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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, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 816			$ 1,467
Repurchases and retirements of ordinary shares		$ 533			$ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	3,100			3,100
Parent
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 816			1,467
Repurchases and retirements of ordinary shares		$ 533			1,000
Accounting Standards Update 2014-09 [Member]
Equity, Class of Treasury Stock [Line Items]
Accounting Pronouncement					45
Accounting Standards Update 2014-09 [Member] | Parent
Equity, Class of Treasury Stock [Line Items]
Accounting Pronouncement			$ 45	0	45
Accounting Standards Update 2016-16 [Member]
Equity, Class of Treasury Stock [Line Items]
Accounting Pronouncement					546
Accounting Standards Update 2016-16 [Member] | Parent
Equity, Class of Treasury Stock [Line Items]
Accounting Pronouncement			$ 546	$ 0	$ 546

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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