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Acquisitions and Divestitures (Acquisitions) (Details Textual)
company in Thousands, shares in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
USD ($)
Jun. 29, 2012
USD ($)
Mar. 31, 2014
country
company
Aug. 31, 2013
USD ($)
shares
Jun. 30, 2013
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2003
Business Acquisition [Line Items]                      
Acquisitions, including contingent payments, net of cash acquired           $ 2 $ 16 $ 71 $ 47 $ 177  
Acquisitions, net of cash acquired               82 273    
Minimum number of companies represented in broad market indices | company     11                
Minimum number of countries represented in broad market indices | country     52                
Payments for previous acquisition               $ 11      
Amortization period for intangible assets               5 years      
Ownership percentage                     45.00%
Fair value of business acquired   $ 792           $ 0 0 $ 792  
Deferred tax liabilities, noncurrent           $ 87   $ 56 $ 206    
Minimum [Member]                      
Business Acquisition [Line Items]                      
Amortization period of intangible assets (in years)                   5 years  
Maximum [Member]                      
Business Acquisition [Line Items]                      
Amortization period for intangible assets               7 years      
Amortization period of intangible assets (in years)                 20 years 20 years  
DJI [Member]                      
Business Acquisition [Line Items]                      
Fair value of business acquired $ 792                    
Deferred tax liabilities, noncurrent   $ 216                  
DJI [Member] | Minimum [Member]                      
Business Acquisition [Line Items]                      
Fair value estimates of proportionate shares of contributed businesses, assumptions, discount rates   10.00%                  
Fair value estimates of proportionate shares of contributed businesses, assumptions, long term growth rates   2.50%                  
DJI [Member] | Maximum [Member]                      
Business Acquisition [Line Items]                      
Fair value estimates of proportionate shares of contributed businesses, assumptions, discount rates   11.00%                  
Fair value estimates of proportionate shares of contributed businesses, assumptions, long term growth rates   3.50%                  
S&P Dow Jones LLC [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest in joint venture                   73.00%  
S&P/DJ Indices [Member]                      
Business Acquisition [Line Items]                      
Acquisition-related costs                 $ 15    
CRISIL Limited [Member]                      
Business Acquisition [Line Items]                      
Offer to purchase additional equity percent         22.23%            
Shares acquired | shares       11              
Percent of total shares acquired       15.07%              
Consideration for shares       $ 214              
Ownership percentage       67.84% 52.77%            
Contingent purchase price payment                 $ 12    
CME Group [Member] | S&P/DJ Indices [Member]                      
Business Acquisition [Line Items]                      
Noncontrolling interest ownership by noncontrolling owners 27.00%         27.00%