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Retained Earnings and Regulatory Capital Requirements - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
HSBC USA    
Common equity Tier 1 ratio:    
Capital Amount $ 13,036 $ 12,822
Well-Capitalized Ratio 0.045 0.045
Actual Ratio 0.131 0.130
Tier 1 capital ratio:    
Capital Amount $ 13,301 $ 13,087
Well-Capitalized Ratio 0.060 0.060
Actual Ratio 0.134 0.133
Total capital ratio:    
Capital Amount $ 15,650 $ 15,452
Well-Capitalized Ratio 0.100 0.100
Actual Ratio 0.157 0.157
Tier 1 leverage ratio:    
Capital Amount $ 13,301 $ 13,087
Well-Capitalized Ratio 0.040 0.040
Actual Ratio 0.080 0.077
Risk weighted assets:    
Capital Amount $ 99,563 $ 98,450
Adjusted quarterly average assets    
Capital Amount 167,189 170,527
HSBC Bank USA    
Common equity Tier 1 ratio:    
Capital Amount $ 15,694 $ 15,407
Well-Capitalized Ratio 0.065 0.065
Actual Ratio 0.164 0.161
Tier 1 capital ratio:    
Capital Amount $ 17,194 $ 16,907
Well-Capitalized Ratio 0.080 0.080
Actual Ratio 0.180 0.177
Total capital ratio:    
Capital Amount $ 19,298 $ 19,024
Well-Capitalized Ratio 0.100 0.100
Actual Ratio 0.201 0.199
Tier 1 leverage ratio:    
Capital Amount $ 17,194 $ 16,907
Well-Capitalized Ratio 0.050 0.050
Actual Ratio 0.105 0.102
Risk weighted assets:    
Capital Amount $ 95,788 $ 95,455
Adjusted quarterly average assets    
Capital Amount $ 163,099 $ 166,526