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Fair Value Measurements and Investments (Tables)
 12 Months Ended
Sep. 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 as of September 30
Using Inputs Considered as
Level 1Level 2
2023202220232022
(in millions)
Assets
Cash equivalents and restricted cash equivalents:
Money market funds$13,504 $11,736 $— $— 
U.S. Treasury securities301 799 — — 
Investment securities:
Marketable equity securities339 437 — — 
U.S. government-sponsored debt securities— — 1,108 457 
U.S. Treasury securities4,316 4,005 — — 
Other current and non-current assets:
Money market funds23 22 — — 
Derivative instruments— — 293 1,131 
Total$18,483 $16,999 $1,401 $1,588 
Liabilities
Accrued compensation and benefits:
Deferred compensation liability$175 $146 $— $— 
Accrued and other liabilities:
Derivative instruments— — 396 418 
Total$175 $146 $396 $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:
September 30, 2023
Amortized
Cost		Gross UnrealizedFair
Value
GainsLosses
(in millions)
U.S. government-sponsored debt securities$1,109 $1 $(2)$1,108 
U.S. Treasury securities4,697 — (80)4,617 
Total$5,806 $1 $(82)$5,725 
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:
September 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$412 $(2)$50 $— 
U.S. Treasury securities1,360 (12)2,128 (68)
Total$1,772 $(14)$2,178 $(68)
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:
September 30,
2023
 (in millions)
Due within one year$3,804 
Due after one year through five years
1,921 
Total$5,725 
Schedule of Non-Marketable Equity Securities
The following table summarizes the total carrying value of the Company’s non-marketable equity securities that were accounted for using the fair value measurement alternative and held as of September 30, 2023, including cumulative unrealized gains and losses:
September 30,
2023
(in millions)
Initial cost basis$719 
Adjustments:
Upward adjustments899 
Downward adjustments (including impairment)(445)
Carrying amount
$1,173 
Unrealized gains and losses recognized during fiscal 2023 and 2022 that were included in the carrying value of the Company’s non-marketable equity securities accounted for using the fair value measurement alternative and still held as of September 30, 2023 and 2022, respectively, were as follows:
For the Years Ended
September 30,
20232022
(in millions)
Upward adjustments$94 $231 
Downward adjustments (including impairment)$(99)$(341)
Schedule of Investment Income
Investment income (expense) consisted of the following:
 For the Years Ended
September 30,
 202320222021
 (in millions)
Interest and dividend income on cash and investments$745 $69 $(16)
Equity securities:
Unrealized gains (losses), net(84)(364)721 
Realized gains (losses), net2 68 26 
Investment income (expense)$663 $(227)$731