Fixed Assets - Composition of Partnership Equipment, Property and Improvements (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 2,718	$ 2,338
Less: accumulated depreciation	1,369	1,295
Less: accumulated software amortization	256	181
Fixed assets, net	1,093	862
Buildings and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	1,229	1,178
Equipment, Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	738	670
Software [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	704	442
Land [Member]
Property, Plant and Equipment [Line Items]
Fixed assets, at cost	$ 47	$ 48