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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities, Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Fair Value of Assets    
Gross amount recognized $ 15 $ 22
Gross amount eligible for offsetting (4) (12)
Net amount 11 10
Fair Value of Liabilities    
Gross amount recognized 3,631 3,450
Gross amount eligible for offsetting (4) (12)
Net amount $ 3,627 $ 3,438
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other current assets Other current assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities