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Derivatives - Notional contract amounts and fair value of derivatives by product contract type held by HSBC (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 27,008,765 $ 20,531,969
Nominal contract amount of hedging instruments 207,057 241,287
Fair value of trading assets 328,450 394,212
Fair value of hedging assets 1,793 3,215
Gross total fair values of derivative assets 330,243 397,427
Fair value of derivative assets 219,818 290,872
Fair value of trading liabilities 323,351 381,325
Fair value of hedging liabilities 3,895 5,049
Gross total fair values of derivative liabilities 327,246 386,374
Fair value of derivative liabilities 216,821 279,819
Derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Amounts offset on derivative liabilities (110,425) (106,555)
Derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Amounts offset on derivative assets (110,425) (106,555)
Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments 6,215,518 5,819,814
Nominal contract amount of hedging instruments 28,768 26,281
Fair value of trading assets 78,089 126,185
Fair value of hedging assets 428 1,228
Gross total fair values of derivative assets 78,517 127,413
Fair value of trading liabilities 74,915 118,813
Fair value of hedging liabilities 853 968
Gross total fair values of derivative liabilities 75,768 119,781
Interest rate    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments 19,751,577 13,729,757
Nominal contract amount of hedging instruments 178,289 215,006
Fair value of trading assets 235,430 253,398
Fair value of hedging assets 1,365 1,987
Gross total fair values of derivative assets 236,795 255,385
Fair value of trading liabilities 229,989 245,941
Fair value of hedging liabilities 3,042 4,081
Gross total fair values of derivative liabilities 233,031 250,022
Equities    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments 590,156 472,169
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets 9,353 7,410
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 9,353 7,410
Fair value of trading liabilities 11,845 9,240
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities 11,845 9,240
Credit    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments 391,798 448,220
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets 4,692 5,199
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 4,692 5,199
Fair value of trading liabilities 5,369 5,767
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities 5,369 5,767
Commodity and other    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments 59,716 62,009
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets 886 2,020
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 886 2,020
Fair value of trading liabilities 1,233 1,564
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities $ 1,233 $ 1,564