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Investments (Tables)
 12 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
Our investments consist of (in millions):
September 30,
20252024
Equity securities (other)105 106 
Other77 63
Long-term investments$182 $169 
Gain (Loss) on Securities
We record gains and losses on investments within the Change in fair value of investments line in the Consolidated Statement of Operations. The gains and losses on investments we recorded for the following periods were (in millions):
 202520242023
Net gain on equity securities (level 1)$— $— $281 
Net loss on equity securities (other)(3)(1)(1)
Equity method gain (loss) on Other investments— 1 (1)
Change in fair value of investments(3)— 279 
Total net realized gain on equity securities— — 281 
Total net unrealized loss on equity securities$(3)$(1)$(1)