DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2021
Derivative [Line Items]
Gain (loss) excluded from assessment of hedge effectiveness		$ 0	$ 0	$ 0
Interest expense	$ 43,000,000	$ 75,000,000	$ 94,000,000	$ 148,000,000
RJ Bank
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge			8 years
Forecast | Reclassification out of accumulated other comprehensive income
Derivative [Line Items]
Interest expense					$ 12,000,000