Business Combinations, Goodwill and Acquired Intangible - Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost Basis	$ 377	$ 377
Intangible assets subject to amortization, Accumulated Impairment and Amortization	(352)	(342)
Intangible assets subject to amortization, Net	25	35
Customer, Services and Lending Relationships [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost Basis	218	218
Intangible assets subject to amortization, Accumulated Impairment and Amortization	(212)	(207)
Intangible assets subject to amortization, Net	6	11
Software and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost Basis	119	119
Intangible assets subject to amortization, Accumulated Impairment and Amortization	(110)	(108)
Intangible assets subject to amortization, Net	9	11
Trade Names and Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, Cost Basis	40	40
Intangible assets subject to amortization, Accumulated Impairment and Amortization	(30)	(27)
Intangible assets subject to amortization, Net	$ 10	$ 13