v3.26.1
Report of the directors financial review risk report - Wholesale analysis (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets $ 2,120,017 $ 2,064,949
Gross carrying amount | Wholesale | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets 1,978,717 1,940,746
Gross carrying amount | Wholesale | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 141,299 124,203
Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (2,105) (1,905)
Allowance for ECL | Wholesale | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (799) (690)
Allowance for ECL | Wholesale | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (1,307) (1,214)
Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,807) (1,778)
Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (656) (638)
Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (1,151) (1,139)
Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,390) (1,477)
Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (474) (522)
Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (916) (955)
Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2,764) (2,399)
Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (968) (830)
Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (1,797) (1,569)
Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Increase (decrease) in ECL 1,700  
Financial assets (6,214) (4,485)
Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (1,233) (971)
Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets $ (4,981) (3,514)
UK | Wholesale    
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
UK | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets $ 463,607 465,228
UK | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (681) (598)
UK | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (621) (571)
UK | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (527) (513)
UK | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (796) (680)
UK | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,657) (1,119)
US | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 216,936 208,425
US | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (165) (210)
US | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (144) (194)
US | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (112) (166)
US | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (214) (264)
US | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets $ (610) (563)
Hong Kong | Wholesale    
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
Hong Kong | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets $ 507,393 472,454
Hong Kong | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (508) (439)
Hong Kong | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (430) (401)
Hong Kong | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (295) (305)
Hong Kong | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (710) (570)
Hong Kong | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,513) (1,143)
Chinese mainland | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 134,513 133,814
Chinese mainland | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (181) (188)
Chinese mainland | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (152) (176)
Chinese mainland | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (103) (137)
Chinese mainland | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (259) (256)
Chinese mainland | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (531) (397)
Mexico | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 39,710 38,076
Mexico | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (59) (62)
Mexico | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (54) (58)
Mexico | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (41) (47)
Mexico | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (68) (76)
Mexico | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (124) (202)
UAE | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 67,950 62,827
UAE | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (120) (52)
UAE | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (91) (51)
UAE | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (85) (47)
UAE | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (172) (56)
UAE | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (356) (82)
France | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 197,768 196,137
France | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (120) (121)
France | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (112) (117)
France | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (95) (103)
France | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (140) (139)
France | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (245) (188)
Other geographies | Gross carrying amount | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 492,137 487,987
Other geographies | Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets (272) (234)
Other geographies | Allowance for ECL | Wholesale | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (202) (208)
Other geographies | Allowance for ECL | Wholesale | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (132) (158)
Other geographies | Allowance for ECL | Wholesale | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (406) (358)
Other geographies | Allowance for ECL | Wholesale | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets $ (1,178) $ (790)