DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Gain (Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	$ (11)	$ 29	$ (13)	$ 38
Total gains/(losses) included in AOCI, net of taxes	(14)	20	(30)	28
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	(11)	29	(13)	38
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Net investment hedges	$ (3)	$ (9)	$ (17)	$ (10)

Other Comprehensive Income (Loss), Cash Flow Hedge And Net Investment Hedge, Gain (Loss), Before Reclassification, After Tax

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Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification And Tax

+ References

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580

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