v3.26.1
Loans, Impaired Loans and Allowance for Credit Losses -Summary of Carrying Value of Exposures by Risk Rating (Detail) - CAD ($)
$ in Millions
Apr. 30, 2026
Jan. 31, 2026
Oct. 31, 2025
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL $ 764,584 $ 762,477 $ 778,508
Allowance for credit losses 7,150 7,002 7,463
Carrying value of loans net of ACL 757,434 $ 755,475 771,045
Residential mortgages [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 368,495   370,191
Allowance for credit losses 1,450   1,460
Carrying value of loans net of ACL 367,045   368,731
Residential mortgages [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 224,599   223,888
Residential mortgages [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 88,246   88,575
Residential mortgages [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 25,039   24,488
Residential mortgages [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 8,220   9,009
Residential mortgages [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,967   3,218
Residential mortgages [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 16,520   18,110
Residential mortgages [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,904   2,903
Personal loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 108,355   110,567
Allowance for credit losses 2,254   2,432
Carrying value of loans net of ACL 106,101   108,135
Personal loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 31,031   31,211
Personal loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 21,654   21,826
Personal loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 12,862   12,964
Personal loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 14,022   15,990
Personal loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,315   2,686
Personal loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 25,496   24,819
Personal loans [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 975   1,071
Credit Card [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 16,040   18,045
Allowance for credit losses 1,166   1,355
Carrying value of loans net of ACL 14,874   16,690
Credit Card [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,518   2,648
Credit Card [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,030   3,182
Credit Card [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,307   4,818
Credit Card [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,715   5,152
Credit Card [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1,105   1,224
Credit Card [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 1,365   1,021
Undrawn loan commitments retail [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments net of ACL 175,490   174,822
Undrawn loan commitments retail [Member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 133,759   126,936
Undrawn loan commitments retail [Member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 20,782   22,173
Undrawn loan commitments retail [Member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 7,393   9,582
Undrawn loan commitments retail [Member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 2,517   4,678
Undrawn loan commitments retail [Member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 291   365
Undrawn loan commitments retail [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 10,748   11,088
Total retail loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 668,380   673,625
Allowance for credit losses 4,870   5,247
Carrying value of loans net of ACL 663,510   668,378
Total retail loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 391,907   384,683
Total retail loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 133,712   135,756
Total retail loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 49,601   51,852
Total retail loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 28,474   34,829
Total retail loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 6,678   7,493
Total retail loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 54,129   55,038
Total retail loans [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,879   3,974
Business and government [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 271,694   279,705
Allowance for credit losses 2,280   2,216
Carrying value of loans net of ACL 269,414   277,489
Business and government [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 2,671   2,521
Business and government [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,729   3,270
Business and government [member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 137,662   140,271
Business and government [member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 123,519   129,168
Business and government [member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,113   4,475
Undrawn loan commitments business and government [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 315,090   311,347
Carrying value of undrawn loan commitments net of ACL 314,915   311,172
Allowance for credit losses 175   175
Undrawn loan commitments business and government [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 4,700   4,594
Undrawn loan commitments business and government [Member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 49   31
Undrawn loan commitments business and government [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 249,593   243,738
Undrawn loan commitments business and government [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 59,730   61,977
Undrawn loan commitments business and government [Member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 1,018   1,007
Total Non Retail Loans [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 586,784   591,052
Allowance for credit losses 2,455   2,391
Carrying value of loans net of ACL 584,329   588,661
Total Non Retail Loans [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 7,371   7,115
Total Non Retail Loans [Member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,778   3,301
Total Non Retail Loans [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 387,255   384,009
Total Non Retail Loans [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 183,249   191,145
Total Non Retail Loans [Member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 5,131   5,482
Stage one exposure [Member] | Residential mortgages [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 339,125   339,517
Allowance for credit losses 190   196
Carrying value of loans net of ACL 338,935   339,321
Stage one exposure [Member] | Residential mortgages [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 221,008   219,905
Stage one exposure [Member] | Residential mortgages [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 84,108   83,755
Stage one exposure [Member] | Residential mortgages [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 15,854   15,870
Stage one exposure [Member] | Residential mortgages [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,307   3,002
Stage one exposure [Member] | Residential mortgages [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 8   48
Stage one exposure [Member] | Residential mortgages [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 15,840   16,937
