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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair value of assets and liabilities measured on a recurring basis
The following table presents comparative carrying value and fair value information for our financial assets and liabilities:
 
December 31, 2014
December 31, 2013
$ in millions
Carrying
Value
 
Fair
Value
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
 
Trading
 
$
331

 
$
331

 
$
308

 
$
308

Available-for-sale
 
5

 
5

 
2

 
2

Derivatives
 
1

 
1

 
(2
)
 
(2
)
Long-term debt, including current portion
 
(5,928
)
 
(6,726
)
 
(5,930
)
 
(6,227
)