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Retirement Plans (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2012
plan
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Pension Benefits
Dec. 31, 2011
Pension Benefits
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit
Dec. 31, 2012
Noncontributory [Member]
Government Business Employees [Member]
plan
Dec. 31, 2012
Noncontributory [Member]
Commercial Business Employees [Member]
plan
Dec. 31, 2012
Contributory [Member]
Government Business Employees [Member]
plan
Dec. 31, 2012
Contributory [Member]
Commercial Business Employees [Member]
plan
Dec. 31, 2012
CAS/PPA Harmonization Rules [Member]
Pension Benefits
Compensation And Retirement Disclosure Line Items                      
Defined contribution plan, cost recognized $ 201,000,000 $ 203,000,000 $ 198,000,000 $ 532,000,000   $ 32,000,000          
Common stock, shares held in employee trust, shares 31 33                  
Percentage of defined contribution plans held from outstanding shares 9.00% 10.00%                  
Number of defined benefit pension plans             6 2 6 4  
Amendments 155,000,000                    
Number of non-qualified supplemental executive plans 1                    
Voluntary contribution to pension plan 100,000,000                    
Expected contribution to defined benefit contribution plans       600,000,000   29,000,000          
CAS equitable adjustment                     165,000,000
Period in which the difference between the actual and expected return on plan assets for qualified plans are recognized in years 5 years                    
Defined benefit plan, accumulated benefit obligation       11,500,000,000 9,800,000,000            
Defined benefit plan, effect of one percentage point increase on service and interest cost components 6,000,000                    
Defined benefit plan, effect of one percentage point decrease on service and interest cost components (5,000,000)                    
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 118,000,000                    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (96,000,000)                    
Percentage of pension plan assets held in a single trust for primary domestic government and commercial pension plans 90.00%