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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Fair value information of assets and liabilities measured at fair value on a recurring basis
The following table presents fair value information for those assets and liabilities measured at fair value on a recurring basis:
 
March 31, 2013
 
December 31, 2012
$ in millions
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
Trading

$ 270

 

$ 270

 

$ 259

 

$ 259

Available-for-sale
2

 
2

 
3

 
3

Derivatives
1

 
1

 
(1
)
 
(1
)
Long-term debt, including current portion
     $
(3,942
)
 
     $
(4,787
)
 
     $
(3,935
)
 
     $
(4,834
)