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Fair Value of Financial Instruments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015
 
December 31, 2014
$ in millions
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
Trading
$
295

 
$
295

 
$
331

 
$
331

Available-for-sale
5

 
5

 
5

 
5

Derivatives
4

 
4

 
1

 
1

Long-term debt, including current portion
$
(6,527
)
 
$
(7,041
)
 
$
(5,928
)
 
$
(6,726
)