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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Fair Value [Line Items]
Fair value of long term debt	$ 6,800		$ 6,800		$ 8,500
Fair Value, Inputs, Level 1 [Member]
Fair Value [Line Items]
Fair value of long term debt	6,600		6,600		8,300
Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Fair value of long term debt	200		200		$ 200
Deferred compensation plan assets [Member]
Fair Value [Line Items]
Unrealized gains (losses)	(7)	$ 0	(7)	$ 7
Exchange Traded Funds
Fair Value [Line Items]
Unrealized gains (losses)	$ (61)	$ 16	$ (67)	$ 39

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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