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Leasing Arrangements - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Lessee Lease Description [Line Items]        
Right-of-use assets exchanged for new operating lease obligations $ 3 $ 1 $ 4 $ 2