v2.4.0.6
Business Segments (Schedule of Operating Segments) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Total revenues $ 744 $ 804  
Cost of revenues (326) (390)  
Revenues less transaction rebates, brokerage, clearance and exchange fees 418 414  
Operating income (loss) 90 171  
Assets 9,188   9,132
Market Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 508 580  
Cost of revenues (326) (390)  
Revenues less transaction rebates, brokerage, clearance and exchange fees 182 190  
Operating income (loss) 74 79  
Assets 4,970   4,981
Listing Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 55 56  
Revenues less transaction rebates, brokerage, clearance and exchange fees 55 56  
Operating income (loss) 24 22  
Assets 256   254
Information Services [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 108 102  
Revenues less transaction rebates, brokerage, clearance and exchange fees 108 102  
Operating income (loss) 81 75  
Assets 2,441   2,456
Technology Solutions [Member]
      
Segment Reporting Information [Line Items]      
Total revenues 73 66  
Revenues less transaction rebates, brokerage, clearance and exchange fees 73 66  
Operating income (loss) 2 5  
Assets 623   625
Corporate Items and Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Operating income (loss) (91) [1] (10) [1]  
Assets $ 898   $ 816
[1] Corporate items and eliminations for the three months ended March 31, 2013 primarily include expenses related to our voluntary accommodation program, expense related to an SEC matter, restructuring charges, merger and strategic initiatives expense and special legal expenses. Corporate items and eliminations for the three months ended March 31, 2012 primarily include restructuring charges and merger and strategic initiatives expense.