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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)