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Business Dispositions (Tables)
12 Months Ended
Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations, Income Statement Disclosures
Earnings for the former shipbuilding business and an adjustment to the gain from a previous divestiture, are reported as discontinued operations, as presented in the following table:
 
 
Year Ended December 31,
$ in millions
 
2011
Sales
 

$1,646

Earnings from discontinued operations
 
59

Income tax expense
 
(28
)
Earnings, net of tax
 
31

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

Earnings from discontinued operations, net of tax
 

$ 32