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Basis of Presentation (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
$ in millions
September 30,
2013
 
December 31,
2012
Unamortized benefit plan costs, net of tax benefit of $2,990 as of September 30, 2013, and $3,149 as of December 31, 2012
            $
(4,553
)
 
            $
(4,790
)
Cumulative translation adjustment
12

 
4

Net unrealized loss on marketable securities and cash flow hedges, net of tax benefit
(2
)
 
(1
)
Total accumulated other comprehensive loss
            $
(4,543
)
 
            $
(4,787
)