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Equity - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 27, 2020
Oct. 01, 2019
Jul. 31, 2019
Aug. 31, 2020
Feb. 29, 2020
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total cash utilized             $ 1,164   $ 1,164 $ 1,144
Total cash utilized           $ 11   $ 500 $ 1,164 $ 1,144
2020 Repurchase Program                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)           0.0     0.5  
Average price paid per share (USD per share)           $ 351.77     $ 295.40  
Total cash utilized                 $ 1,161  
Total cash utilized           $ 11     $ 161  
2013 Repurchase Program                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)               0.0   0.8
Average price paid per share (USD per share)               $ 0   $ 184.51
Total cash utilized               $ 0   $ 144
Accelerated Share Repurchases, February 2020                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Average price paid per share (USD per share)                 $ 292.13  
Accelerated Share Repurchases, February 2020 | Initial Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 1.3  
Accelerated Share Repurchases, February 2020 | Additional Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares) 0.2       0.2       0.4  
Accelerated Share Repurchases, February 2020 | Completed Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 1.7  
Total cash utilized                 $ 500  
Accelerated Share Repurchases, February 2020 #2                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Average price paid per share (USD per share)                 $ 292.13  
Accelerated share repurchases initial delivery percentage (as a percent)                 85.00%  
Accelerated Share Repurchases, February 2020 #2 | Initial Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 1.4  
Accelerated Share Repurchases, February 2020 #2 | Additional Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares) 0.3               0.3  
Accelerated Share Repurchases, February 2020 #2 | Completed Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 1.7  
Total cash utilized                 $ 500  
Accelerated Share Repurchases, August 2019                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Average price paid per share (USD per share)                 $ 253.36  
Accelerated Share Repurchases, August 2019 | Initial Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 1.7  
Accelerated Share Repurchases, August 2019 | Additional Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)   0.1   0.2         0.3  
Accelerated Share Repurchases, August 2019 | Completed Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 2.0  
Total cash utilized                 $ 500  
Accelerated Share Repurchases, February 2019                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Average price paid per share (USD per share)                 $ 214.65  
Accelerated share repurchases initial delivery percentage (as a percent)                 85.00%  
Accelerated Share Repurchases, February 2019 | Initial Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 2.2  
Accelerated Share Repurchases, February 2019 | Additional Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)     0.1           0.1  
Accelerated Share Repurchases, February 2019 | Completed Award                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total number of shares purchased (shares)                 2.3  
Total cash utilized                 $ 500