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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities, Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Fair Value of Assets    
Gross amount recognized $ 56 $ 54
Gross amount eligible for offsetting (19) (42)
Net amount 37 12
Fair Value of Liabilities    
Gross amount recognized 3,280 3,138
Gross amount eligible for offsetting (19) (42)
Net amount $ 3,261 $ 3,096
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