Fair Value Measurements and Investments (Tables)

9 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Measurements Using Inputs Considered as
	Level 1				Level 2
	June 30, 2021		September 30, 2020		June 30, 2021		September 30, 2020
	(in millions)
Assets
Cash equivalents and restricted cash equivalents:
Money market funds	$	14,830	$	12,522	$	—	$	—
U.S. government-sponsored debt securities	—		—		600		1,469
U.S. Treasury securities	750		650		—		—
Investment securities:
Marketable equity securities	550		148		—		—
U.S. government-sponsored debt securities	—		—		486		2,582
U.S. Treasury securities	1,271		1,253		—		—
Other current and non-current assets:
Money market funds	3		—		—		—
Derivative instruments	—		—		389		512
Total	$	17,404	$	14,573	$	1,475	$	4,563
Liabilities
Accrued compensation and benefits:
Deferred compensation liability	$	168	$	135	$	—	$	—
Accrued and other liabilities:
Derivative instruments	—		—		216		181
Total	$	168	$	135	$	216	$	181

Schedule of Non-Marketable Equity Securities

The following table summarizes the total carrying value of the Company’s non-marketable equity securities held as of June 30, 2021 including cumulative unrealized gains and losses:

	June 30, 2021
	(in millions)
Initial cost basis	$	857
Adjustments:
Upward adjustments	446
Downward adjustments (including impairment)	(13)
Carrying amount, end of period	$	1,290

During the three and nine months ended June 30, 2021 and 2020, unrealized gains and losses included in the carrying value of the Company’s non-marketable equity securities still held as of June 30, 2021 and 2020 were as follows:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2021		2020		2021		2020
	(in millions)
Upward adjustments	$	180	$	56	$	323	$	65
Downward adjustments (including impairment)	$	—	$	(6)	$	(2)	$	(6)