XML 283 R231.htm IDEA: XBRL DOCUMENT v3.19.1
Risk and Capital Management - Summary of Implementation of Basel III Rules (Detail)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule for Implementation of Basel III Rules [Line Items]      
Common Equity Tier I   4.50% 4.50%
Tier I   6.00% 6.00%
Total Capital   8.625% 9.25%
Additional Common Equity Tier I (ACP)   2.375% 1.50%
Conservation   1.875% 1.25%
Countercyclical   0.00% 0.00%
Systemic   0.50% 0.25%
Common Equity Tier I + ACP   6.875% 6.00%
Total Capital + ACP   11.00% 10.75%
Prudential Adjustments Deductions   100.00% 80.00%
Events after reporting period [member]      
Schedule for Implementation of Basel III Rules [Line Items]      
Common Equity Tier I 4.50%    
Tier I 6.00%    
Total Capital 8.00%    
Additional Common Equity Tier I (ACP) 3.50%    
Conservation 2.50%    
Countercyclical 0.00%    
Systemic 1.00%    
Common Equity Tier I + ACP 8.00%    
Total Capital + ACP 11.50%    
Prudential Adjustments Deductions 100.00%