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Regulatory Capital - Schedule of Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basel III Requirements, Total risk-based capital 0.1050  
Basel III Requirements, Tier 1 risk-based capital 0.0850  
Basel III Requirements, Common equity Tier 1 0.0700  
Basel III Requirements, Tier 1 leverage 0.0400  
PCA well-capitalized thresholds, Total risk-based capital 0.1000  
PCA well-capitalized thresholds, Tier 1 risk-based capital 0.0800  
PCA well-capitalized thresholds, Common equity Tier 1 0.0650  
PCA well-capitalized thresholds, Tier 1 leverage 0.0500  
Total risk-based capital, amount $ 23,891 $ 11,799
Tier 1 risk-based capital, amount 21,150 9,902
Common equity Tier 1, amount 20,270 9,021
Tier 1 leverage, amount $ 21,150 $ 9,902
Total risk-based capital, Ratio 0.1575 0.1318
Tier 1 risk-based capital, Ratio 0.1394 0.1106
Common equity Tier 1, Ratio 0.1336 0.1008
Tier 1 leverage, Ratio 0.0983 0.0899
FCB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Basel III Requirements, Total risk-based capital 0.1050  
Basel III Requirements, Tier 1 risk-based capital 0.0850  
Basel III Requirements, Common equity Tier 1 0.0700  
Basel III Requirements, Tier 1 leverage 0.0400  
PCA well-capitalized thresholds, Total risk-based capital 0.1000  
PCA well-capitalized thresholds, Tier 1 risk-based capital 0.0800  
PCA well-capitalized thresholds, Common equity Tier 1 0.0650  
PCA well-capitalized thresholds, Tier 1 leverage 0.0500  
Total risk-based capital, amount $ 23,600 $ 11,627
Tier 1 risk-based capital, amount 21,227 10,186
Common equity Tier 1, amount 21,227 10,186
Tier 1 leverage, amount $ 21,227 $ 10,186
Total risk-based capital, Ratio 0.1556 0.1299
Tier 1 risk-based capital, Ratio 0.1399 0.1138
Common equity Tier 1, Ratio 0.1399 0.1138
Tier 1 leverage, Ratio 0.0988 0.0925