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Stock Compensation Plans and Other Compensation Arrangements (Details 3) (Outstanding Stock Awards, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Outstanding Stock Awards
       
Stock Award Activity (Table Amounts)        
Stock awards - outstanding at January 1 3,622 4,300 3,658  
Stock awards - granted 1,860 1,748 2,317  
Stock awards - vested (1,800) (1,824) (1,319)  
Stock awards - forfeited (204) (350) (356)  
Stock Awards - Shipbuilding spin-off adjustments   (252)    
Stock awards - outstanding at December 31 3,478 3,622 4,300 3,658
Stock Awards, Weighted Average Grant Date Fair Value [Roll Forward]        
Weighted-average grant date fair value - outstanding at January 1 $ 58 $ 53 $ 58  
Weighted-average grant date fair value - granted $ 60 $ 63 $ 60  
Weighted-average grant date fair value - vested $ 55 $ 42 $ 79  
Weighted-average grant date fair value - forfeited $ 59 $ 50 $ 56  
Weighted-average grant date fair value - Shipbuilding spin-off adjustments   $ 47    
Weighted-average grant date fair value - outstanding at December 31 $ 61 $ 58 $ 53 $ 58
Weighted-average remaining contractual term - outstanding 1 year 7 months 9 days 1 year 7 months 9 days 1 year 6 months 2 days 1 year 7 months 9 days