SHAREHOLDERS' EQUITY, Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period			$ 9,432
OCI:
OCI before reclassifications and taxes	$ (62)	$ (226)	192	$ (703)
Amounts reclassified from AOCI, before tax	(9)	2	(22)	10
Pre-tax net OCI	(71)	(224)	170	(693)
Income tax effect	27	37	(30)	158
Total other comprehensive income/(loss), net of tax	(44)	(187)	140	(535)
Balance end of period	9,922	9,492	9,922	9,492
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(798)	(389)	(982)	(41)
OCI:
Balance end of period	(842)	(576)	(842)	(576)
Subtotal: net investment hedges and currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(70)	(20)	(123)	(9)
OCI:
OCI before reclassifications and taxes	14	(32)	62	(47)
Amounts reclassified from AOCI, before tax	0	0	0	0
Pre-tax net OCI	14	(32)	62	(47)
Income tax effect	6	(8)	11	(4)
Total other comprehensive income/(loss), net of tax	20	(40)	73	(51)
Balance end of period	(50)	(60)	(50)	(60)
Net investment hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	136	71	153	81
OCI:
OCI before reclassifications and taxes	(22)	32	(45)	18
Amounts reclassified from AOCI, before tax	0	0	0	0
Pre-tax net OCI	(22)	32	(45)	18
Income tax effect	6	(8)	12	(4)
Total other comprehensive income/(loss), net of tax	(16)	24	(33)	14
Balance end of period	120	95	120	95
Currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(206)	(91)	(276)	(90)
OCI:
OCI before reclassifications and taxes	36	(64)	107	(65)
Amounts reclassified from AOCI, before tax	0	0	0	0
Pre-tax net OCI	36	(64)	107	(65)
Income tax effect	0	0	(1)	0
Total other comprehensive income/(loss), net of tax	36	(64)	106	(65)
Balance end of period	(170)	(155)	(170)	(155)
Available- for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(758)	(380)	(902)	(5)
OCI:
OCI before reclassifications and taxes	(102)	(206)	109	(711)
Amounts reclassified from AOCI, before tax	0	0	0	0
Pre-tax net OCI	(102)	(206)	109	(711)
Income tax effect	26	49	(41)	179
Total other comprehensive income/(loss), net of tax	(76)	(157)	68	(532)
Balance end of period	(834)	(537)	(834)	(537)
Cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	30	11	43	(27)
OCI:
OCI before reclassifications and taxes	26	12	21	55
Amounts reclassified from AOCI, before tax	(9)	2	(22)	10
Pre-tax net OCI	17	14	(1)	65
Income tax effect	(5)	(4)	0	(17)
Total other comprehensive income/(loss), net of tax	12	10	(1)	48
Balance end of period	$ 42	$ 21	$ 42	$ 21