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Fair Value of Financial Instruments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair value information of assets and liabilities measured at fair value on a recurring basis
The following table presents comparative carrying value and fair value information for our financial assets and liabilities:
 
September 30, 2014
 
December 31, 2013
$ in millions
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
Trading
$
319

 
$
319

 
$
308

 
$
308

Available-for-sale
6

 
6

 
2

 
2

Derivatives
(1
)
 
(1
)
 
(2
)
 
(2
)
Long-term debt, including current portion
$
(5,929
)
 
$
(6,597
)
 
$
(5,930
)
 
$
(6,227
)