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Financial Instruments Risks - Progress of LCR Ratios (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
LCR 321.00% 413.00%
Bottom of range [member]    
Statement [Line Items]    
LCR 292.00% 410.00%
Weighted average [member]    
Statement [Line Items]    
LCR 313.00% 457.00%
Top of range [member]    
Statement [Line Items]    
LCR 354.00% 525.00%