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Equity - Accelerated Share Repurchase Program (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Jul. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Cash Utilized $ 7,003 $ 0  
Uncapped ASR, March 2022      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average Price Paid Per Share (USD per share)     $ 390.58
Total Cash Utilized $ 7,000   $ 7,000
Accelerated share repurchases initial delivery percentage (as a percent)     85.00%
Uncapped ASR, March 2022 | Initial Shares Delivered      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Delivered and Purchased (shares)     15.2
Uncapped ASR, March 2022 | Additional Shares Delivered      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Delivered and Purchased (shares)     0.0
Uncapped ASR, March 2022 | Total Number of Shares Purchased      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Delivered and Purchased (shares)     15.2