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Securities - Schedule of Fair Value Measurement (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of financial assets [line items]    
Trading Securities $ 192,303 $ 168,926
FVTPL Securities 21,354 19,064
FVOCI Securities 113,209 93,702
Amortized Cost Securities 96,610 115,188
Total securities 423,476 396,880
Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 113,209 93,702
Amortized Cost Securities 90,448 106,461
Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 423,476 396,880
Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 125,825 111,370
U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 292,959 278,558
Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 4,692 6,952
Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 112,197 93,728
Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 96,610 $ 115,188
Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.28% 3.61%
Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.89% 2.19%
Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 12,311 $ 10,036
FVTPL Securities 1,619 403
Canadian federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 45,335 34,177
Amortized Cost Securities [1] 943 2,403
Canadian federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 44,894 33,892
Amortized Cost Securities [1] $ 949 $ 2,465
Canadian federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.53% 3.33%
Canadian federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.15% 1.81%
Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 9,035 $ 7,585
FVTPL Securities 1,578 1,578
Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,644 5,996
Amortized Cost Securities [1] 6,220 4,216
Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,525 5,939
Amortized Cost Securities [1] $ 6,182 $ 4,488
Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.23% 3.61%
Canadian provincial and municipal governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.07% 2.38%
U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 30,902 $ 24,248
FVTPL Securities 1,495 1,527
U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,809 16,965
Amortized Cost Securities [1] 40,432 51,319
U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,515 17,033
Amortized Cost Securities [1] $ 43,468 $ 55,421
U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.83% 4.06%
U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.74% 1.49%
U.S. states, municipalities and agencies [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,144 $ 565
U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,634 5,068
Amortized Cost Securities [1] 167 180
U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 5,622 5,125
Amortized Cost Securities [1] $ 165 $ 182
U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.17% 4.04%
U.S. states, municipalities and agencies [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 4.66% 4.65%
Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 4,126 $ 3,849
FVTPL Securities   25
Other governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,065 5,656
Amortized Cost Securities [1] 523 675
Other governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,039 5,643
Amortized Cost Securities [1] $ 525 $ 681
Other governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.07% 3.15%
Other governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.90% 1.80%
NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] $ 56,450 $ 40,995
FVTPL Securities [2] 18 21
NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 27,015 21,293
Amortized Cost Securities [1],[2] 34,838 38,619
NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 26,946 21,570
Amortized Cost Securities [1],[2] $ 37,770 $ 42,773
NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 4.03% 3.92%
NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 2.61% 2.58%
Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 11,614 $ 10,172
FVTPL Securities 8,908 8,780
Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,515 4,370
Amortized Cost Securities [1] 7,325 9,049
Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 4,491 4,391
Amortized Cost Securities [1] $ 7,551 $ 9,178
Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.26% 2.67%
Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 4.85% 4.57%
Trading loans [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 4,568 $ 5,493
Corporate equity [member]    
Disclosure of financial assets [line items]    
Trading Securities 62,153 65,983
FVTPL Securities 7,736 6,730
Corporate equity [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 192 177
Corporate equity [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 165 135
Within 1 year [member]    
Disclosure of financial assets [line items]    
Trading Securities 9,081  
FVTPL Securities 1,108  
Within 1 year [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,828  
Amortized Cost Securities 3,708  
Within 1 year [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 34,753  
Within 1 year [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 23,158  
Within 1 year [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 10,390  
Within 1 year [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 1,205  
Within 1 year [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,804  
Within 1 year [member] | Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 3,736  
Within 1 year [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.54%  
Within 1 year [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.18%  
Within 1 year [member] | Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,170  
FVTPL Securities 876  
Within 1 year [member] | Canadian federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 15,819  
Amortized Cost Securities [1] 532  
Within 1 year [member] | Canadian federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 15,795  
Amortized Cost Securities [1] $ 538  
Within 1 year [member] | Canadian federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.29%  
Within 1 year [member] | Canadian federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.43%  
Within 1 year [member] | Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 715  
FVTPL Securities 1  
Within 1 year [member] | Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 470  
Amortized Cost Securities [1] 719  
Within 1 year [member] | Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 470  
Amortized Cost Securities [1] $ 720  
Within 1 year [member] | Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.52%  
Within 1 year [member] | Canadian provincial and municipal governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.84%  
Within 1 year [member] | U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 4,123  
FVTPL Securities 4  
Within 1 year [member] | U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 845  
Amortized Cost Securities [1] 765  
Within 1 year [member] | U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 844  
