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Acquisitions and Divestitures - Acquisitions Narrative (Details)
12 Months Ended
Sep. 01, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
sector
Aug. 31, 2017
Jun. 30, 2017
USD ($)
Jun. 30, 2016
Aug. 31, 2015
USD ($)
Aug. 18, 2015
USD ($)
Business Acquisition [Line Items]                  
Cash paid for acquisitions, net of cash acquired   $ 83,000,000 $ 177,000,000 $ 2,400,000,000          
Payments for previous acquisition   $ 0 $ 39,000,000 $ 5,000,000          
Maximum                  
Business Acquisition [Line Items]                  
Amortization period for intangible assets (in years)       18 years          
Senior Notes                  
Business Acquisition [Line Items]                  
Debt face amount               $ 2,000,000,000.0 $ 2,000,000,000.0
Algomi Limited                  
Business Acquisition [Line Items]                  
Cost method investment ownership percentage         6.02%        
CARE Ratings Limited                  
Business Acquisition [Line Items]                  
Cost method investment ownership percentage           8.90%      
Investments           $ 54,000,000      
Kensho Technologies                  
Business Acquisition [Line Items]                  
Cost method investment ownership percentage     2.54%            
TRIS Rating Company Limited                  
Business Acquisition [Line Items]                  
Equity method investment, ownership percentage             49.00%    
PIRA Energy Group                  
Business Acquisition [Line Items]                  
Payments for previous acquisition     $ 34,000,000            
UCG                  
Business Acquisition [Line Items]                  
Payments for previous acquisition     $ 5,000,000 $ 5,000,000          
SNL Financial LC                  
Business Acquisition [Line Items]                  
Fair value of business acquired $ 2,200,000,000                
Number of sectors in global economy served by acquiree | sector       5          
Acquisition-related costs       $ 37,000,000          
SNL Financial LC | Minimum                  
Business Acquisition [Line Items]                  
Amortization period of acquired intangible assets (in years)       10 years          
SNL Financial LC | Maximum                  
Business Acquisition [Line Items]                  
Amortization period of acquired intangible assets (in years)       18 years          
Series of Individually Immaterial Business Acquisitions | Minimum                  
Business Acquisition [Line Items]                  
Amortization period of acquired intangible assets (in years)     3 years            
Series of Individually Immaterial Business Acquisitions | Maximum                  
Business Acquisition [Line Items]                  
Amortization period of acquired intangible assets (in years)     10 years