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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Repurchases and retirements of ordinary shares	$ 509	$ 315	$ 1,035	$ 661
Stock Repurchase Program, Increase in Authorized Amount		$ 4,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 4,000		$ 4,000		$ 2,000

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Stock Repurchase Program, Increase in Authorized Amount

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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