trade In Value [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Other Commitment     126,000,000       155,000,000 126,000,000    
Financing Commitment [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Other Commitment     14,847,000,000       10,221,000,000 14,847,000,000    
Financing Commitment [Member] | External Credit Rating, Non Investment Grade [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Other Commitment             $ 10,221,000,000      
Minimum [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Trade-In Commitment Expiration Date             2018      
Maximum [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Trade-In Commitment Expiration Date             2026      
F/A-18 Program [Member] | Capitalized Precontract Costs [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Loss Contingency, Estimate of Possible Loss             $ 155,000,000      
F/A-18 Program [Member] | Potential Termination Liabilities [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Loss Contingency, Estimate of Possible Loss             855,000,000      
KC-46A Tanker [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Increase/(Decrease) in Earnings from operations due to change in accounting estimate. $ (329,000,000) $ (142,000,000) $ (312,000,000)   $ (573,000,000) $ (243,000,000) (471,000,000) (1,128,000,000) $ (835,000,000)  
KC-46A Tanker [Member] | Capitalized Precontract Costs [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Loss Contingency, Estimate of Possible Loss             347,000,000      
KC-46A Tanker [Member] | Potential Termination Liabilities [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Loss Contingency, Estimate of Possible Loss             1,024,000,000      
B747 aircraft [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Reach-forward loss on commercial aircraft         $ (1,188,000,000) $ (70,000,000)        
Commercial Crew [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Increase/(Decrease) in Earnings from operations due to change in accounting estimate.       $ 162,000,000            
EMD Contract [Member] | KC-46A Tanker [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Contract Value                   $ 4,900,000,000
Low Rate Initial Production [Member] | KC-46A Tanker [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Contract Value2               $ 2,800,000,000    
Ula [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Inventory Amount, Unpriced Change Orders for Long-term Contracts or Programs             $ 120,000,000      
U.S. Navy [Member] | F/A-18 Program [Member]                    
Liabilities Commitments And Contingencies [Line Items]                    
Number Of Aircraft Included Within Backlog | aircraft             26