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Segment Information - Tangible long-lived assets, including property, plant and equipment and operating lease right-of-use assets, by geographic region (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Long-Lived Assets    
Tangible long lived assets, including property, plant and equipment and operating lease right-of-use assets $ 3,631 $ 3,711
U.S.    
Long-Lived Assets    
Tangible long lived assets, including property, plant and equipment and operating lease right-of-use assets 760 927
Non-U.S.    
Long-Lived Assets    
Tangible long lived assets, including property, plant and equipment and operating lease right-of-use assets $ 2,871 $ 2,784