Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 362	$ 385
Accumulated Amortization	(226)	(216)
Net Carrying Amount	136	169
Core deposit intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount	209	229
Accumulated Amortization	(179)	(182)
Net Carrying Amount	30	47
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	106	106
Accumulated Amortization	(29)	(17)
Net Carrying Amount	77	89
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	30	30
Accumulated Amortization	(9)	(7)
Net Carrying Amount	21	23
Other
Finite-Lived Intangible Assets
Gross Carrying Amount	17	20
Accumulated Amortization	(9)	(10)
Net Carrying Amount	$ 8	$ 10