DERIVATIVE ASSETS AND DERIVATIVE LIABILITIES, Derivative Gain (Loss) Recognized in AOCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	$ 29	$ 19	$ 38	$ 24
Total gains/(losses) in AOCI, net of taxes	20	9	28	(15)
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges	29	19	38	24
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Net investment hedges	$ (9)	$ (10)	$ (10)	$ (39)

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 http://asc.fasb.org/extlink&oid=124509347&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 http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580

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