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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, 2018
Jan. 01, 2018
[1]
Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments $ 33,819,683   $ 27,008,765
Nominal contract amount of hedging instruments 193,240   207,057
Fair value of trading assets 255,998   328,450
Fair value of hedging assets 1,538   1,793
Gross total fair values of derivative assets 257,536   330,243
Fair value of derivative assets 207,825 $ 219,818 219,818
Fair value of trading liabilities 252,632   323,351
Fair value of hedging liabilities 2,914   3,895
Gross total fair values of derivative liabilities 255,546   327,246
Fair value of derivative liabilities 205,835 $ 216,821 216,821
Derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Amounts offset on derivative liabilities (49,711)   (110,425)
Derivatives      
Disclosure of detailed information about hedging instruments [line items]      
Amounts offset on derivative assets (49,711)   (110,425)
Foreign exchange      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 7,552,462   6,215,518
Nominal contract amount of hedging instruments 29,969   28,768
Fair value of trading assets 85,959   78,089
Fair value of hedging assets 458   428
Gross total fair values of derivative assets 86,417   78,517
Fair value of trading liabilities 82,494   74,915
Fair value of hedging liabilities 653   853
Gross total fair values of derivative liabilities 83,147   75,768
Interest rate      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 24,589,916   19,751,577
Nominal contract amount of hedging instruments 163,271   178,289
Fair value of trading assets 155,293   235,430
Fair value of hedging assets 1,080   1,365
Gross total fair values of derivative assets 156,373   236,795
Fair value of trading liabilities 154,257   229,989
Fair value of hedging liabilities 2,261   3,042
Gross total fair values of derivative liabilities 156,518   233,031
Equities      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 1,256,550   590,156
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 10,198   9,353
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 10,198   9,353
Fair value of trading liabilities 10,750   11,845
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities 10,750   11,845
Credit      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 346,596   391,798
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 3,414   4,692
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 3,414   4,692
Fair value of trading liabilities 3,776   5,369
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities 3,776   5,369
Commodity and other      
Disclosure of detailed information about hedging instruments [line items]      
Notional contract amount of trading instruments 74,159   59,716
Nominal contract amount of hedging instruments 0   0
Fair value of trading assets 1,134   886
Fair value of hedging assets 0   0
Gross total fair values of derivative assets 1,134   886
Fair value of trading liabilities 1,355   1,233
Fair value of hedging liabilities 0   0
Gross total fair values of derivative liabilities $ 1,355   $ 1,233
[1] Balances at 1 January 2018 have been prepared in accordance with accounting policies referred to on page 263. 31 December 2017 balances have not been re-presented. Information regarding the effects of adoption of IFRS 9 can be found in Note 37.