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Regulatory Capital - Schedule of Basel III Requirements and the PCA well-capitalized Thresholds (Details)
$ in Millions
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
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 $ 12,117 $ 5,042
Tier 1 risk-based capital, amount 10,377 4,380
Common equity Tier 1, amount 9,496 4,041
Tier 1 leverage, amount $ 10,377 $ 4,380
Total risk-based capital, Ratio 0.1447 0.1435
Tier 1 risk-based capital, Ratio 0.1239 0.1247
Common equity Tier 1, Ratio 0.1134 0.1150
Tier 1 leverage, Ratio 0.0955 0.0759
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 $ 11,925 $ 4,858
Tier 1 risk-based capital, amount 10,641 4,651
Common equity Tier 1, amount 10,641 4,651
Tier 1 leverage, amount $ 10,641 $ 4,651
Total risk-based capital, Ratio 0.1425 0.1385
Tier 1 risk-based capital, Ratio 0.1271 0.1326
Common equity Tier 1, Ratio 0.1271 0.1326
Tier 1 leverage, Ratio 0.0981 0.0807