SEGMENT INFORMATION, Classified by Major Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Revenues:
Total net revenues	$ 2,907	$ 2,718	$ 8,566	$ 8,172
Pre-tax income
Total pre-tax income	486	415	1,695	1,406
Total assets:
Total assets	77,633		77,633		$ 80,951
Goodwill:
Goodwill	1,443		1,443		1,422
U.S.
Revenues:
Total net revenues	2,652	2,472	7,819	7,491
Pre-tax income
Total pre-tax income	492	393	1,625	1,330
Total assets:
Total assets	71,653		71,653		74,428
Goodwill:
Goodwill	1,250		1,250		1,250
Canada
Revenues:
Total net revenues	140	138	418	404
Pre-tax income
Total pre-tax income	17	20	84	52
Total assets:
Total assets	3,397		3,397		3,631
Goodwill:
Goodwill	24		24		23
Europe
Revenues:
Total net revenues	115	108	329	277
Pre-tax income
Total pre-tax income	(23)	$ 2	(14)	$ 24
Total assets:
Total assets	2,583		2,583		2,892
Goodwill:
Goodwill	$ 169		$ 169		$ 149