Regulatory Capital - Narrative (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	5.06%	6.35%
FCB
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	4.99%	5.85%
Dividend restrictions, additional maximum amount of distribution	$ 2.7
Payments of dividends	$ 1.4