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Equity - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 25, 2018
Mar. 06, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased     700,000 2,800,000 5,700,000 5,400,000  
Average price paid per share (USD per share)     $ 205.11 $ 0.00 $ 180.94 $ 133.01  
Minimum interest in joint venture (as a percent)         20.00%    
Agreement terms, change of control, put option for minority interest ownership, effective period         15 days    
2013 Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized for repurchase (shares)             50,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)             18.00%
Remaining shares available under repurchase program (shares)     13,300,000   13,300,000    
S&P Dow Jones LLC              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Noncontrolling interest ownership by noncontrolling owners (as a percent)     27.00%   27.00%    
Accelerated Share Repurchases, March 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized stock repurchase program amount   $ 1,000,000,000          
Payments for accelerated share repurchases   $ 1,000,000,000          
Initial Award | Accelerated Share Repurchases, March 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased   4,500,000          
Accelerated share repurchases initial delivery percentage (as a percent)   85.00%          
Additional Award | Accelerated Share Repurchases, March 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased 600,000            
Completed Award | Accelerated Share Repurchases, March 2018              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased 5,100,000            
Average price paid per share (USD per share) $ 197.49