Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions		Sep. 30, 2019	Sep. 30, 2018
Reconciliation of cash, cash equivalents and amounts reported within the balance sheet
Cash and cash equivalents	[1]	$ 20,252	$ 21,830
Restricted cash and cash equivalents amounts included in cash and investments segregated and on deposit for regulatory purposes	[1]	12,032	5,264
Total cash and cash equivalents, including amounts restricted shown in the statement of cash flows	[1]	$ 32,284	$ 27,094

[1] For more information on the nature of restrictions on restricted cash and cash equivalents, see Note 15.