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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015
December 31, 2014
$ in millions
Carrying
Value
 
Fair
Value
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
 
Trading
 
$
303

 
$
303

 
$
331

 
$
331

Available-for-sale
 
7

 
7

 
5

 
5

Derivatives
 
5

 
5

 
1

 
1

Long-term debt, including current portion
 
(6,526
)
 
(6,907
)
 
(5,928
)
 
(6,726
)