v3.25.2
Report of the directors financial review risk report - Distribution of financial instruments to which the impairment requirements in IFRS 9 are applied, by credit quality and stage allocation (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments $ 2,687,726 $ 2,497,173
Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 981,722 930,658
Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 107,582 102,039
Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 691,353 619,019
Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 668,036 597,094
Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 22,363 21,054
Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 951 868
Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 3 3
Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,561 16,969
Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 14,496 15,345
Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,772 1,392
Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 293 232
Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Debt instruments measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 166,209 153,973
Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 981,722 930,658
Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 107,582 102,039
Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 890,508 828,488
Debt instruments measured at amortised cost | Debt instruments measured at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 144,966 131,825
Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 851,488 823,342
Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 107,418 101,843
Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 888,349 826,557
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 112,586 90,702
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 17,406 16,575
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 242 39
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 164 196
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,994 1,801
Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 165 130
Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 402,487 353,855
Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 401,360 352,971
Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,101 884
Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 26 0
Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 2,698,402 2,507,370
Gross carrying amount | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 691,705 619,367
Gross carrying amount | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 668,179 597,231
Gross carrying amount | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 22,482 21,175
Gross carrying amount | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,040 958
Gross carrying amount | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4 3
Gross carrying amount | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,605 16,998
Gross carrying amount | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 14,506 15,353
Gross carrying amount | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,780 1,397
Gross carrying amount | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 319 248
Gross carrying amount | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Debt instruments measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,698,402 2,507,370
Gross carrying amount | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 991,865 940,373
Gross carrying amount | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 107,597 102,052
Gross carrying amount | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 890,630 828,580
Gross carrying amount | Debt instruments measured at amortised cost | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,531,205 2,365,477
Gross carrying amount | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 852,669 824,420
Gross carrying amount | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 107,428 101,852
Gross carrying amount | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 888,423 826,621
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 141,777 117,824
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 25,108 23,976
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 312 93
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 115,338 93,248
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 23,550 22,615
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 308 90
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 166 198
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 3 2
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,011 1,806
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 196 153
Gross carrying amount | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 402,550 353,909
Gross carrying amount | Debt instruments at FVOCI | Debt instruments measured at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 395,908 346,124
Gross carrying amount | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 401,397 353,002
Gross carrying amount | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,122 907
Gross carrying amount | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31 0
Gross carrying amount | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 1,831,754 1,717,942
Gross carrying amount | Strong | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 441,769 400,120
Gross carrying amount | Strong | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 439,548 398,779
Gross carrying amount | Strong | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 2,221 1,341
Gross carrying amount | Strong | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Strong | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Strong | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 7,265 7,365
Gross carrying amount | Strong | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 7,130 7,352
Gross carrying amount | Strong | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 135 13
Gross carrying amount | Strong | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Strong | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 531,379 515,266
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 95,955 92,621
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 755,386 702,570
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 510,598 498,415
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 95,880 92,528
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 755,052 702,373
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 20,781 16,851
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 75 93
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 334 197
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 376,762 336,313
Gross carrying amount | Strong | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 376,703 336,264
Gross carrying amount | Strong | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 59 49
Gross carrying amount | Strong | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Strong | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 457,659 418,694
Gross carrying amount | Good | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 150,302 131,396
Gross carrying amount | Good | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 144,242 125,956
Gross carrying amount | Good | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 6,060 5,440
Gross carrying amount | Good | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Good | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Good | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4,353 4,263
Gross carrying amount | Good | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 3,942 4,192
Gross carrying amount | Good | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 411 71
Gross carrying amount | Good | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Good | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 210,722 193,080
Gross carrying amount | Good | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 5,377 4,255
Gross carrying amount | Good | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 86,905 85,700
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 180,542 170,420
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 5,340 4,226
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 86,039 85,032
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 30,180 22,660
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 37 29
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 866 668
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12,041 9,448
Gross carrying amount | Good | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 11,973 9,448
Gross carrying amount | Good | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 68 0
Gross carrying amount | Good | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Good | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 348,468 312,735
