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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Sep. 30, 2019	May 01, 2019	Mar. 31, 2019	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Repurchases and retirements of ordinary shares		$ 4,122,000,000	$ 1,467,000,000	$ 5,122,000,000
Repurchases and retirements of ordinary shares		$ 87,000,000		$ 1,087,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 3,100,000,000		3,100,000,000
Adoption of ASU	$ 18,873,000,000		$ 18,873,000,000			$ 20,829,000,000
Share tender offer to purchase up to $4.0 billion of ordinary shares							$ 4,000,000,000.0
Share tender offer, price per share		$ 39.25
Share Tender Offer, Accepted Shares		102,000
Ordinary shares, par value	$ 0.01	$ 0.01	$ 0.01	$ 0.01		$ 0.01
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue		$ 4,035
Parent
Equity, Class of Treasury Stock [Line Items]
Repurchases and retirements of ordinary shares	$ 0		$ 1,467,000,000
Repurchases and retirements of ordinary shares		4,122,000,000		$ 5,122,000,000
Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchases and retirements of ordinary shares	0		1,467,000,000
Repurchases and retirements of ordinary shares		4,122,000,000		5,122,000,000
Adoption of ASU	$ 18,873,000,000	$ 21,409,000,000	$ 18,873,000,000	$ 21,409,000,000	$ 19,088,000,000	$ 20,829,000,000		$ 21,301,000,000	$ 22,458,000,000
Adoption of ASC 606 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Equity, Class of Treasury Stock [Line Items]
Adoption of ASU						0			(45,000,000)
Adoption of ASU 2016-16 | Total Equity Excluding Redeemable Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Equity, Class of Treasury Stock [Line Items]
Adoption of ASU						$ 0			$ (546,000,000)
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Share tender offer, price per share		$ 36.00
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Share tender offer, price per share		$ 40.00

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