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Business Dispositions and Discontinued Operations (Tables) (Unaudited)
3 Months Ended
Mar. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued operations income statement
Earnings for the former shipbuilding business and an adjustment to the gain from a previous divestiture recognized in the three months ended March 31, 2011, are reported as discontinued operations, as presented in the following table:
$ in millions
 
 
Sales
 

$1,646

Earnings from discontinued operations
 
59

Income tax expense
 
(26
)
Earnings, net of tax
 
33

Gain on divestiture, net of income tax expense of $1
 
1

Earnings from discontinued operations, net of tax
 

$ 34