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Derivative Instruments - Summary of Notional Amounts (Detail) - CAD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Disclosure of financial assets [line items]
Total notional amounts	$ 11,888,377
Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	11,671,891
Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	216,486
Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	6,765,396
Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	6,622,186
Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	143,210
Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	3,285,154
Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3,213,317
Later than one year and not later than five years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	71,837
Over 5 years [member]
Disclosure of financial assets [line items]
Total notional amounts	1,837,827
Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,836,388
Over 5 years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,439
Interest rate derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	9,350,972
Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	9,314,422
Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	36,550
Interest rate derivatives [member] \| Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	4,922,770
Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	4,891,592
Interest rate derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	31,178
Interest rate derivatives [member] \| Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	2,775,367
Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,769,995
Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	5,372
Interest rate derivatives [member] \| Over 5 years [member]
Disclosure of financial assets [line items]
Total notional amounts	1,652,835
Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,652,835
Foreign exchange derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	2,080,031
Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,079,007
Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,024
Foreign exchange derivatives [member] \| Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	1,554,681
Foreign exchange derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,553,657
Foreign exchange derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,024
Foreign exchange derivatives [member] \| Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	347,802
Foreign exchange derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	347,802
Foreign exchange derivatives [member] \| Over 5 years [member]
Disclosure of financial assets [line items]
Total notional amounts	177,548
Foreign exchange derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	177,548
Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	11,804
Credit derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,704
Credit derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	6,326
Credit derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3,774
Equity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	316,395
Equity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	181,907
Equity derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	134,488
Equity derivatives [member] \| Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	196,630
Equity derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	117,883
Equity derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	78,747
Equity derivatives [member] \| Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	117,499
Equity derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	62,742
Equity derivatives [member] \| Later than one year and not later than five years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	54,757
Equity derivatives [member] \| Over 5 years [member]
Disclosure of financial assets [line items]
Total notional amounts	2,266
Equity derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,282
Equity derivatives [member] \| Over 5 years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	984
Precious metals and other commodity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	129,175
Precious metals and other commodity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	84,399
Precious metals and other commodity derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	44,424
Precious metals and other commodity derivatives [member] \| Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	89,611
Precious metals and other commodity derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	57,167
Precious metals and other commodity derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	32,261
Precious metals and other commodity derivatives [member] \| Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	38,160
Precious metals and other commodity derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	26,283
Precious metals and other commodity derivatives [member] \| Later than one year and not later than five years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	11,708
Precious metals and other commodity derivatives [member] \| Over 5 years [member]
Disclosure of financial assets [line items]
Total notional amounts	1,404
Precious metals and other commodity derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	949
Precious metals and other commodity derivatives [member] \| Over 5 years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	455
Held For Trading For Trading Purpose [member]
Disclosure of financial assets [line items]
Total notional amounts	10,806,893	$ 7,322,125
Held For Trading For Trading Purpose [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	10,590,457	7,108,729
Held For Trading For Trading Purpose [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	216,436	213,396
Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	8,388,060	5,299,972
Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	8,351,560	5,278,722
Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	36,500	21,250
Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	1,964,696	1,574,411
Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,963,672	1,573,700
Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,024	711
Held For Trading For Trading Purpose [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	11,804	8,532
Held For Trading For Trading Purpose [member] \| Equity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	313,161	323,306
Held For Trading For Trading Purpose [member] \| Equity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	178,673	163,965
Held For Trading For Trading Purpose [member] \| Equity derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	134,488	159,341
Held For Trading For Trading Purpose [member] \| Precious metals and other commodity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	129,172	115,904
Held For Trading For Trading Purpose [member] \| Precious metals and other commodity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	84,396	83,474
Held For Trading For Trading Purpose [member] \| Precious metals and other commodity derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	44,424	32,094
Held for hedging and held for trading for economic hedges [member]
Disclosure of financial assets [line items]
Total notional amounts	1,081,484	1,030,499
Held for hedging and held for trading for economic hedges [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,081,434	1,030,493
Held for hedging and held for trading for economic hedges [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	50	6
Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	962,912	941,169
Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	962,862	941,163
Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	50	6
Held for hedging and held for trading for economic hedges [member] \| Foreign exchange derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	115,335	86,941
Held for hedging and held for trading for economic hedges [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	115,335	86,941
Held for hedging and held for trading for economic hedges [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts		19
Held for hedging and held for trading for economic hedges [member] \| Equity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	3,234	2,357
Held for hedging and held for trading for economic hedges [member] \| Equity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3,234	2,357
Held for hedging and held for trading for economic hedges [member] \| Precious metals and other commodity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	3	13
Held for hedging and held for trading for economic hedges [member] \| Precious metals and other commodity derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3	13
Forward contract [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	12,314
Forward contract [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	11,943
Forward contract [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	370
Forward contract [member] \| Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1
Forward contract [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,141,387
Forward contract [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,107,993
Forward contract [member] \| Foreign exchange derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	31,812
Forward contract [member] \| Foreign exchange derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,582
Forward contract [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	12,132	9,420
Forward contract [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,126,831	851,206
Forward contract [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	182	55
Forward contract [member] \| Held for hedging and held for trading for economic hedges [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	14,556	14,723
