FAIR VALUE, Investments in Private Equity Measured at Net Asset Value Per Share (Details) - Other investments - private equity - Recurring - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments measured at NAV, recorded value	$ 90	$ 94
Private equity investments not measured at NAV, recorded value	5	75
Total private equity investments	95	169
Parent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private equity investments measured at NAV, unfunded commitment	$ 39	24
Total private equity investments		120
Noncontrolling Interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total private equity investments		$ 49