Amortized Cost Securities [1] $ 773  
Within 1 year [member] | U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.61%  
Within 1 year [member] | U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.87%  
Within 1 year [member] | U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 398  
Within 1 year [member] | U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 399  
Within 1 year [member] | U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.89%  
Within 1 year [member] | Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 592  
Within 1 year [member] | Other governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,521  
Amortized Cost Securities [1] 186  
Within 1 year [member] | Other governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,521  
Amortized Cost Securities [1] $ 186  
Within 1 year [member] | Other governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.28%  
Within 1 year [member] | Other governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.76%  
Within 1 year [member] | NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] $ 1,103  
Within 1 year [member] | NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 111  
Amortized Cost Securities [1],[2] 1,119  
Within 1 year [member] | NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 112  
Amortized Cost Securities [1],[2] $ 1,127  
Within 1 year [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 2.46%  
Within 1 year [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 2.51%  
Within 1 year [member] | Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,377  
FVTPL Securities 227  
Within 1 year [member] | Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,664  
Amortized Cost Securities [1] 387  
Within 1 year [member] | Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,663  
Amortized Cost Securities [1] $ 392  
Within 1 year [member] | Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.48%  
Within 1 year [member] | Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.73%  
Within 1 year [member] | Trading loans [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1  
1 to 3 years [member]    
Disclosure of financial assets [line items]    
Trading Securities 17,231  
FVTPL Securities 297  
1 to 3 years [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 24,290  
Amortized Cost Securities 23,066  
1 to 3 years [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 65,493  
1 to 3 years [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 24,896  
1 to 3 years [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 39,787  
1 to 3 years [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 810  
1 to 3 years [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 24,131  
1 to 3 years [member] | Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 23,675  
1 to 3 years [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.86%  
1 to 3 years [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.62%  
1 to 3 years [member] | Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 2,342  
FVTPL Securities 7  
1 to 3 years [member] | Canadian federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 15,287  
Amortized Cost Securities [1] 376  
1 to 3 years [member] | Canadian federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 15,202  
Amortized Cost Securities [1] $ 376  
1 to 3 years [member] | Canadian federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.48%  
1 to 3 years [member] | Canadian federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.74%  
1 to 3 years [member] | Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 316  
FVTPL Securities 6  
1 to 3 years [member] | Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,061  
Amortized Cost Securities [1] 1,106  
1 to 3 years [member] | Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,041  
Amortized Cost Securities [1] $ 1,099  
1 to 3 years [member] | Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.05%  
1 to 3 years [member] | Canadian provincial and municipal governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.50%  
1 to 3 years [member] | U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 9,180  
1 to 3 years [member] | U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,797  
Amortized Cost Securities [1] 17,037  
1 to 3 years [member] | U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,769  
Amortized Cost Securities [1] $ 17,536  
1 to 3 years [member] | U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.88%  
1 to 3 years [member] | U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.74%  
1 to 3 years [member] | U.S. states, municipalities and agencies [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 34  
1 to 3 years [member] | U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 534  
1 to 3 years [member] | U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 538  
1 to 3 years [member] | U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.87%  
1 to 3 years [member] | Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,177  
1 to 3 years [member] | Other governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,624  
Amortized Cost Securities [1] 217  
1 to 3 years [member] | Other governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,607  
Amortized Cost Securities [1] $ 217  
1 to 3 years [member] | Other governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.49%  
1 to 3 years [member] | Other governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.96%  
1 to 3 years [member] | NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] $ 176  
FVTPL Securities [2] 11  
1 to 3 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 1,457  
Amortized Cost Securities [1],[2] 3,670  
1 to 3 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 1,451  
Amortized Cost Securities [1],[2] $ 3,783  
1 to 3 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 3.46%  
1 to 3 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 1.78%  
1 to 3 years [member] | Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 3,030  
FVTPL Securities 273  
1 to 3 years [member] | Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 530  
Amortized Cost Securities [1] 660  
1 to 3 years [member] | Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 523  
Amortized Cost Securities [1] $ 664  
1 to 3 years [member] | Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.69%  
1 to 3 years [member] | Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.97%  
1 to 3 years [member] | Trading loans [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 976  
3 to 5 years [member]    
Disclosure of financial assets [line items]    
Trading Securities 11,663  
FVTPL Securities 411  
3 to 5 years [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 35,677  
Amortized Cost Securities 13,793  
3 to 5 years [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 62,340  
