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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]    
Stock Repurchased and Retired During Period, Value $ 651  
Repurchases and retirements of ordinary shares   $ 467
Stock Repurchase Program, Remaining Authorized Repurchase Amount 3,900  
Parent    
Equity, Class of Treasury Stock [Line Items]    
Stock Repurchased and Retired During Period, Value 651  
Repurchases and retirements of ordinary shares   467
Accounting Standards Update 2014-09 [Member]    
Equity, Class of Treasury Stock [Line Items]    
Cumulative Effect on Retained Earnings, Net of Tax   45
Accounting Standards Update 2014-09 [Member] | Parent    
Equity, Class of Treasury Stock [Line Items]    
Cumulative Effect on Retained Earnings, Net of Tax 0 45
Accounting Standards Update 2016-16 [Member]    
Equity, Class of Treasury Stock [Line Items]    
Cumulative Effect on Retained Earnings, Net of Tax   546
Accounting Standards Update 2016-16 [Member] | Parent    
Equity, Class of Treasury Stock [Line Items]    
Cumulative Effect on Retained Earnings, Net of Tax $ 0 $ 546