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Fair Value of Financial Instruments (Unaudited) (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Fair value information of assets and liabilities measured at fair value on a recurring basis
The following table presents fair value information for those assets and liabilities measured at fair value on a recurring basis:
 
September 30, 2012
 
December 31, 2011
$ in millions
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
Financial Assets (Liabilities)
 
 
 
 
 
 
 
Marketable securities
 
 
 
 
 
 
 
Trading

$ 249

 

$ 249

 

$ 219

 

$ 219

Available-for-sale
3

 
3

 
4

 
4

Held-to-maturity time deposits

 

 
250

 
250

Derivatives
1

 
1

 
7

 
7

Long-term debt, including current portion
(3,936
)
 
(4,902
)
 
(3,940
)
 
(4,675
)