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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Feb. 01, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities due within one year		$ 3,400,000,000		$ 3,400,000,000
Debt securities due within one to five years		2,200,000,000		2,200,000,000
Unrealized gains (losses) on equity securities held as of the end of the period		(278,000,000)	$ 434,000,000	(262,000,000)	$ 610,000,000
Impairment of indefinite-lived intangible assets and goodwill	$ 0
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of debt		23,800,000,000		23,800,000,000		$ 21,000,000,000
Estimated Fair Value | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of debt		$ 22,500,000,000		$ 22,500,000,000		$ 22,500,000,000

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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