Offsetting Assets and Liabilities - Schedule of Partnership's Securities Purchased Under Agreement to Resell (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Offsetting Securities Purchased Under Agreements To Resell [Abstract]
Securities purchased under agreements to resell, Gross amounts of recognized assets	$ 843	$ 634
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	843	634
Securities purchased under agreements to resell, gross amounts not offset, financial instruments	0	0
Securities purchased under agreements to resell, gross amounts not offset, securities collateral	(843)	(634)
Securities purchased under agreements to resell, Net amount	$ 0	$ 0