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COMMITMENTS, CONTINGENCIES AND GUARANTEES, Commitments Narrative (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2022
USD ($)
agreement
Underwriting commitment  
Commitments [Line Items]  
Number of open underwriting commitments | agreement 2
Various Investment Commitment  
Commitments [Line Items]  
Amount of commitment $ 51
Commitment to lend to RJTCF  
Commitments [Line Items]  
Amount of commitment $ 53
Number of days that investments in project partnerships are typically sold (in days) 90 days