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Leasing Arrangements - Schedule of Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Leases [Abstract]        
Operating cash flows from operating leases $ 6 $ 7 $ 13 $ 14
Investing cash flows from finance leases $ 0 $ 10 $ 0 $ 10