3 to 5 years [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 16,194  
3 to 5 years [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 45,617  
3 to 5 years [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 529  
3 to 5 years [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 35,093  
3 to 5 years [member] | Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 14,589  
3 to 5 years [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.55%  
3 to 5 years [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.38%  
3 to 5 years [member] | Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,003  
FVTPL Securities 146  
3 to 5 years [member] | Canadian federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 10,271  
3 to 5 years [member] | Canadian federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 10,077  
3 to 5 years [member] | Canadian federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.78%  
3 to 5 years [member] | Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,494  
FVTPL Securities 19  
3 to 5 years [member] | Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 2,986  
Amortized Cost Securities [1] 1,506  
3 to 5 years [member] | Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 2,925  
Amortized Cost Securities [1] $ 1,495  
3 to 5 years [member] | Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.32%  
3 to 5 years [member] | Canadian provincial and municipal governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.86%  
3 to 5 years [member] | U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 3,237  
3 to 5 years [member] | U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 9,434  
Amortized Cost Securities [1] 11,601  
3 to 5 years [member] | U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 9,270  
Amortized Cost Securities [1] $ 12,377  
3 to 5 years [member] | U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.75%  
3 to 5 years [member] | U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.32%  
3 to 5 years [member] | U.S. states, municipalities and agencies [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 214  
3 to 5 years [member] | U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 733  
3 to 5 years [member] | U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 732  
3 to 5 years [member] | U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.06%  
3 to 5 years [member] | Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,348  
3 to 5 years [member] | Other governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 920  
Amortized Cost Securities [1] 120  
3 to 5 years [member] | Other governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 911  
Amortized Cost Securities [1] $ 122  
3 to 5 years [member] | Other governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.66%  
3 to 5 years [member] | Other governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 4.00%  
3 to 5 years [member] | NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] $ 467  
3 to 5 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 10,776  
Amortized Cost Securities [1],[2] 425  
3 to 5 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 10,628  
Amortized Cost Securities [1],[2] $ 455  
3 to 5 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 4.19%  
3 to 5 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 1.84%  
3 to 5 years [member] | Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 2,259  
FVTPL Securities 246  
3 to 5 years [member] | Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 557  
Amortized Cost Securities [1] 141  
3 to 5 years [member] | Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 550  
Amortized Cost Securities [1] $ 140  
3 to 5 years [member] | Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.35%  
3 to 5 years [member] | Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.94%  
3 to 5 years [member] | Trading loans [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,641  
5 to 10 years [member]    
Disclosure of financial assets [line items]    
Trading Securities 18,035  
FVTPL Securities 1,598  
5 to 10 years [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,484  
Amortized Cost Securities 13,445  
5 to 10 years [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 54,767  
5 to 10 years [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 15,622  
5 to 10 years [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 38,820  
5 to 10 years [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 325  
5 to 10 years [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 20,127  
5 to 10 years [member] | Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 14,650  
5 to 10 years [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.65%  
5 to 10 years [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 2.69%  
5 to 10 years [member] | Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 3,481  
FVTPL Securities 342  
5 to 10 years [member] | Canadian federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,958  
Amortized Cost Securities [1] 35  
5 to 10 years [member] | Canadian federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,820  
Amortized Cost Securities [1] $ 35  
5 to 10 years [member] | Canadian federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.08%  
5 to 10 years [member] | Canadian federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.12%  
5 to 10 years [member] | Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 2,007  
FVTPL Securities 116  
5 to 10 years [member] | Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,112  
Amortized Cost Securities [1] 2,889  
5 to 10 years [member] | Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,072  
Amortized Cost Securities [1] $ 2,868  
5 to 10 years [member] | Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.47%  
5 to 10 years [member] | Canadian provincial and municipal governments [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.45%  
5 to 10 years [member] | U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 6,135  
5 to 10 years [member] | U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 6,458  
Amortized Cost Securities [1] 7,980  
5 to 10 years [member] | U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 6,358  
Amortized Cost Securities [1] $ 8,992  
5 to 10 years [member] | U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.92%  
5 to 10 years [member] | U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 2.69%  
5 to 10 years [member] | U.S. states, municipalities and agencies [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 429  
5 to 10 years [member] | U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,423  
Amortized Cost Securities [1] 167  
5 to 10 years [member] | U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 3,408  
Amortized Cost Securities [1] $ 165  
5 to 10 years [member] | U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.02%  
