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Derivatives - Notional contract amounts and fair value of derivatives by product contract type held by HSBC (Details)
number in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 23,889,261 $ 27,619,214
Nominal contract amount of hedging instruments 192,457 208,905
Fair value of trading assets $ 374,606 $ 283,071
Fair value of hedging assets 2,223 1,663
Gross total fair values of derivative assets 376,829 284,734
Fair value of derivative assets 307,726 242,995
Fair value of trading liabilities 368,035 278,465
Fair value of hedging liabilities 4,069 2,771
Gross total fair values of derivative liabilities 372,104 281,236
Fair value of derivative liabilities 303,001 239,497
Derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Amounts offset on derivative liabilities (69,103) (41,739)
Derivatives    
Disclosure of detailed information about hedging instruments [line items]    
Amounts offset on derivative assets (69,103) (41,739)
Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 7,606,446 $ 8,207,629
Nominal contract amount of hedging instruments 35,021 31,899
Fair value of trading assets $ 106,696 $ 84,083
Fair value of hedging assets 309 455
Gross total fair values of derivative assets 107,005 84,538
Fair value of trading liabilities 108,903 84,498
Fair value of hedging liabilities 1,182 740
Gross total fair values of derivative liabilities 110,085 85,238
Interest rate    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 15,240,867 $ 17,895,349
Nominal contract amount of hedging instruments 157,435 177,006
Fair value of trading assets $ 249,204 $ 183,668
Fair value of hedging assets 1,914 1,208
Gross total fair values of derivative assets 251,118 184,876
Fair value of trading liabilities 236,594 175,095
Fair value of hedging liabilities 2,887 2,031
Gross total fair values of derivative liabilities 239,481 177,126
Equities    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 652,288 $ 1,077,347
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets $ 14,043 $ 9,053
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 14,043 9,053
Fair value of trading liabilities 15,766 11,237
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities 15,766 11,237
Credit    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 269,401 $ 345,644
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets $ 2,590 $ 4,744
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 2,590 4,744
Fair value of trading liabilities 3,682 5,597
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities 3,682 5,597
Commodity and other    
Disclosure of detailed information about hedging instruments [line items]    
Notional contract amount of trading instruments $ 120,259 $ 93,245
Nominal contract amount of hedging instruments 0 0
Fair value of trading assets $ 2,073 $ 1,523
Fair value of hedging assets 0 0
Gross total fair values of derivative assets 2,073 1,523
Fair value of trading liabilities 3,090 2,038
Fair value of hedging liabilities 0 0
Gross total fair values of derivative liabilities $ 3,090 $ 2,038