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Acquisitions and Divestitures (Schedule Of 2012 Acquisition) (Details)
In Millions, unless otherwise specified
3 Months Ended
May 31, 2012
USD ($)
Sep. 30, 2012
NOS Clearing [Member]
USD ($)
Dec. 31, 2012
NOS Clearing [Member]
USD ($)
Jul. 31, 2012
NOS Clearing [Member]
USD ($)
Jul. 31, 2012
NOS Clearing [Member]
NOK
Dec. 31, 2012
BWise [Member]
USD ($)
May 31, 2012
BWise [Member]
USD ($)
May 31, 2012
BWise [Member]
EUR (€)
Business Acquisition [Line Items]                
Purchase consideration     $ 40 [1] $ 40 233 $ 77 $ 77 € 62
Total Net Assets (liabilities) Acquired     43 [1] 43   (11) (11)  
Purchased Intangible Assets 35   1 [1] 1   35 35  
Goodwill           53    
Gain on acquisition   $ 4            
[1] In the third quarter of 2012, we recognized a gain of $4 million on our acquisition of NOS Clearing.