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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
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 2,855,948 $ 2,880,751
Off-balance sheet commitments 273,192 262,877
Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 273,371 263,103
Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (179) (226)
Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 187,837 184,989
Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 187,837 184,989
Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,045,814 1,037,987
Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 83,136 81,616
Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 97,302 88,639
Financial assets at amortised cost, category    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 97,302 88,639
Financial assets at amortised cost, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,676,167 2,584,710
Financial assets at amortised cost, category | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (12,068) (15,566)
Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,057,231 1,052,477
Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (11,417) (14,490)
Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 83,153 81,658
Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (17) (42)
Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 880,351 772,408
Financial assets at amortised cost, category | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (193) (175)
Financial assets at amortised cost, category | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 75,668 76,882
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,494,993 2,336,365
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (1,648) (2,414)
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 918,936 869,920
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (1,367) (1,974)
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 81,636 79,654
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (14) (33)
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 875,016 768,216
Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (91) (80)
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 160,756 227,405
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3,380) (5,445)
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 119,224 163,185
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3,119) (4,965)
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,517 2,004
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3) (9)
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,988 3,975
Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (54) (44)
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 20,101 20,621
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6,970) (7,585)
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 18,797 19,095
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6,867) (7,439)
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 304 177
Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (42) (42)
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 317 319
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (70) (122)
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 274 277
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (64) (112)
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 43 40
Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6) (9)
Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 347,203 399,717
Financial assets measured at fair value through other comprehensive income, category | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (96) (141)
Strong | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 94,211 85,474
Strong | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 62,701 59,392
Good | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 97,224 90,573
Good | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 65,031 62,664
Satisfactory | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 75,711 80,922
Satisfactory | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 56,446 59,666
Sub- standard | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 5,354 4,949
Sub- standard | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 3,327 2,837
Credit impaired | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 871 1,185
IFRS 9    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 654,991 677,308
Financial assets and off-balance sheet loan commitments 2,664,099 2,569,144
IFRS 9 | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,020,735 1,906,543
Off-balance sheet commitments 655,432 678,167
Financial assets and off-balance sheet loan commitments 2,676,167 2,584,710
IFRS 9 | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (11,627) (14,707)
Off-balance sheet commitments (441) (859)
Financial assets and off-balance sheet loan commitments (12,068) (15,566)
IFRS 9 | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 627,258 659,049
IFRS 9 | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 627,637 659,783
IFRS 9 | Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (379) (734)
IFRS 9 | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 27,733 18,259
IFRS 9 | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 27,795 18,384
IFRS 9 | Financial guarantees | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (62) (125)
IFRS 9 | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,057,231 1,052,477
IFRS 9 | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (11,417) (14,490)
IFRS 9 | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 83,153 81,658
IFRS 9 | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (17) (42)
IFRS 9 | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 880,351 772,408
IFRS 9 | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (193) (175)
IFRS 9 | – stage 1 | Non-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 594,308 604,195
IFRS 9 | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 594,473 604,485
IFRS 9 | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (165) (290)
IFRS 9 | – stage 1 | Non-credit impaired | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 24,921 14,053
IFRS 9 | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 24,932 14,090
IFRS 9 | – stage 1 | Non-credit impaired | Financial guarantees | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (11) (37)
IFRS 9 | Lifetime expected credit losses | Non-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 32,215 53,852
IFRS 9 | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 32,389 54,217
IFRS 9 | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (174) (365)
IFRS 9 | Lifetime expected credit losses | Non-credit impaired | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 2,608 3,962
IFRS 9 | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 2,638 4,024
IFRS 9 | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (30) (62)
IFRS 9 | Lifetime expected credit losses | 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 735 1,002
IFRS 9 | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 775 1,080
IFRS 9 | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (40) (78)
IFRS 9 | Lifetime expected credit losses | Credit impaired | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 204 243
IFRS 9 | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 225 269
IFRS 9 | Lifetime expected credit losses | Credit impaired | Financial guarantees | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments (21) (26)
IFRS 9 | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 1
IFRS 9 | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 (1)
IFRS 9 | Lifetime expected credit losses | – POCI | Financial guarantees    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 1
IFRS 9 | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 1
IFRS 9 | Lifetime expected credit losses | – POCI | Financial guarantees | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,045,814 1,037,987
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,057,231 1,052,477
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (11,417) (14,490)
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 83,136 81,616
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 83,153 81,658
IFRS 9 | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (17) (42)
IFRS 9 | Financial assets at amortised cost, category | Other    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 880,158 772,233
IFRS 9 | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 880,351 772,408
IFRS 9 | Financial assets at amortised cost, category | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (193) (175)
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 917,569 867,946
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 918,936 869,920
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (1,367) (1,974)
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 81,622 79,621
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 81,636 79,654
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (14) (33)
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 874,925 768,136
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 875,016 768,216
IFRS 9 | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (91) (80)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 116,105 158,220
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 119,224 163,185
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3,119) (4,965)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,514 1,995
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,517 2,004
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (3) (9)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,934 3,931
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,988 3,975
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (54) (44)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 11,930 11,656
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 18,797 19,095
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6,867) (7,439)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 262 135
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 304 177
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (42) (42)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 210 165
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 274 277
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (64) (112)
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 37 31
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 43 40
IFRS 9 | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (6) (9)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 345,173 391,762
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 345,269 391,903
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (96) (141)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 345,173 391,762
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 345,269 391,903
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (96) (141)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 343,040 390,105
