Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 361	$ 385
Accumulated Amortization	(236)	(216)
Net Carrying Amount	125	169
Core deposit intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount	209	229
Accumulated Amortization	(184)	(182)
Net Carrying Amount	25	47
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	106	106
Accumulated Amortization	(33)	(17)
Net Carrying Amount	73	89
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	30	30
Accumulated Amortization	(10)	(7)
Net Carrying Amount	20	23
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	16	20
Accumulated Amortization	(9)	(10)
Net Carrying Amount	$ 7	$ 10