Equipment, Property and Improvements - Composition of Partnership's Equipment, Property and Improvements (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	$ 1,546	$ 1,522
Accumulated depreciation and amortization	(997)	(963)
Equipment, property and improvements, net	549	559
Land [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	25	25
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	911	886
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	$ 610	$ 611