Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Repurchases and retirements of ordinary shares	$ 392	$ 340		$ 1,427	$ 1,001
Stock Repurchase Program, Increase in Authorized Amount			$ 4,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 3,600			$ 3,600		$ 2,000