v3.26.1
Fair Value Measurements - Narrative (Details) - USD ($)
$ in Billions
Jun. 30, 2026
Sep. 30, 2025
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of long-term debt $ 2.4 $ 2.5