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Regulatory Capital - Capital Amounts and Ratios in Accordance With Current Banking Regulations (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
HSBC USA Inc [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Amount $ 20,262 $ 21,908
Capital Amount, Tier 1 capital 13,981 15,179
Capital Amount, Tier 1 common capital 11,574 12,773
Capital Amount, Tier 1 leverage capital 13,981 15,179
Risk Weighted Assets 105,534 119,099
Well-Capitalized Minimum Ratio, Total capital 10.00% 10.00%
Well-Capitalized Minimum Ratio, Tier 1 capital 6.00% 6.00%
Well-Capitalized Minimum Ratio, Tier 1 common capital 5.00% 5.00%
Well-Capitalized Minimum Ratio, Tier 1 leverage capital 3.00% 3.00%
Actual Ratio, Total Capital 19.20% 18.39%
Actual Ratio, Tier 1 Capital 13.25% 12.74%
Actual Ratio, Tier 1 common capital 10.97% 10.72%
Actual Ratio, Tier 1 leverage capital 7.35% 7.43%
HSBC Bank USA [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Amount 20,876 22,390
Capital Amount, Tier 1 capital 14,897 15,996
Capital Amount, Tier 1 common capital 14,897 15,996
Capital Amount, Tier 1 leverage capital 14,897 15,996
Risk Weighted Assets $ 102,938 $ 118,688
Well-Capitalized Minimum Ratio, Total capital 10.00% 10.00%
Well-Capitalized Minimum Ratio, Tier 1 capital 6.00% 6.00%
Well-Capitalized Minimum Ratio, Tier 1 common capital 5.00% 5.00%
Well-Capitalized Minimum Ratio, Tier 1 leverage capital 5.00% 5.00%
Actual Ratio, Total Capital 20.28% 18.86%
Actual Ratio, Tier 1 Capital 14.47% 13.48%
Actual Ratio, Tier 1 common capital 14.47% 13.48%
Actual Ratio, Tier 1 leverage capital 8.01% 7.98%