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Product Warranty Obligations
 12 Months Ended
Sep. 30, 2025
Product Warranties Disclosures [Abstract]  
Product Warranty Obligations Product Warranty Obligations
We record a liability for product warranty obligations at the time of sale to a customer based upon historical warranty experience. Most of our products are covered under a warranty period that runs for twelve months from either the date of sale or installation. We also record a liability for specific warranty matters when they become known and reasonably estimable.
Changes in product warranty obligations were (in millions):
 September 30,
 20252024
Beginning balance$24 $18 
Warranties recorded at time of sale20 17 
Adjustments to pre-existing warranties(2)10 
Settlements of warranty claims(19)(21)
Ending balance$23 $24