Offsetting Assets and Liabilities - Schedule of Partnership's Securities Purchased Under Agreement to Resell (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 29, 2024	Dec. 31, 2023
Offsetting Securities Purchased under Agreements to Resell [Abstract]
Securities purchased under agreements to resell, Gross amounts of recognized assets	$ 371		$ 1,139
Securities purchased under agreements to resell, Gross amounts offset in the Consolidated Statements of Financial Condition	0		0
Securities purchased under agreements to resell, Net amounts presented in the Consolidated Statements of Financial Condition	371	$ 371	1,139
Securities purchased under agreements to resell, Gross amounts not offset in the Consolidated Statements of Financial Condition, Financial instruments	0		0
Securities purchased under agreements to resell, Gross amounts not offset in the Consolidated Statements of Financial Condition, Securities collateral	(371)		(1,139)
Securities purchased under agreements to resell, Net amount	$ 0		$ 0