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Derivatives and Foreign Currency Operations - Schedule of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Fair value of derivatives, liability	$ (17)		$ (110)
Cross-currency swaps
Derivatives, Fair Value [Line Items]
Fair value of derivatives, liability	(900)	$ (358)
Derivatives Designated as Effective Hedges | Cash flow hedges | Foreign exchange contract
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	12		1
Fair value of derivatives, liability	(2)		(19)
Derivatives Designated as Effective Hedges | Fair value hedges | Interest rate swap
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	3		7
Derivatives Designated as Effective Hedges | Net investment hedges | Cross-currency swaps
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	18		10
Fair value of derivatives, liability	(41)		(102)
Derivatives Not Designated as Effective Hedges | Foreign exchange contract
Derivatives, Fair Value [Line Items]
Fair value of derivatives, asset	7		10
Fair value of derivatives, liability	$ (14)		$ (17)

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