Gross carrying amount | Satisfactory | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 88,854 77,220
Gross carrying amount | Satisfactory | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 78,922 67,949
Gross carrying amount | Satisfactory | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 9,932 9,271
Gross carrying amount | Satisfactory | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Satisfactory | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Satisfactory | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4,117 4,399
Gross carrying amount | Satisfactory | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 3,304 3,625
Gross carrying amount | Satisfactory | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 813 774
Gross carrying amount | Satisfactory | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Satisfactory | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 201,620 186,416
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 6,111 5,040
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 47,766 39,660
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 155,546 150,818
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 6,076 4,981
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 47,083 38,977
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 45,881 35,598
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 193 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 35 59
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 683 683
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 8,630 7,768
Gross carrying amount | Satisfactory | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 8,141 7,290
Gross carrying amount | Satisfactory | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 489 478
Gross carrying amount | Satisfactory | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Satisfactory | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 35,294 33,930
Gross carrying amount | Sub-standard | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 9,736 9,670
Gross carrying amount | Sub-standard | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 5,467 4,547
Gross carrying amount | Sub-standard | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4,269 5,123
Gross carrying amount | Sub-standard | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Sub-standard | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Sub-standard | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 551 723
Gross carrying amount | Sub-standard | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 130 184
Gross carrying amount | Sub-standard | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 421 539
Gross carrying amount | Sub-standard | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Sub-standard | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 24,479 22,906
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 151 134
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 377 497
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 5,983 4,767
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 132 117
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 249 239
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 18,496 18,139
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 19 17
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 128 258
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 5,086 380
Gross carrying amount | Sub-standard | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,580 0
Gross carrying amount | Sub-standard | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 506 380
Gross carrying amount | Sub-standard | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Sub-standard | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 25,227 24,069
Gross carrying amount | Credit impaired | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,044 961
Gross carrying amount | Credit impaired | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Credit impaired | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Credit impaired | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,040 958
Gross carrying amount | Credit impaired | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4 3
Gross carrying amount | Credit impaired | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 319 248
Gross carrying amount | Credit impaired | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Credit impaired | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Credit impaired | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 319 248
Gross carrying amount | Credit impaired | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 23,665 22,705
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 3 2
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 196 153
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 23,550 22,615
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 115 90
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 3 2
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 196 153
Gross carrying amount | Credit impaired | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31 0
Gross carrying amount | Credit impaired | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Gross carrying amount | Credit impaired | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 31 0
Gross carrying amount | Credit impaired | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments (10,676) (10,197)
Allowance for ECL | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (352) (348)
Allowance for ECL | Loans and other credit-related commitments | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (143) (137)
Allowance for ECL | Loans and other credit-related commitments | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (119) (121)
Allowance for ECL | Loans and other credit-related commitments | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (89) (90)
Allowance for ECL | Loans and other credit-related commitments | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (1) 0
Allowance for ECL | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (44) (29)
Allowance for ECL | Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (10) (8)
Allowance for ECL | Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (8) (5)
Allowance for ECL | Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (26) (16)
Allowance for ECL | Financial guarantees | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Allowance for ECL | Debt instruments measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (10,676) (10,197)
Allowance for ECL | Debt instruments measured at amortised cost | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (10,143) (9,715)
Allowance for ECL | Debt instruments measured at amortised cost | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (15) (13)
Allowance for ECL | Debt instruments measured at amortised cost | Other financial assets measured at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (122) (92)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (1,418) (1,296)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (1,181) (1,078)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 1 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (10) (9)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 1 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (74) (64)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (2,898) (2,679)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6,293) (6,171)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (67) (51)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (2,752) (2,546)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6,144) (6,040)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to customers at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (66) (51)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (2) (2)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3) (2)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Loans and advances to banks at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (17) (5)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (31) (23)
Allowance for ECL | Debt instruments measured at amortised cost | Stage 2 | Other financial assets measured at amortised cost | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Allowance for ECL | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (63) (54)
Allowance for ECL | Debt instruments at FVOCI | Debt instruments measured at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (63) (54)
Allowance for ECL | Debt instruments at FVOCI | Stage 1 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (37) (31)
Allowance for ECL | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (21) (23)
Allowance for ECL | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (5) 0
Allowance for ECL | Debt instruments at FVOCI | Stage 2 | Debt instruments measured at FVOCI | POCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 0 $ 0