Stage one exposure [Member] | Personal loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 96,334   97,801
Allowance for credit losses 558   613
Carrying value of loans net of ACL 95,776   97,188
Stage one exposure [Member] | Personal loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 30,851   31,009
Stage one exposure [Member] | Personal loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 20,954   21,075
Stage one exposure [Member] | Personal loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 12,818   12,886
Stage one exposure [Member] | Personal loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 8,569   10,331
Stage one exposure [Member] | Personal loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 41   35
Stage one exposure [Member] | Personal loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 23,101   22,465
Stage one exposure [Member] | Credit Card [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 12,745   14,421
Allowance for credit losses 250   338
Carrying value of loans net of ACL 12,495   14,083
Stage one exposure [Member] | Credit Card [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,517   2,646
Stage one exposure [Member] | Credit Card [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,022   3,171
Stage one exposure [Member] | Credit Card [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,295   4,792
Stage one exposure [Member] | Credit Card [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1,992   3,210
Stage one exposure [Member] | Credit Card [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 7   20
Stage one exposure [Member] | Credit Card [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 912   582
Stage one exposure [Member] | Undrawn loan commitments retail [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments net of ACL 172,398   171,452
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 133,523   126,681
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 20,726   22,102
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 7,388   9,569
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 2,094   4,047
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 4   14
Stage one exposure [Member] | Undrawn loan commitments retail [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 8,663   9,039
Stage one exposure [Member] | Total retail loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 620,602   623,191
Allowance for credit losses 998   1,147
Carrying value of loans net of ACL 619,604   622,044
Stage one exposure [Member] | Total retail loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 387,899   380,241
Stage one exposure [Member] | Total retail loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 128,810   130,103
Stage one exposure [Member] | Total retail loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 40,355   43,117
Stage one exposure [Member] | Total retail loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 14,962   20,590
Stage one exposure [Member] | Total retail loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 60   117
Stage one exposure [Member] | Total retail loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 48,516   49,023
Stage one exposure [Member] | Business and government [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 257,550   263,280
Allowance for credit losses 704   713
Carrying value of loans net of ACL 256,846   262,567
Stage one exposure [Member] | Business and government [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 2,647   2,485
Stage one exposure [Member] | Business and government [member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 137,139   138,789
Stage one exposure [Member] | Business and government [member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 117,758   121,999
Stage one exposure [Member] | Business and government [member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 6   7
Stage one exposure [Member] | Undrawn loan commitments business and government [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 311,005   307,366
Carrying value of undrawn loan commitments net of ACL 310,880   307,225
Allowance for credit losses 125   141
Stage one exposure [Member] | Undrawn loan commitments business and government [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 4,699   4,593
Stage one exposure [Member] | Undrawn loan commitments business and government [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 248,402   242,637
Stage one exposure [Member] | Undrawn loan commitments business and government [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 57,904   60,136
Stage one exposure [Member] | Total Non Retail Loans [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 568,555   570,646
Allowance for credit losses 829   854
Carrying value of loans net of ACL 567,726   569,792
Stage one exposure [Member] | Total Non Retail Loans [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 7,346   7,078
Stage one exposure [Member] | Total Non Retail Loans [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 385,541   381,426
Stage one exposure [Member] | Total Non Retail Loans [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 175,662   182,135
Stage one exposure [Member] | Total Non Retail Loans [Member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 6   7
Stage two exposure [Member] | Residential mortgages [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 26,466   27,771
Allowance for credit losses 419   424
Carrying value of loans net of ACL 26,047   27,347
Stage two exposure [Member] | Residential mortgages [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,591   3,983
Stage two exposure [Member] | Residential mortgages [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,138   4,820
Stage two exposure [Member] | Residential mortgages [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 9,185   8,618
Stage two exposure [Member] | Residential mortgages [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 5,913   6,007
Stage two exposure [Member] | Residential mortgages [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,959   3,170
Stage two exposure [Member] | Residential mortgages [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 680   1,173
Stage two exposure [Member] | Personal loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 11,046   11,695
Allowance for credit losses 1,130   1,215
Carrying value of loans net of ACL 9,916   10,480
Stage two exposure [Member] | Personal loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 180   202
Stage two exposure [Member] | Personal loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 700   751
Stage two exposure [Member] | Personal loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 44   78
Stage two exposure [Member] | Personal loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 5,453   5,659
Stage two exposure [Member] | Personal loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 2,274   2,651
Stage two exposure [Member] | Personal loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 2,395   2,354
