Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	[1]
Reconciliation of cash, cash equivalents and amounts reported within the balance sheet
Cash and cash equivalents	$ 14,145	$ 9,475
Restricted cash and cash equivalents amounts included in Cash and investments segregated and on deposit for regulatory purposes	3,480	5,802
Total cash and cash equivalents, including amounts restricted shown in the statement of cash flows	$ 17,625	$ 15,277

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