Consolidated Statements of Financial Condition - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
ASSETS:
Cash and cash equivalents	$ 846	$ 1,047
Cash and investments segregated under federal regulations	10,099	12,680
Securities purchased under agreements to resell	1,164	892
Receivable from:
Clients	3,300	3,129
Mutual funds, insurance companies and other	540	513
Brokers, dealers and clearing organizations	247	219
Securities owned, at fair value:
Investment securities	258	224
Inventory securities	50	43
Equipment, property and improvements, at cost, net of accumulated depreciation and amortization	544	549
Other assets	128	128
TOTAL ASSETS	17,176	19,424
Payable to:
Clients	12,810	15,414
Brokers, dealers and clearing organizations	67	99
Accrued compensation and employee benefits	1,339	1,116
Accounts payable, accrued expenses and other	165	161
Total liabilities before partnership capital	14,381	16,790
Commitments and contingencies (Notes 11 and 12)
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans	2,505	2,417
Reserve for anticipated withdrawals	290	217
Total partnership capital subject to mandatory redemption	2,795	2,634
TOTAL LIABILITIES	17,176	19,424
Limited Partnership Capital [Member]
Payable to:
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans	890	902
Subordinated Limited Partnership Capital [Member]
Payable to:
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans	463	421
General Partnership Capital [Member]
Payable to:
Partnership capital subject to mandatory redemption, net of reserve for anticipated withdrawals and partnership loans	$ 1,152	$ 1,094