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Commitments And Contingencies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Termination Of A-12 Program [Member]
Jan. 31, 1991
Termination Of A-12 Program [Member]
Dec. 31, 2011
International Subsidiaries [Member]
Commitments And Contingencies [Line Items]            
Maximum amount contractors collectively would be required to repay the government         $ 1,400,000,000  
Interest and maximum amount contractors collectively would be required to pay the government       1,400,000,000    
Interest on maximum amount contractors collectively would be required to pay the government       1,600,000,000    
Loss contingency, maximum liability, pretax       1,500,000,000    
Discontinued operations charge, after-tax 830,000,000          
Discontinued operations charge, per share, after-tax $ 2.31          
Cash cost, after-tax       735,000,000    
Total rental expenses under operating leases 274,000,000 258,000,000 258,000,000      
Letters of credit $ 1,400,000,000         $ 1,100,000,000
Concentration Risk, Labor Subject To Collective Bargaining Arrangements

Labor Agreements. Approximately one-fifth of our employees and our subsidiaries' employees are represented by labor organizations and work under local works council agreements and 51 company-negotiated agreements. A number of these agreements expire within any given year. Historically, we have been successful at renegotiating successor agreements without any material disruption of operating activities. We expect to renegotiate the terms of 10 collective agreements in 2012, covering approximately 5,000 employees. We do not expect the renegotiations will, either individually or in the aggregate, have a material impact on our results of operations, financial condition or cash flows.

         
Contract termination       In January 1991, the U.S. Navy terminated the contract for default and demanded the contractors repay $1.4 billion in unliquidated progress payments. Following the termination, the Navy agreed to defer the collection of that amount pending a negotiated settlement or other resolution. Both contractors had full responsibility to the Navy for performance under the contract, and both are jointly and severally liable for potential liabilities arising from the termination.