BANK LOANS, NET, Allowance for Loan Losses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024	Mar. 31, 2025
Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 452	$ 471	$ 457	$ 474	$ 474
Provision/(benefit) for credit losses	15	(10)	31	23
Net (charge-offs)/recoveries:
Charge-offs	(4)	(7)	(25)	(45)
Recoveries	1	1	3	3
Net (charge-offs)/recoveries	(3)	(6)	(22)	(42)
Foreign exchange translation adjustment	1	1	(1)	1
Balance at end of period	$ 465	$ 456	$ 465	$ 456	457
ACL by loan portfolio segment as a % of total ACL	100.00%	100.00%	100.00%	100.00%
Increase in allowance for credit losses	$ 13		$ 8
Unfunded lending commitments
Net (charge-offs)/recoveries:
Unfunded lending commitments	24		24		22	$ 20
SBL
Net (charge-offs)/recoveries:
Charge-offs			0		0
SBL \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	7	$ 6	6	$ 7	7
Provision/(benefit) for credit losses	(1)	(1)	0	(2)
Net (charge-offs)/recoveries:
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net (charge-offs)/recoveries	0	0	0	0
Foreign exchange translation adjustment	0	0	0	0
Balance at end of period	$ 6	$ 5	$ 6	$ 5	6
ACL by loan portfolio segment as a % of total ACL	1.30%	1.10%	1.30%	1.10%
C&I loans
Net (charge-offs)/recoveries:
Charge-offs			$ (17)		(45)
C&I loans \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 171	$ 196	173	$ 214	214
Provision/(benefit) for credit losses	12	(20)	23	(9)
Net (charge-offs)/recoveries:
Charge-offs	(4)	(6)	(17)	(37)
Recoveries	1	0	2	2
Net (charge-offs)/recoveries	(3)	(6)	(15)	(35)
Foreign exchange translation adjustment	1	0	0	0
Balance at end of period	$ 181	$ 170	$ 181	$ 170	173
ACL by loan portfolio segment as a % of total ACL	39.00%	37.30%	39.00%	37.30%
CRE loans
Net (charge-offs)/recoveries:
Charge-offs			$ (8)		(21)
CRE loans \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 181	$ 181	188	$ 161	161
Provision/(benefit) for credit losses	(1)	16	0	43
Net (charge-offs)/recoveries:
Charge-offs	0	(1)	(8)	(8)
Recoveries	0	0	1	0
Net (charge-offs)/recoveries	0	(1)	(7)	(8)
Foreign exchange translation adjustment	0	1	(1)	1
Balance at end of period	$ 180	$ 197	$ 180	$ 197	188
ACL by loan portfolio segment as a % of total ACL	38.70%	43.20%	38.70%	43.20%
REIT loans
Net (charge-offs)/recoveries:
Charge-offs			$ 0		0
REIT loans \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 32	$ 19	23	$ 16	16
Provision/(benefit) for credit losses	4	1	13	4
Net (charge-offs)/recoveries:
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net (charge-offs)/recoveries	0	0	0	0
Foreign exchange translation adjustment	0	0	0	0
Balance at end of period	$ 36	$ 20	$ 36	$ 20	23
ACL by loan portfolio segment as a % of total ACL	7.70%	4.40%	7.70%	4.40%
Residential mortgage loans
Net (charge-offs)/recoveries:
Charge-offs			$ 0		0
Residential mortgage loans \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 60	$ 67	65	$ 74	74
Provision/(benefit) for credit losses	1	(6)	(4)	(13)
Net (charge-offs)/recoveries:
Charge-offs	0	0	0	0
Recoveries	0	1	0	1
Net (charge-offs)/recoveries	0	1	0	1
Foreign exchange translation adjustment	0	0	0	0
Balance at end of period	$ 61	$ 62	$ 61	$ 62	65
ACL by loan portfolio segment as a % of total ACL	13.10%	13.60%	13.10%	13.60%
Tax-exempt loans
Net (charge-offs)/recoveries:
Charge-offs			$ 0		0
Tax-exempt loans \| Loans held for investment
Changes in the allowance for loan losses [Roll Forward]
Balance at beginning of period	$ 1	$ 2	2	$ 2	2
Provision/(benefit) for credit losses	0	0	(1)	0
Net (charge-offs)/recoveries:
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net (charge-offs)/recoveries	0	0	0	0
Foreign exchange translation adjustment	0	0	0	0
Balance at end of period	$ 1	$ 2	$ 1	$ 2	$ 2
ACL by loan portfolio segment as a % of total ACL	0.20%	0.40%	0.20%	0.40%

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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