v3.26.1
Report of the directors financial review risk report - Retail analysis (Details) - Retail - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Gross carrying amount    
Disclosure of financial assets [line items]    
Financial assets $ 422,642 $ 421,712
Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 375,822 374,464
Gross carrying amount | Mortgages | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets 356,882 353,960
Gross carrying amount | Mortgages | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 16,432 18,056
Gross carrying amount | Mortgages | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 2,508 2,448
Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 24,700 24,990
Gross carrying amount | Credit cards | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets 20,858 21,258
Gross carrying amount | Credit cards | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 3,557 3,450
Gross carrying amount | Credit cards | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 285 282
Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 22,120 22,258
Gross carrying amount | Other financial assets measured at amortised cost | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets 19,136 19,494
Gross carrying amount | Other financial assets measured at amortised cost | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 2,378 2,177
Gross carrying amount | Other financial assets measured at amortised cost | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets 606 587
Allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2,707) (2,688)
Allowance for ECL | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2,652) (2,646)
Allowance for ECL | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2,560) (2,570)
Allowance for ECL | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2,774) (2,735)
Allowance for ECL | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (3,803) (3,637)
Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (448) (446)
Allowance for ECL | Mortgages | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (58) (54)
Allowance for ECL | Mortgages | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (105) (106)
Allowance for ECL | Mortgages | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (285) (286)
Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (431) (432)
Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (53) (53)
Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (98) (97)
Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (280) (282)
Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (408) (412)
Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (46) (50)
Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (90) (88)
Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (272) (274)
Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (469) (462)
Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (64) (61)
Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (114) (108)
Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (291) (293)
Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (714) (714)
Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (161) (161)
Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (221) (216)
Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (332) (337)
Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (1,313) (1,304)
Allowance for ECL | Credit cards | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (365) (353)
Allowance for ECL | Credit cards | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (724) (731)
Allowance for ECL | Credit cards | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (224) (220)
Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,288) (1,290)
Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (355) (347)
Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (709) (723)
Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (224) (220)
Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,252) (1,261)
Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (340) (335)
Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (688) (706)
Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (224) (220)
Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,338) (1,321)
Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (377) (366)
Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (737) (735)
Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (224) (220)
Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,777) (1,693)
Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (624) (553)
Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (919) (913)
Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (234) (227)
Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (946) (938)
Allowance for ECL | Other financial assets measured at amortised cost | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (256) (253)
Allowance for ECL | Other financial assets measured at amortised cost | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (411) (403)
Allowance for ECL | Other financial assets measured at amortised cost | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (279) (282)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (933) (924)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (250) (249)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (404) (393)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (279) (282)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (900) (897)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (233) (233)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (388) (382)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (279) (282)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (967) (952)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (267) (265)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (421) (405)
Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (279) (282)
Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (1,312) (1,230)
Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 1    
Disclosure of financial assets [line items]    
Financial assets (495) (444)
Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL | Non-credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (525) (494)
Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL | Credit impaired | Stage 2    
Disclosure of financial assets [line items]    
Financial assets (292) (292)
UK | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 184,494 183,128
UK | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 8,307 8,317
UK | Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 9,706 9,513
UK | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (113) (132)
UK | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (106) (124)
UK | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (95) (117)
UK | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (121) (138)
UK | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (244) (274)
UK | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (407) (356)
UK | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (401) (354)
UK | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (380) (338)
UK | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (413) (355)
UK | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (507) (419)
UK | Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (293) (265)
UK | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (282) (261)
UK | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (257) (238)
UK | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (306) (276)
UK | Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (463) (370)
Mexico | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 8,528 8,430
Mexico | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 2,136 2,322
Mexico | Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 3,290 3,727
Mexico | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (211) (190)
Mexico | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (207) (188)
Mexico | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (200) (180)
Mexico | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (214) (193)
Mexico | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (251) (237)
Mexico | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (368) (407)
Mexico | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (364) (403)
Mexico | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (359) (398)
Mexico | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (368) (409)
Mexico | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (493) (514)
Mexico | Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (411) (437)
Mexico | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (411) (437)
Mexico | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (408) (435)
Mexico | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (414) (442)
Mexico | Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (565) (589)
Hong Kong | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 107,792 106,736
Hong Kong | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 9,863 9,739
Hong Kong | Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 6,269 6,085
Hong Kong | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (2) (5)
Hong Kong | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2) (4)
Hong Kong | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (2) (3)
Hong Kong | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (3) (6)
Hong Kong | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (5) (13)
Hong Kong | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (299) (313)
Hong Kong | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (291) (306)
Hong Kong | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (286) (300)
Hong Kong | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (309) (324)
Hong Kong | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (467) (496)
Hong Kong | Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (146) (146)
Hong Kong | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (146) (137)
Hong Kong | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (142) (136)
Hong Kong | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (148) (144)
Hong Kong | Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (169) (173)
UAE | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 2,436 2,306
UAE | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 557 591
UAE | Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 556 620
UAE | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (12) (6)
UAE | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (11) (6)
UAE | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (11) (6)
UAE | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (12) (6)
UAE | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (22) (7)
UAE | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (55) (39)
UAE | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (50) (39)
UAE | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (49) (38)
UAE | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (63) (40)
UAE | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (89) (46)
UAE | Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (17) (12)
UAE | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (16) (11)
UAE | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (15) (11)
UAE | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (19) (12)
UAE | Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (24) (13)
US | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 15,368 17,797
US | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 178 187
US | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (5) (4)
US | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (5) (4)
US | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (4) (4)
US | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (5) (5)
US | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (8) (8)
US | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (15) (14)
US | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (15) (14)
US | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (15) (14)
US | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (15) (14)
US | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (18) (16)
Other geographies | Gross carrying amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 57,204 56,067
Other geographies | Gross carrying amount | Credit cards    
Disclosure of financial assets [line items]    
Financial assets 3,659 3,834
Other geographies | Gross carrying amount | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 2,299 2,313
Other geographies | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (105) (109)
Other geographies | Allowance for ECL | Mortgages | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (100) (106)
Other geographies | Allowance for ECL | Mortgages | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (96) (102)
Other geographies | Allowance for ECL | Mortgages | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (114) (114)
Other geographies | Allowance for ECL | Mortgages | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (184) (175)
Other geographies | Allowance for ECL | Credit cards    
Disclosure of financial assets [line items]    
Financial assets (169) (175)
Other geographies | Allowance for ECL | Credit cards | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (167) (174)
Other geographies | Allowance for ECL | Credit cards | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (163) (173)
Other geographies | Allowance for ECL | Credit cards | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (170) (179)
Other geographies | Allowance for ECL | Credit cards | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (203) (202)
Other geographies | Allowance for ECL | Other financial assets measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets (79) (78)
Other geographies | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (78) (78)
Other geographies | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (78) (77)
Other geographies | Allowance for ECL | Other financial assets measured at amortised cost | Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets (80) (78)
Other geographies | Allowance for ECL | Other financial assets measured at amortised cost | Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Financial assets $ (91) $ (85)