Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions		Sep. 30, 2018	Sep. 30, 2017	[2]
Reconciliation of cash, cash equivalents and amounts reported within the balance sheet
Cash and cash equivalents	[1]	$ 21,830	$ 12,253
Restricted cash and cash equivalents amounts included in cash and investments segregated and on deposit for regulatory purposes	[1]	5,264	7,668
Total cash and cash equivalents, including amounts restricted shown in the statement of cash flows	[1]	$ 27,094	$ 19,921

[1] Reconciliation of cash, cash equivalents and amounts reported within the balance sheet

[2] Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.