SHAREHOLDERS' EQUITY, Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	$ 8,303	$ 7,176
OCI:
OCI before reclassifications and taxes	(1,214)	(96)	$ 45
Amounts reclassified from AOCI, before tax	9	10	2
Pre-tax net OCI	(1,205)	(86)	47
Income tax effect	264	34	(13)
Total other comprehensive income/(loss), net of tax	(941)	(52)	34
Balance, end of year	9,432	8,303	7,176
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(41)	11	(23)
OCI:
Balance, end of year	(982)	(41)	11
Subtotal: net investment hedges and currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(9)	(25)	(25)
OCI:
OCI before reclassifications and taxes	(91)	4	2
Amounts reclassified from AOCI, before tax	0	2	0
Pre-tax net OCI	(91)	6	2
Income tax effect	(23)	10	(2)
Total other comprehensive income/(loss), net of tax	(114)	16	0
Balance, end of year	(123)	(9)	(25)
Net investment hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	81	115	110
OCI:
OCI before reclassifications and taxes	95	(44)	7
Amounts reclassified from AOCI, before tax	0	0	0
Pre-tax net OCI	95	(44)	7
Income tax effect	(23)	10	(2)
Total other comprehensive income/(loss), net of tax	72	(34)	5
Balance, end of year	153	81	115
Currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(90)	(140)	(135)
OCI:
OCI before reclassifications and taxes	(186)	48	(5)
Amounts reclassified from AOCI, before tax	0	2	0
Pre-tax net OCI	(186)	50	(5)
Income tax effect	0	0	0
Total other comprehensive income/(loss), net of tax	(186)	50	(5)
Balance, end of year	(276)	(90)	(140)
Available- for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(5)	89	21
OCI:
OCI before reclassifications and taxes	(1,208)	(119)	94
Amounts reclassified from AOCI, before tax	0	(7)	(3)
Pre-tax net OCI	(1,208)	(126)	91
Income tax effect	311	32	(23)
Total other comprehensive income/(loss), net of tax	(897)	(94)	68
Balance, end of year	(902)	(5)	89
Cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(27)	(53)	(19)
OCI:
OCI before reclassifications and taxes	85	19	(51)
Amounts reclassified from AOCI, before tax	9	15	5
Pre-tax net OCI	94	34	(46)
Income tax effect	(24)	(8)	12
Total other comprehensive income/(loss), net of tax	70	26	(34)
Balance, end of year	$ 43	$ (27)	$ (53)