GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS, NET, Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Roll Forward]
Goodwill (beginning of the period)	$ 464	$ 478
Additions		7
Foreign currency translations	2	(2)
Impairment	0	(19)	$ 0
Goodwill (end of the period)	466	464	478
Private Client Group
Goodwill [Roll Forward]
Goodwill (beginning of the period)	275	276
Additions		0
Foreign currency translations	2	(1)
Impairment		0
Goodwill (end of the period)	277	275	276
Capital Markets
Goodwill [Roll Forward]
Goodwill (beginning of the period)	120	133
Additions		7
Foreign currency translations	0	(1)
Impairment		(19)
Goodwill (end of the period)	120	120	133
Asset Management
Goodwill [Roll Forward]
Goodwill (beginning of the period)	69	69
Additions		0
Foreign currency translations	0	0
Impairment		0
Goodwill (end of the period)	$ 69	$ 69	$ 69

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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