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Regulatory Requirements - Additional Information (Detail) - USD ($)
$ in Billions
Jan. 01, 2019
Jan. 01, 2016
Jan. 01, 2015
Dec. 31, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement Ratio 8.50%   6.00%  
Total Risk Based Capital (to Risk Weighted Assets), Minimum Capital Requirement Ratio 10.50%   8.00%  
Leverage Ratio (Total Assets), Minimum Capital Requirement Ratio 4.00%   4.00%  
Initial Capital Requirement Phase-In Period     4 years  
New Capital Conservation Buffer Requirement (to Risk Weighted Assets), Ratio 2.50% 0.625%    
Common Stock        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement Ratio 7.00%   4.50%  
Maximum        
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]        
Consolidated assets threshold limit not to consolidated regulatory capital requirements       $ 3