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FAIR VALUE, Investments in Private Equity Measured at Net Asset Value Per Share (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Private equity investments measured at NAV, recorded value $ 112 $ 105
Private equity investments not measured at NAV, recorded value 7 7
Total private equity investments 119 112
Parent    
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]    
Private equity investments measured at NAV, unfunded commitment $ 34 $ 38