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Basis of Presentation (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2014
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,
2014
 
December 31,
2013
Unamortized benefit plan costs, net of tax benefit of $1,888 as of September 30, 2014 and $1,972 as of December 31, 2013
$
(2,873
)
 
$
(3,000
)
Cumulative translation adjustment
(6
)
 
18

Net unrealized gain (loss) on marketable securities and cash flow hedges, net of tax
1

 
(2
)
Total accumulated other comprehensive loss
$
(2,878
)
 
$
(2,984
)