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Acquisitions and Divestitures (Acquisitions) (Details Textual) (USD $)
In Millions, unless otherwise specified
0 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended
Jun. 29, 2012
Sep. 30, 2012
Sep. 30, 2011
Jun. 29, 2012
DJI [Member]
Sep. 30, 2012
DJI [Member]
Minimum [Member]
Sep. 30, 2012
DJI [Member]
Maximum [Member]
Sep. 30, 2012
S&P/DJ Indices [Member]
Jun. 29, 2012
CGIS And CME Group [Member]
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Net of Cash Acquired   $ 162 $ 199          
Deferred tax liabilities, noncurrent       216        
Percentage of interest in joint venture 73.00%             27.00%
Acquistiion-related costs             15  
Fair value of business acquired       $ 792        
Fair value estimates of proportionate shares of contributed businesses, assumptions, discount rates         10.00% 11.00%    
Fair value estimates of proportionate shares of contributed businesses, assumptions, long term growth rates         2.50% 3.50%