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 343,107 390,193
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (67) (88)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,094 1,384
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,116 1,404
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (22) (20)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 234
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 257
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 (23)
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 39 39
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 46 49
IFRS 9 | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Allowance for ECL    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets (7) (10)
IFRS 9 | Strong | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 406,376 407,267
Financial assets and off-balance sheet loan commitments 1,798,075 1,668,047
IFRS 9 | Strong | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 389,865 400,911
IFRS 9 | Strong | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,511 6,356
IFRS 9 | Strong | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 387,434 396,028
IFRS 9 | Strong | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,351 6,286
IFRS 9 | Strong | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 2,431 4,883
IFRS 9 | Strong | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 160 70
IFRS 9 | Strong | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Strong | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Strong | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Strong | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 544,695 506,231
IFRS 9 | Strong | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 72,978 71,318
IFRS 9 | Strong | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 774,026 683,231
IFRS 9 | Strong | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 537,642 499,836
IFRS 9 | Strong | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 72,903 71,126
IFRS 9 | Strong | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 773,427 682,412
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 7,053 6,395
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 75 192
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 599 819
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 320,161 367,685
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 320,161 367,685
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 319,557 367,542
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 604 143
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Strong | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 141,199 162,533
Financial assets and off-balance sheet loan commitments 447,210 463,117
IFRS 9 | Good | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 136,297 157,339
IFRS 9 | Good | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4,902 5,194
IFRS 9 | Good | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 129,455 143,600
IFRS 9 | Good | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 4,469 4,431
IFRS 9 | Good | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 6,842 13,739
IFRS 9 | Good | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 433 763
IFRS 9 | Good | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Good | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Good | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Good | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 230,326 233,320
IFRS 9 | Good | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,037 5,496
IFRS 9 | Good | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 71,648 61,768
IFRS 9 | Good | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 206,645 199,138
IFRS 9 | Good | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 3,935 5,098
IFRS 9 | Good | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 70,508 61,218
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 23,681 34,182
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 102 398
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,140 550
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12,298 12,678
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12,298 12,678
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 12,196 12,585
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 102 93
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Good | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 97,724 96,101
Financial assets and off-balance sheet loan commitments 369,625 382,834
IFRS 9 | Satisfactory | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 92,558 90,784
IFRS 9 | Satisfactory | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 5,166 5,317
IFRS 9 | Satisfactory | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 76,043 63,592
IFRS 9 | Satisfactory | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 3,929 3,163
IFRS 9 | Satisfactory | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 16,515 27,192
IFRS 9 | Satisfactory | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,237 2,154
IFRS 9 | Satisfactory | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Satisfactory | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Satisfactory | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Satisfactory | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 233,739 256,584
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 5,020 3,568
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 33,142 26,581
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 169,809 165,507
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,788 3,357
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 30,997 24,532
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 63,930 91,077
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 232 211
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 2,145 2,049
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 11,677 10,409
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 11,677 10,409
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 11,354 10,066
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 323 343
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Satisfactory | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 9,133 10,915
Financial assets and off-balance sheet loan commitments 40,843 49,772
IFRS 9 | Sub- standard | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 8,142 9,668
IFRS 9 | Sub- standard | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 991 1,247
IFRS 9 | Sub- standard | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 1,541 1,265
IFRS 9 | Sub- standard | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 183 210
IFRS 9 | Sub- standard | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 6,601 8,403
IFRS 9 | Sub- standard | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 808 1,037
IFRS 9 | Sub- standard | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Sub- standard | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Sub- standard | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Sub- standard | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 29,404 36,970
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,118 1,276
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,188 611
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4,840 5,439
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 10 73
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 84 54
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 24,560 31,531
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,108 1,203
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,104 557
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 4 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,087 825
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,087 825
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 1,087 825
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Sub- standard | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets and off-balance sheet loan commitments 20,414 20,940
IFRS 9 | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 775 1,081
IFRS 9 | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 225 270
IFRS 9 | Credit impaired | – stage 1 | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Credit impaired | – stage 1 | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Credit impaired | Lifetime expected credit losses | Non-credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Credit impaired | Lifetime expected credit losses | Non-credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 0
IFRS 9 | Credit impaired | Lifetime expected credit losses | Credit impaired | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 775 1,080
IFRS 9 | Credit impaired | Lifetime expected credit losses | Credit impaired | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 225 269
IFRS 9 | Credit impaired | Lifetime expected credit losses | – POCI | Loans and other credit-related commitments | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 1
IFRS 9 | Credit impaired | Lifetime expected credit losses | – POCI | Financial guarantees | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Off-balance sheet commitments 0 1
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 19,067 19,372
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 347 217
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | – stage 1 | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Non-credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 18,797 19,095
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | Credit impaired | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 304 177
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to customers at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 270 277
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Loans and advances to banks at amortised cost | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets at amortised cost, category | Lifetime expected credit losses | – POCI | Other | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 43 40
IFRS 9 | Credit impaired | Financial assets measured at fair value through other comprehensive income, category | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 46 306
IFRS 9 | Credit impaired | Financial assets measured at fair value through other comprehensive income, category | – stage 1 | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Non-credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 0
IFRS 9 | Credit impaired | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | Credit impaired | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets 0 257
IFRS 9 | Credit impaired | Financial assets measured at fair value through other comprehensive income, category | Lifetime expected credit losses | – POCI | Debt securities | Gross carrying/nominal amount    
Disclosure of financial assets that are either past due or impaired [line items]    
Financial assets $ 46 $ 49