5 to 10 years [member] | U.S. states, municipalities and agencies [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 4.66%  
5 to 10 years [member] | Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 740  
5 to 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] 928  
FVTPL Securities [2] 7  
5 to 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 3,834  
Amortized Cost Securities [1],[2] 2,317  
5 to 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 3,783  
Amortized Cost Securities [1],[2] $ 2,532  
5 to 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 3.90%  
5 to 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 1.69%  
5 to 10 years [member] | Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 2,365  
FVTPL Securities 1,133  
5 to 10 years [member] | Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,699  
Amortized Cost Securities [1] 57  
5 to 10 years [member] | Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 1,686  
Amortized Cost Securities [1] $ 58  
5 to 10 years [member] | Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.79%  
5 to 10 years [member] | Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.73%  
5 to 10 years [member] | Trading loans [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 1,950  
Over 10 years [member]    
Disclosure of financial assets [line items]    
Trading Securities 74,140  
FVTPL Securities 10,204  
Over 10 years [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 11,738  
Amortized Cost Securities 36,436  
Over 10 years [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 136,042  
Over 10 years [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 18,796  
Over 10 years [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 116,911  
Over 10 years [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 335  
Over 10 years [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 11,877  
Over 10 years [member] | Amortized Cost [Member] | Carrying amount [Member]    
Disclosure of financial assets [line items]    
Amortized Cost Securities $ 39,960  
Over 10 years [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.07%  
Over 10 years [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) 3.27%  
Over 10 years [member] | Canadian federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 4,315  
FVTPL Securities 248  
Over 10 years [member] | Canadian provincial and municipal governments [member]    
Disclosure of financial assets [line items]    
Trading Securities 4,503  
FVTPL Securities 1,436  
Over 10 years [member] | Canadian provincial and municipal governments [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 15  
Over 10 years [member] | Canadian provincial and municipal governments [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 17  
Over 10 years [member] | Canadian provincial and municipal governments [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.07%  
Over 10 years [member] | U.S. federal government [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 8,227  
FVTPL Securities 1,491  
Over 10 years [member] | U.S. federal government [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 275  
Amortized Cost Securities [1] 3,049  
Over 10 years [member] | U.S. federal government [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 274  
Amortized Cost Securities [1] $ 3,790  
Over 10 years [member] | U.S. federal government [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.64%  
Over 10 years [member] | U.S. federal government [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 3.96%  
Over 10 years [member] | U.S. states, municipalities and agencies [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 467  
Over 10 years [member] | U.S. states, municipalities and agencies [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 546  
Over 10 years [member] | U.S. states, municipalities and agencies [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 545  
Over 10 years [member] | U.S. states, municipalities and agencies [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 4.77%  
Over 10 years [member] | Other governments [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 269  
Over 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member]    
Disclosure of financial assets [line items]    
Trading Securities [2] 53,776  
Over 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 10,837  
Amortized Cost Securities [1],[2] 27,307  
Over 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities [2] 10,972  
Amortized Cost Securities [1],[2] $ 29,873  
Over 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) [2] 4.02%  
Over 10 years [member] | NHA MBS, U.S. agency MBS and CMO [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1],[2] 2.81%  
Over 10 years [member] | Corporate debt [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 2,583  
FVTPL Securities 7,029  
Over 10 years [member] | Corporate debt [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 65  
Amortized Cost Securities [1] 6,080  
Over 10 years [member] | Corporate debt [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 69  
Amortized Cost Securities [1] $ 6,297  
Over 10 years [member] | Corporate debt [member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Yield (%) 5.02%  
Over 10 years [member] | Corporate debt [member] | Financial assets at amortized cost securities [member]    
Disclosure of financial assets [line items]    
Yield (%) [1] 5.06%  
No maturity [member]    
Disclosure of financial assets [line items]    
Trading Securities $ 62,153  
FVTPL Securities 7,736  
Total securities 70,081 $ 72,890
No maturity [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 192  
No maturity [member] | Total carrying value of securities [member]    
Disclosure of financial assets [line items]    
Total securities 70,081  
No maturity [member] | Canadian Dollar [member]    
Disclosure of financial assets [line items]    
Total securities 27,159  
No maturity [member] | U.S. dollar [member]    
Disclosure of financial assets [line items]    
Total securities 41,434  
No maturity [member] | Other Currencies [member]    
Disclosure of financial assets [line items]    
Total securities 1,488  
No maturity [member] | Amortized Cost [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities 165  
No maturity [member] | Corporate equity [member]    
Disclosure of financial assets [line items]    
Trading Securities 62,153  
FVTPL Securities 7,736  
No maturity [member] | Corporate equity [member] | Fair Value [Member]    
Disclosure of financial assets [line items]    
FVOCI Securities $ 192  
[1] The carrying values of securities that are part of fair value hedging relationships are adjusted for related gains (losses) on hedge contracts.
[2] These amounts are either supported by insured mortgages or issued by U.S. agencies and government-sponsored enterprises. NHA refers to the National Housing Act, MBS refers to mortgage-backed securities and CMO refers to collateralized mortgage obligations.