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Retained Earnings and Regulatory Capital Requirements - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Preferred stock, par value (usd per share)   $ 0  
Payments for repurchase of redeemable preferred stock $ 1,265 $ 1,265 $ 300
6.50% Non-Cumulative Series H Preferred Stock [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
HSBC USA preferred stock dividend rate (percent) 6.50%    
Preferred stock, par value (usd per share) $ 1,000    
Floating Rate Non-Cumulative Series F Preferred Stock [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Preferred stock, par value (usd per share) 25    
Floating Rate Non-Cumulative Series G Preferred Stock [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Preferred stock, par value (usd per share) $ 1,000    
Hnah [Member] | 6.0 %, Non-Cumulative Series I Preferred Stock [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
HSBC USA preferred stock dividend rate (percent) 6.00%    
HSBC USA preferred stock issued (shares) 1,265    
HSBC USA preferred stock issued $ 1,265    
Preferred stock, redemption price per share (usd per share) $ 1,000,000