Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 0	$ 0	$ 0
Adjustments to reconcile net income to net cash provided by operating activities:
Income before allocations to partners	990	872	746
Depreciation and amortization	94	85	82
Changes in assets and liabilities:
Investments segregated under federal regulations	1,406	1,747	(1,143)
Securities purchased under agreements to resell	253	(272)	(49)
Net payable to clients	(1,752)	(2,775)	2,846
Net receivable from brokers, dealers and clearing organizations	9	(60)	(31)
Receivable from mutual funds, insurance companies and other	(15)	(27)	(63)
Securities owned	15	(41)	(30)
Other assets	(14)
Accrued compensation and employee benefits	126	223	122
Accounts payable, accrued expenses and other	26	4	(20)
Net cash provided (used in) by operating activities	1,138	(244)	2,460
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of equipment, property and improvements	(105)	(80)	(73)
Cash used in investing activities	(105)	(80)	(73)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests	60	80	72
Redemption of partnership interests	(199)	(193)	(178)
Distributions from partnership capital	(694)	(598)	(616)
Net cash used in financing activities	(833)	(711)	(722)
Net increase (decrease) in cash, cash equivalents and restricted cash	200	(1,035)	1,665
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH:
Beginning of year	8,537	9,572	7,907
End of year	$ 8,737	$ 8,537	$ 9,572