Intangible Assets - Schedule Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 726	$ 756
Accumulated Amortization	(238)	(131)
Net Carrying Value	488	625
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	700	700
Accumulated Amortization	(229)	(113)
Net Carrying Value	471	587
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26	56
Accumulated Amortization	(9)	(18)
Net Carrying Value	$ 17	$ 38