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Equity - Accelerated Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2020
Feb. 29, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Jul. 27, 2020
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total cash utilized     $ 0 $ 1,153      
Total Cash Utilized       $ 1,153      
Stock Repurchases              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)       0.5      
Average price paid per share (USD per share)       $ 291.99      
Total cash utilized       $ 1,150 $ 3   $ 1,153
Total Cash Utilized       $ 150      
Capped ASR, February 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Average price paid per share (USD per share)           $ 292.13  
Total cash utilized   $ 500          
Capped ASR, February 2020 | Initial Shares Delivered              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)   1.3          
Capped ASR, February 2020 | Additional Shares Delivered              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares) 0.2 0.2       0.4  
Capped ASR, February 2020 | Total Number of Shares Purchased              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)           1.7  
Uncapped ASR, February 2020              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Average price paid per share (USD per share)           $ 292.13  
Total cash utilized           $ 500  
Accelerated share repurchases initial delivery percentage (as a percent)           85.00%  
Uncapped ASR, February 2020 | Initial Shares Delivered              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)           1.4  
Uncapped ASR, February 2020 | Additional Shares Delivered              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)           0.3  
Uncapped ASR, February 2020 | Total Number of Shares Purchased              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total number of shares purchased (shares)           1.7