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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Jul. 25, 2022
Jun. 30, 2022
Feb. 03, 2021
Common Stock Repurchase [Line Items]                  
Accelerated Share Repurchases, Settlement (Payment) or Receipt   $ 400             $ 500
Treasury Stock Acquired, Average Cost Per Share   $ 194.91 $ 199.90 $ 142.62 $ 191.47 $ 199.90      
Accelerated Share Repurchases, Cash or Stock Settlement 449,049 2.1 million 2.5 million            
Adjustments To Additional Paid In Capital, Equity Forward Contract $ 100                
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 922          
October Twenty Six Two Thousand Ten Program [Member]                  
Common Stock Repurchase [Line Items]                  
Stock Repurchase Program, Authorized Amount             $ 1,000 $ 5,400