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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details) - HSBC USA
$ in Millions
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Common equity Tier 1 ratio:    
Capital Amount $ 15,680 $ 15,341
Well-Capitalized Ratio 0.045 0.045
Actual Ratio 0.151 0.151
Tier 1 capital ratio:    
Capital Amount $ 16,945 $ 16,606
Well-Capitalized Ratio 0.060 0.060
Actual Ratio 0.163 0.163
Total capital ratio:    
Capital Amount $ 19,162 $ 18,821
Well-Capitalized Ratio 0.100 0.100
Actual Ratio 0.185 0.185
Tier 1 leverage ratio:    
Capital Amount $ 16,945 $ 16,606
Well-Capitalized Ratio 0.040 0.040
Actual Ratio 0.092 0.085
Risk weighted assets:    
Capital Amount $ 103,826 $ 101,827
Adjusted quarterly average assets    
Capital Amount 183,389 194,469
Capital Amount $ 18,010 $ 17,665
Well-Capitalized Ratio 0.065 0.065
Actual Ratio 0.177 0.176
Capital Amount $ 20,510 $ 20,165
Well-Capitalized Ratio 0.080 0.080
Actual Ratio 0.201 0.201
Capital Amount $ 22,502 $ 22,157
Well-Capitalized Ratio 0.100 0.100
Actual Ratio 0.221 0.221
Capital Amount $ 20,510 $ 20,165
Well-Capitalized Ratio 0.050 0.050
Actual Ratio 0.113 0.105
Capital Amount $ 101,991 $ 100,363
Capital Amount $ 181,194 $ 192,521