Intangible Assets - Schedule Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 756	$ 292
Accumulated Amortization	(22)	(5)
Total	734	287
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	700	250
Accumulated Amortization	(17)	(4)
Total	683	246
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	56	42
Accumulated Amortization	(5)	(1)
Total	$ 51	$ 41