SHAREHOLDERS' EQUITY, Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period			$ 8,303
OCI:
OCI before reclassifications and taxes	$ (226)	$ 31	(703)	$ (58)
Amounts reclassified from AOCI, before tax	2	1	10	6
Pre-tax net OCI	(224)	32	(693)	(52)
Income tax effect	37	(4)	158	31
Total other comprehensive income/(loss), net of tax	(187)	28	(535)	(21)
Balance end of period	9,492	7,918	9,492	7,918
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(389)	(38)	(41)	11
OCI:
Total other comprehensive income/(loss), net of tax	(187)	28	(535)	(21)
Balance end of period	(576)	(10)	(576)	(10)
Subtotal: net investment hedges and currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(20)	(5)	(9)	(25)
OCI:
OCI before reclassifications and taxes	(32)	2	(47)	8
Amounts reclassified from AOCI, before tax	0	0	0	2
Pre-tax net OCI	(32)	2	(47)	10
Income tax effect	(8)	3	(4)	15
Total other comprehensive income/(loss), net of tax	(40)	5	(51)	25
Balance end of period	(60)	0	(60)	0
Net investment hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	71	76	81	115
OCI:
OCI before reclassifications and taxes	32	(12)	18	(63)
Amounts reclassified from AOCI, before tax	0	0	0	0
Pre-tax net OCI	32	(12)	18	(63)
Income tax effect	(8)	3	(4)	15
Total other comprehensive income/(loss), net of tax	24	(9)	14	(48)
Balance end of period	95	67	95	67
Currency translations
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(91)	(81)	(90)	(140)
OCI:
OCI before reclassifications and taxes	(64)	14	(65)	71
Amounts reclassified from AOCI, before tax	0	0	0	2
Pre-tax net OCI	(64)	14	(65)	73
Income tax effect	0	0	0	0
Total other comprehensive income/(loss), net of tax	(64)	14	(65)	73
Balance end of period	(155)	(67)	(155)	(67)
Available- for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	(380)	(4)	(5)	89
OCI:
OCI before reclassifications and taxes	(206)	36	(711)	(84)
Amounts reclassified from AOCI, before tax	0	(2)	0	(7)
Pre-tax net OCI	(206)	34	(711)	(91)
Income tax effect	49	(9)	179	23
Total other comprehensive income/(loss), net of tax	(157)	25	(532)	(68)
Balance end of period	(537)	21	(537)	21
Cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance beginning of period	11	(29)	(27)	(53)
OCI:
OCI before reclassifications and taxes	12	(7)	55	18
Amounts reclassified from AOCI, before tax	2	3	10	11
Pre-tax net OCI	14	(4)	65	29
Income tax effect	(4)	2	(17)	(7)
Total other comprehensive income/(loss), net of tax	10	(2)	48	22
Balance end of period	$ 21	$ (31)	$ 21	$ (31)