Fixed Assets - Composition of Partnership Equipment, Property and Improvements (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 3,215	$ 2,718
Less: accumulated depreciation	1,476	1,369
Less: accumulated software amortization	342	256
Fixed assets, net	1,397	1,093
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	1,303	1,229
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	823	738
Software [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	1,041	704
Land [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 48	$ 47