v3.26.1
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, 2026
Dec. 31, 2025
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments $ 2,895,153 $ 2,694,960
Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,022,105 988,399
Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 110,529 108,462
Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 778,050 690,477
Loan 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 757,030 669,499
Loan 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 20,179 20,391
Loan 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 837 583
Loan 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 4
Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 18,796 17,425
Financial guarantees | Stage 1 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,815 15,905
Financial guarantees | Stage 2 | Non-credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,790 1,354
Financial guarantees | Stage 2 | Credit impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 191 166
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 218,320 182,089
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 1,022,105 988,399
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 110,529 108,462
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 965,673 890,197
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 200,825 158,644
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 922,567 892,232
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 110,251 108,332
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 963,615 888,415
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 83,260 78,618
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 16,018 17,292
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 260 257
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 278 130
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 1,835 1,640
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 217 142
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 6 0
Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 391,385 386,370
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 390,733 385,476
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 652 894
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
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 2,907,516 2,706,154
Gross carrying amount | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 778,417 690,792
Gross carrying amount | Loan 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 757,187 669,648
Gross carrying amount | Loan 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 20,282 20,488
Gross carrying amount | Loan 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 944 652
Gross carrying amount | Loan 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 4
Gross carrying amount | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 18,884 17,476
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 16,825 15,913
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 1,802 1,371
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 257 192
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 2,907,516 2,706,154
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 1,033,846 999,091
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 110,539 108,469
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 965,830 890,326
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 2,771,827 2,575,821
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 923,849 893,433
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 110,258 108,336
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 963,708 888,491
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 109,875 104,578
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 25,468 25,418
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 346 337
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 85,657 80,936
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 24,004 24,389
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 336 333
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 280 132
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 1 1
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 1,854 1,651
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 262 184
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 6 0
Gross carrying amount | Debt instruments at FVOCI    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 391,414 386,400
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 386,831 383,568
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 390,760 385,504
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 654 896
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 0 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 2,006,725 1,838,884
Gross carrying amount | Strong | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 499,711 441,740
Gross carrying amount | Strong | Loan 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 496,331 437,973
Gross carrying amount | Strong | Loan 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 3,380 3,767
Gross carrying amount | Strong | Loan 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 | Loan 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 8,444 7,436
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 8,386 7,430
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 58 6
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 563,194 545,487
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 99,313 97,524
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 836,063 746,697
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 554,004 540,253
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 99,183 97,426
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 835,833 746,536
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 9,190 5,234
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 130 98
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 230 161
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 378,827 375,950
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 378,772 375,894
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 55 56
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 496,136 467,312
Gross carrying amount | Good | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 168,705 146,923
Gross carrying amount | Good | Loan 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 164,590 143,849
Gross carrying amount | Good | Loan 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 4,115 3,074
Gross carrying amount | Good | Loan 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 | Loan 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 3,931 4,145
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 3,785 4,040
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 146 105
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 224,358 215,781
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 5,991 6,222
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 93,151 94,241
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 203,968 194,680
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 5,972 6,215
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 92,403 93,759
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 20,390 21,101
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 19 7
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 748 482
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 5,847 2,592
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 5,839 2,592
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 8 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 347,288 341,861
Gross carrying amount | Satisfactory | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 100,155 91,400
Gross carrying amount | Satisfactory | Loan 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 91,296 82,145
Gross carrying amount | Satisfactory | Loan 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 8,859 9,255
Gross carrying amount | Satisfactory | Loan 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 | Loan 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 5,668 5,144
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 4,514 4,351
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 1,154 793
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 200,344 191,839
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 5,162 4,613
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 35,959 48,865
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 160,189 152,578
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 5,033 4,608
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 35,200 48,121
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 39,962 39,068
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 193 193
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 129 5
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 759 744
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 6,534 7,572
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 6,085 7,015
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 449 557
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 31,746 32,535
Gross carrying amount | Sub-standard | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 8,898 10,073
Gross carrying amount | Sub-standard | Loan 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 4,970 5,681
Gross carrying amount | Sub-standard | Loan 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 3,928 4,392
Gross carrying amount | Sub-standard | Loan 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 | Loan 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 584 559
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 140 92
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 444 467
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 21,803 21,455
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 72 109
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 389 339
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 5,688 5,922
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 70 87
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 272 75
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 16,115 15,533
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 2 22
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 117 264
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 206 286
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 64 3
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 142 283
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 25,621 25,562
Gross carrying amount | Credit impaired | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 948 656
Gross carrying amount | Credit impaired | Loan 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 | Loan 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 | Loan 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 944 652
Gross carrying amount | Credit impaired | Loan 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 4
Gross carrying amount | Credit impaired | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 257 192
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 257 192
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 24,147 24,529
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 1 1
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 268 184
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 24,004 24,389
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 143 140
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 1 1
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 262 184
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 6 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 0 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 0 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 (12,363) (11,194)
Allowance for ECL | Loan and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (367) (315)
Allowance for ECL | Loan 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 (157) (149)
Allowance for ECL | Loan 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 (103) (97)
Allowance for ECL | Loan 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 (107) (69)
Allowance for ECL | Loan 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
Allowance for ECL | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (88) (51)
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 (12) (17)
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 (66) (26)
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 (12,363) (11,194)
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 (11,741) (10,692)
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 (10) (7)
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 (157) (129)
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 (1,549) (1,438)
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 (1,282) (1,201)
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 (7) (4)
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 (93) (76)
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 (2,533) (2,445)
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 (8,205) (7,235)
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 (76) (76)
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 (2,397) (2,318)
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 (7,986) (7,097)
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 (76) (76)
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 (1) (1)
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 (19) (11)
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 (45) (42)
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 (29) (30)
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 (29) (30)
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 (27) (28)
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 (2) (2)
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 0 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