Stage two exposure [Member] | Credit Card [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 3,295   3,624
Allowance for credit losses 916   1,017
Carrying value of loans net of ACL 2,379   2,607
Stage two exposure [Member] | Credit Card [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1   2
Stage two exposure [Member] | Credit Card [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 8   11
Stage two exposure [Member] | Credit Card [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 12   26
Stage two exposure [Member] | Credit Card [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1,723   1,942
Stage two exposure [Member] | Credit Card [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1,098   1,204
Stage two exposure [Member] | Credit Card [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 453   439
Stage two exposure [Member] | Undrawn loan commitments retail [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments net of ACL 3,092   3,370
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 236   255
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 56   71
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 5   13
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 423   631
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 287   351
Stage two exposure [Member] | Undrawn loan commitments retail [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 2,085   2,049
Stage two exposure [Member] | Total retail loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 43,899   46,460
Allowance for credit losses 2,465   2,656
Carrying value of loans net of ACL 41,434   43,804
Stage two exposure [Member] | Total retail loans [member] | Very low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,008   4,442
Stage two exposure [Member] | Total retail loans [member] | Low probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,902   5,653
Stage two exposure [Member] | Total retail loans [member] | Medium probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 9,246   8,735
Stage two exposure [Member] | Total retail loans [member] | High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 13,512   14,239
Stage two exposure [Member] | Total retail loans [member] | Very High probability of default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 6,618   7,376
Stage two exposure [Member] | Total retail loans [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 5,613   6,015
Stage two exposure [Member] | Business and government [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 10,415   13,155
Allowance for credit losses 575   606
Carrying value of loans net of ACL 9,840   12,549
Stage two exposure [Member] | Business and government [member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 24   36
Stage two exposure [Member] | Business and government [member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 523   1,482
Stage two exposure [Member] | Business and government [member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 5,761   7,169
Stage two exposure [Member] | Business and government [member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 4,107   4,468
Stage two exposure [Member] | Undrawn loan commitments business and government [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 4,036   3,950
Carrying value of undrawn loan commitments net of ACL 3,986   3,916
Allowance for credit losses 50   34
Stage two exposure [Member] | Undrawn loan commitments business and government [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [1] 1   1
Stage two exposure [Member] | Undrawn loan commitments business and government [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 1,191   1,101
Stage two exposure [Member] | Undrawn loan commitments business and government [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 1,826   1,841
Stage two exposure [Member] | Undrawn loan commitments business and government [Member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL 1,018   1,007
Stage two exposure [Member] | Total Non Retail Loans [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 14,451   17,105
Allowance for credit losses 625   640
Carrying value of loans net of ACL 13,826   16,465
Stage two exposure [Member] | Total Non Retail Loans [Member] | Loans not graded [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [1] 25   37
Stage two exposure [Member] | Total Non Retail Loans [Member] | Investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 1,714   2,583
Stage two exposure [Member] | Total Non Retail Loans [Member] | Non investment grade [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 7,587   9,010
Stage two exposure [Member] | Total Non Retail Loans [Member] | Watch list [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL 5,125   5,475
Stage three exposure [Member] | Residential mortgages [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 2,904   2,903
Allowance for credit losses [2] 841   840
Carrying value of loans net of ACL [2] 2,063   2,063
Stage three exposure [Member] | Residential mortgages [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 2,904   2,903
Stage three exposure [Member] | Personal loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 975   1,071
Allowance for credit losses [2] 566   604
Carrying value of loans net of ACL [2] 409   467
Stage three exposure [Member] | Personal loans [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 975   1,071
Stage three exposure [Member] | Total retail loans [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 3,879   3,974
Allowance for credit losses [2] 1,407   1,444
Carrying value of loans net of ACL [2] 2,472   2,530
Stage three exposure [Member] | Total retail loans [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 3,879   3,974
Stage three exposure [Member] | Business and government [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 3,729   3,270
Allowance for credit losses [2] 1,001   897
Carrying value of loans net of ACL [2] 2,728   2,373
Stage three exposure [Member] | Business and government [member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 3,729   3,270
Stage three exposure [Member] | Undrawn loan commitments business and government [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [2] 49   31
Carrying value of undrawn loan commitments net of ACL [2] 49   31
Stage three exposure [Member] | Undrawn loan commitments business and government [Member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of undrawn loan commitments before ACL [2] 49   31
Stage three exposure [Member] | Total Non Retail Loans [Member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] 3,778   3,301
Allowance for credit losses [2] 1,001   897
Carrying value of loans net of ACL [2] 2,777   2,404
Stage three exposure [Member] | Total Non Retail Loans [Member] | Default [member]      
Disclosure of detailed information about financial instruments [line items]      
Carrying value of loans before ACL [2] $ 3,778   $ 3,301
[1] Portfolios where the customer account level ‘Probability of Default’ has not been determined have been included in the ‘Loans not graded’ category.
[2] Stage 3 includes purchased or originated credit-impaired loans.