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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 9 Months Ended
Jul. 27, 2020
Feb. 29, 2020
Sep. 30, 2020
Jul. 27, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total Cash Utilized         $ 0 $ 1,164
2020 Repurchase Program | 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    
2020 Repurchase Program | Capped ASR, February 2020 | Initial Shares Delivered            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)       1.3    
2020 Repurchase Program | Capped ASR, February 2020 | Additional Shares Delivered            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares) 0.2 0.2   0.4    
2020 Repurchase Program | Capped ASR, February 2020 | Total Number of Shares Purchased            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)       1.7    
2020 Repurchase Program | 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%    
2020 Repurchase Program | Uncapped ASR, February 2020 | Initial Shares Delivered            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)       1.4    
2020 Repurchase Program | Uncapped ASR, February 2020 | Additional Shares Delivered            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)       0.3    
2020 Repurchase Program | Uncapped ASR, February 2020 | Total Number of Shares Purchased            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)       1.7    
Open market purchases            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares Delivered and Purchased (shares)     0.0     0.5
Average Price Paid Per Share (USD per share)     $ 351.77     $ 295.40
Total Cash Utilized     $ 11     $ 161