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

$ 259

 

$ 259

 
 

$ 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
 
(3,935
)
 
(4,834
)
 
 
(3,940
)
 
(4,675
)