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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]    
Repurchases and retirements of ordinary shares $ 346 $ 651
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 2,000