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Restructuring and Related Activities (Tables)
 12 Months Ended
Sep. 30, 2025
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs The table below summarizes the activity related to severance costs:
Severance Cost Liability Activity
(in millions)
Severance cost liability at September 30, 2024$— 
Liabilities incurred during the period40 
Actual costs paid during the period(29)
Severance cost liability at September 30, 2025
$11