Equipment, Property and Improvements - Composition of Partnership's Equipment, Property and Improvements (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	$ 1,522	$ 1,485
Accumulated depreciation and amortization	(963)	(936)
Equipment, property and improvements, net	559	549
Land [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	25	26
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	886	846
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Equipment, property and improvements, at cost	$ 611	$ 613