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Derivatives - Notional contract amounts and fair value of derivatives by product contract type held by HSBC (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
[1]
Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments $ 30,956,327   $ 27,008,765
Nominal contract amount of hedging instruments 209,729   207,057
Fair value of trading assets 321,755   328,450
Fair value of hedging assets 2,060   1,793
Gross total fair values of derivative assets 323,815   330,243
Fair value of derivative assets 227,972 $ 219,818 219,818
Fair value of trading liabilities 315,525   323,351
Fair value of hedging liabilities 3,279   3,895
Gross total fair values of derivative liabilities 318,804   327,246
Fair value of derivative liabilities 222,961 $ 216,821 216,821
Derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Amounts offset on derivative liabilities (95,843)   (110,425)
Derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Amounts offset on derivative assets (95,843)   (110,425)
Foreign exchange      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 7,389,043   6,215,518
Nominal contract amount of hedging instruments 29,761   28,768
Fair value of trading assets 100,818   78,089
Fair value of hedging assets 401   428
Gross total fair values of derivative assets 101,219   78,517
Fair value of trading liabilities 96,192   74,915
Fair value of hedging liabilities 744   853
Gross total fair values of derivative liabilities 96,936   75,768
Interest rate      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 22,569,400   19,751,577
Nominal contract amount of hedging instruments 179,968   178,289
Fair value of trading assets 205,654   235,430
Fair value of hedging assets 1,659   1,365
Gross total fair values of derivative assets 207,313   236,795
Fair value of trading liabilities 204,042   229,989
Fair value of hedging liabilities 2,535   3,042
Gross total fair values of derivative liabilities 206,577   233,031
Equities      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 561,103   590,156
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 10,270   9,353
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 10,270   9,353
Fair value of trading liabilities 10,038   11,845
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities 10,038   11,845
Credit      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 358,277   391,798
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 3,592   4,692
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 3,592   4,692
Fair value of trading liabilities 4,036   5,369
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities 4,036   5,369
Commodity and other      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 78,504   59,716
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 1,421   886
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 1,421   886
Fair value of trading liabilities 1,217   1,233
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities $ 1,217   $ 1,233
[1] 9Balances at 1 January 2018 have been prepared in accordance with accounting policies referred to on page 84. 31 December 2017 balances have not been re-presented.