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

$ 308

 

$ 308

 

$ 259

 

$ 259

Available-for-sale
 
2

 
2

 
3

 
3

Derivatives
 
(2
)
 
(2
)
 
(1
)
 
(1
)
Long-term debt, including current portion
 
(5,930
)
 
(6,227
)
 
(3,935
)
 
(4,834
)