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Fair Value Measurements and Investments - Schedule of Continuous Unrealized Losses for Less than 12 Months and More than 12 Months (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 0 | $ 1,772
Less Than 12 Months, Gross Unrealized Losses | 0 | (14)
12 Months or Greater, Fair Value | 1,183 | 2,178
12 Months or Greater, Gross Unrealized Losses | (5) | (68)
U.S. government-sponsored debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 412
Less Than 12 Months, Gross Unrealized Losses | 0 | (2)
12 Months or Greater, Fair Value | 164 | 50
12 Months or Greater, Gross Unrealized Losses | 0 | 0
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 0 | 1,360
Less Than 12 Months, Gross Unrealized Losses | 0 | (12)
12 Months or Greater, Fair Value | 1,019 | 2,128
12 Months or Greater, Gross Unrealized Losses | $ (5) | $ (68)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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