Schedule I - Condensed Statements of Financial Condition (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS:
Cash and cash equivalents	$ 1,014	$ 1,498	$ 846
Investment securities	332	250
Other assets	156	142
TOTAL ASSETS	19,317	15,815	17,176
LIABILITIES:
Accounts payable, accrued expenses and other	351	288
Partnership capital subject to mandatory redemption	3,364	2,855	$ 2,795	$ 2,634
TOTAL LIABILITIES	19,317	15,815
Parent Company [Member]
ASSETS:
Cash and cash equivalents	320	318
Investment securities	2	7
Investment in subsidiaries	3,109	2,596
Other assets	49	33
TOTAL ASSETS	3,480	2,954
LIABILITIES:
Accounts payable, accrued expenses and other	116	99
Partnership capital subject to mandatory redemption	3,364	2,855
TOTAL LIABILITIES	$ 3,480	$ 2,954