Centrally cleared forward rate agreements [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	121,989
Centrally cleared forward rate agreements [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	85,716
Centrally cleared forward rate agreements [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	36,273
Centrally cleared forward rate agreements [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	121,989	88,699
Swap contract [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	348,609
Swap contract [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	60,103
Swap contract [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	173,279
Swap contract [member] \| Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	115,227
Swap contract [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	767,093
Swap contract [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	280,000
Swap contract [member] \| Foreign exchange derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	311,127
Swap contract [member] \| Foreign exchange derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	175,966
Swap contract [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	322,574	273,138
Swap contract [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	666,914	567,930
Swap contract [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	26,035	18,882
Swap contract [member] \| Held for hedging and held for trading for economic hedges [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	100,179	71,540
Centrally cleared swap contracts [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	8,560,338
Centrally cleared swap contracts [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	4,527,608
Centrally cleared swap contracts [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,499,849
Centrally cleared swap contracts [member] \| Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,532,881
Centrally cleared swap contracts [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	7,626,410	4,805,504
Centrally cleared swap contracts [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	933,928	921,539
Purchased options [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	133,135
Purchased options [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,121
Purchased options [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	102,507
Purchased options [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,121
Purchased options [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	28,507
Purchased options [member] \| Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,121
Purchased options [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	84,802
Purchased options [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	541
Purchased options [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	82,699
Purchased options [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	541
Purchased options [member] \| Foreign exchange derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,103
Purchased options [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	130,705	47,772
Purchased options [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	1,121	1,069
Purchased options [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	84,802	72,180
Purchased options [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	541	67
Purchased options [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,430	644
Written options [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	138,037
Written options [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	121
Written options [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	103,715
Written options [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	121
Written options [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	31,717
Written options [member] \| Interest rate derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,605
Written options [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	85,725
Written options [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	423
Written options [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	82,965
Written options [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	423
Written options [member] \| Foreign exchange derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,760
Written options [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	137,750	54,189
Written options [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	121	4,069
Written options [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	85,125	82,384
Written options [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	423	292
Written options [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	287	43
Written options [member] \| Held for hedging and held for trading for economic hedges [member] \| Foreign exchange derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	600	678
Futures contract [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	35,308
Futures contract [member] \| Interest rate derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	29,936
Futures contract [member] \| Interest rate derivatives [member] \| Later than one year and not later than five years [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	5,372
Futures contract [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	60
Futures contract [member] \| Foreign exchange derivatives [member] \| Within 1 year [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	60
Futures contract [member] \| Held For Trading For Trading Purpose [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	35,258	16,112
Futures contract [member] \| Held For Trading For Trading Purpose [member] \| Foreign exchange derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	60	352
Futures contract [member] \| Held for hedging and held for trading for economic hedges [member] \| Interest rate derivatives [member] \| Exchange traded [member]
Disclosure of financial assets [line items]
Total notional amounts	50	6
Credit default swap contracts - protection purchased [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3,164
Credit default swap contracts - protection purchased [member] \| Credit derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,565
Credit default swap contracts - protection purchased [member] \| Credit derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,414
Credit default swap contracts - protection purchased [member] \| Credit derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	185
Credit default swap contracts - protection purchased [member] \| Held For Trading For Trading Purpose [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	3,164	2,782
Credit default swap contracts - protection purchased [member] \| Held for hedging and held for trading for economic hedges [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts		19
Centrally cleared credit default swap contracts protection purchased [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	4,964
Centrally cleared credit default swap contracts protection purchased [member] \| Credit derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	36
Centrally cleared credit default swap contracts protection purchased [member] \| Credit derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,836
Centrally cleared credit default swap contracts protection purchased [member] \| Credit derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,092
Centrally cleared credit default swap contracts protection purchased [member] \| Held For Trading For Trading Purpose [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	4,964	3,071
Credit default swap contracts - protection sold [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	726
Credit default swap contracts - protection sold [member] \| Credit derivatives [member] \| Within 1 year [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	103
Credit default swap contracts - protection sold [member] \| Credit derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	520
Credit default swap contracts - protection sold [member] \| Credit derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	103
Credit default swap contracts - protection sold [member] \| Held For Trading For Trading Purpose [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	726	936
Centrally cleared credit default swap contracts protection sold [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,950
Centrally cleared credit default swap contracts protection sold [member] \| Credit derivatives [member] \| Later than one year and not later than five years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,556
Centrally cleared credit default swap contracts protection sold [member] \| Credit derivatives [member] \| Over 5 years [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	1,394
Centrally cleared credit default swap contracts protection sold [member] \| Held For Trading For Trading Purpose [member] \| Credit derivatives [member] \| Over-the-counter clearing house [member]
Disclosure of financial assets [line items]
Total notional amounts	2,950	1,743
Centrally cleared commodity derivatives [member] \| Precious metals and other commodity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	352
Centrally cleared commodity derivatives [member] \| Precious metals and other commodity derivatives [member] \| Within 1 year [member]
Disclosure of financial assets [line items]
Total notional amounts	183
Centrally cleared commodity derivatives [member] \| Precious metals and other commodity derivatives [member] \| Later than one year and not later than five years [member]
Disclosure of financial assets [line items]
Total notional amounts	169
Centrally cleared commodity derivatives [member] \| Held For Trading For Trading Purpose [member] \| Precious metals and other commodity derivatives [member]
Disclosure of financial assets [line items]
Total notional amounts	$ 352	$ 336