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Equity - Narrative (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Oct. 01, 2019
Aug. 05, 2019
Jul. 31, 2019
Feb. 11, 2019
Jan. 02, 2019
Oct. 29, 2018
Sep. 25, 2018
Mar. 06, 2018
Aug. 31, 2019
Jan. 02, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)                     2,000,000.0 700,000 5,400,000 5,700,000  
Average price paid per share (USD per share)                     $ 0 $ 205.11 $ 184.51 $ 180.94  
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)                     5,200,000   5,200,000    
Accelerated Share Repurchases, August 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Authorized stock repurchase program amount   $ 500,000,000                          
Payments for accelerated share repurchases   $ 500,000,000                          
Accelerated Share Repurchases, August 2019 | Subsequent Event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Authorized stock repurchase program amount $ 500,000,000                            
Accelerated Share Repurchases, February 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Authorized stock repurchase program amount     $ 500,000,000 $ 500,000,000                      
Payments for accelerated share repurchases       $ 500,000,000                      
Accelerated Share Repurchases, October 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Authorized stock repurchase program amount           $ 500,000,000                  
Payments for accelerated share repurchases           $ 500,000,000                  
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, August 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)   1,600,000                          
Initial Award | Accelerated Share Repurchases, February 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)       2,200,000                      
Accelerated share repurchases initial delivery percentage (as a percent)       85.00%                      
Initial Award | Accelerated Share Repurchases, October 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)           2,500,000                  
Accelerated share repurchases initial delivery percentage (as a percent)           85.00%                  
Initial Award | Accelerated Share Repurchases, March 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)               4,500,000              
Accelerated share repurchases initial delivery percentage (as a percent)               85.00%              
Additional Award | Accelerated Share Repurchases, August 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)                 200,000            
Additional Award | Accelerated Share Repurchases, August 2019 | Subsequent Event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares) 100,000                            
Additional Award | Accelerated Share Repurchases, February 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)     100,000                        
Additional Award | Accelerated Share Repurchases, October 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)         400,000                    
Additional Award | Accelerated Share Repurchases, March 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)             600,000                
Completed Award | Accelerated Share Repurchases, August 2019 | Subsequent Event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares) 2,000,000.0                            
Average price paid per share (USD per share) $ 253.36                            
Completed Award | Accelerated Share Repurchases, February 2019                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)     2,300,000                        
Average price paid per share (USD per share)     $ 214.65                        
Completed Award | Accelerated Share Repurchases, October 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)                   2,900,000          
Average price paid per share (USD per share)                   $ 173.80          
Completed Award | Accelerated Share Repurchases, March 2018                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total number of shares purchased (shares)             5,100,000                
Average price paid per share (USD per share)             $ 197.49                
License Agreement | 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%