INCOME TAXES, Income Tax Allocation (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Recorded in:
Net income	$ 234	$ 341	$ 454
Equity, arising from available-for-sale securities recorded through OCI	23	27	(19)
Equity, arising from currency translations, net of the impact of net investment hedges recorded through OCI	2	7	10
Equity, arising from cash flow hedges recorded through OCI	(12)	(23)	15
Total provision for income taxes	$ 247	$ 352	460
Change in tax expense due to remeasurement as result of Tax Cuts and Jobs Act			$ 105

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) for continuing operations, discontinued operations, other comprehensive income, and items charged (credited) directly to shareholders' equity.

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Amount, after adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act.

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