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Fair Value Measurements and Investments (Tables)
 9 Months Ended
Jun. 30, 2023
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 1Level 2
 June 30,
2023		September 30,
2022		June 30,
2023		September 30,
2022
 (in millions)
Assets
Cash equivalents and restricted cash equivalents:
Money market funds
$12,605 $11,736 $— $— 
U.S. Treasury securities
175 799 — — 
Investment securities:
Marketable equity securities
347 437 — — 
U.S. government-sponsored debt securities
— — 1,153 457 
U.S. Treasury securities
3,788 4,005 — — 
Other current and non-current assets:
Money market funds
23 22 — — 
Derivative instruments
— — 197 1,131 
Total $16,938 $16,999 $1,350 $1,588 
Liabilities
Accrued compensation and benefits:
Deferred compensation liability
$181 $146 $— $— 
Accrued and other liabilities:
Derivative instruments
— — 482 418 
Total $181 $146 $482 $418 
Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Value of Debt Securities
The amortized cost, unrealized gains and losses and fair value of debt securities were as follows:
June 30, 2023
Amortized
Cost		Gross UnrealizedFair
Value
GainsLosses
(in millions)
U.S. government-sponsored debt securities$1,155 $— $(2)$1,153 
U.S. Treasury securities4,062 — (99)3,963 
Total$5,217 $— $(101)$5,116 
September 30, 2022
Amortized
Cost		Gross UnrealizedFair
Value
GainsLosses
(in millions)
U.S. government-sponsored debt securities$458 $— $(1)$457 
U.S. Treasury securities4,937 — (133)4,804 
Total$5,395 $— $(134)$5,261 
Debt securities with unrealized losses for less than 12 months and 12 months or greater were as follows:
June 30, 2023
Less Than 12 Months
12 Months or Greater
Fair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
(in millions)
U.S. government-sponsored debt securities$584 $(2)$— $— 
U.S. Treasury securities1,524 (17)2,165 (82)
Total$2,108 $(19)$2,165 $(82)
September 30, 2022
Less Than 12 Months
Fair ValueGross Unrealized Losses
(in millions)
U.S. government-sponsored debt securities$408 $(1)
U.S. Treasury securities3,507 (133)
Total$3,915 $(134)
Debt Securities Classified by Contractual Maturity Date
The stated maturities of debt securities were as follows:
June 30,
2023
 (in millions)
Due within one year$2,994 
Due after 1 year through 5 years2,122 
Total$5,116 
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, 2023 including cumulative unrealized gains and losses:
June 30,
2023
(in millions)
Initial cost basis$764 
Adjustments:
Upward adjustments899 
Downward adjustments (including impairment)(431)
Carrying amount, end of period$1,232 
Unrealized gains and losses included in the carrying value of the Company’s non-marketable equity securities still held as of June 30, 2023 and 2022 were as follows:
Three Months Ended
June 30,		Nine Months Ended
June 30,
2023202220232022
(in millions)
Upward adjustments$75 $5 $94 $231 
Downward adjustments (including impairment)$— $(284)$(86)$(337)