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Derivative and Hedging Instruments - Summary of Fair Value of Derivative Instruments by Remaining Term to Maturity (Detail) - CAD
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]    
Derivative assets CAD 15,569,000,000 CAD 23,672,000,000
Derivative liabilities 7,822,000,000 14,151,000,000
Remaining term to maturity (notional amounts) 336,773,000,000 370,198,000,000
Credit risk equivalent 12,262,000,000 15,638,000,000
Risk- weighted amount 1,457,000,000 2,194,000,000
Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 15,569,000,000 23,672,000,000
Derivative liabilities 7,822,000,000 14,151,000,000
Fair value, net 7,747,000,000 9,521,000,000
Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 285,787,000,000 318,597,000,000
Credit risk equivalent 7,344,000,000 10,855,000,000
Risk- weighted amount 905,000,000 1,592,000,000
Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 138,714,000,000 214,891,000,000
Credit risk equivalent 6,588,000,000 10,205,000,000
Risk- weighted amount 809,000,000 1,493,000,000
Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 108,104,000,000 68,455,000,000
Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 17,325,000,000 14,245,000,000
Credit risk equivalent 285,000,000 192,000,000
Risk- weighted amount 35,000,000 29,000,000
Interest rate swaps [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 11,551,000,000 11,616,000,000
Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 10,093,000,000 9,390,000,000
Credit risk equivalent 471,000,000 458,000,000
Risk- weighted amount 61,000,000 70,000,000
Interest rate swaps [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 14,839,000,000 23,536,000,000
Derivative liabilities 7,111,000,000 12,900,000,000
Fair value, net 7,728,000,000 10,636,000,000
Interest rate swaps [Member] | Fair value [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 13,379,000,000 19,327,000,000
Derivative liabilities 6,867,000,000 10,154,000,000
Fair value, net 6,512,000,000 9,173,000,000
Interest rate swaps [Member] | Fair value [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 245,000,000 3,507,000,000
Derivative liabilities 206,000,000 2,117,000,000
Fair value, net 39,000,000 1,390,000,000
Interest rate swaps [Member] | Fair value [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 903,000,000 326,000,000
Derivative liabilities 38,000,000 629,000,000
Fair value, net 865,000,000 (303,000,000)
Interest rate swaps [Member] | Fair value [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 312,000,000 376,000,000
Fair value, net 312,000,000 376,000,000
Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,181,000,000 1,422,000,000
Credit risk equivalent 101,000,000 62,000,000
Risk- weighted amount 12,000,000 9,000,000
Foreign exchange [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,157,000,000 4,729,000,000
Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 18,162,000,000 13,601,000,000
Credit risk equivalent 1,874,000,000 1,491,000,000
Risk- weighted amount 200,000,000 181,000,000
Foreign exchange [Member] | Fair value [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 12,000,000 13,000,000
Derivative liabilities 31,000,000 38,000,000
Fair value, net (19,000,000) (25,000,000)
Foreign exchange [Member] | Fair value [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 510,000,000 346,000,000
Derivative liabilities 1,483,000,000 2,120,000,000
Fair value, net (973,000,000) (1,774,000,000)
Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 606,000,000 662,000,000
Credit derivatives [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 14,000,000 18,000,000
Fair value, net 14,000,000 18,000,000
Equity contracts [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 12,158,000,000 16,072,000,000
Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 10,941,000,000 11,816,000,000
Credit risk equivalent 2,606,000,000 2,735,000,000
Risk- weighted amount 305,000,000 358,000,000
Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,781,000,000 3,299,000,000
Credit risk equivalent 337,000,000 495,000,000
Risk- weighted amount 35,000,000 54,000,000
Equity contracts [Member] | Fair value [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 769,000,000 626,000,000
Derivative liabilities 10,000,000 2,000,000
Fair value, net 759,000,000 624,000,000
Equity contracts [Member] | Fair value [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 60,000,000 64,000,000
Derivative liabilities 14,000,000 35,000,000
Fair value, net 46,000,000 29,000,000
Financial Instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 336,773,000,000 370,198,000,000
Credit risk equivalent 12,262,000,000 15,638,000,000
Risk- weighted amount 1,457,000,000 2,194,000,000
Financial Instruments [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 16,204,000,000 24,603,000,000
Derivative liabilities 8,649,000,000 15,095,000,000
Fair value, net 7,555,000,000 9,508,000,000
Accrued interest [Member] | Fair value [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 635,000,000 931,000,000
Derivative liabilities 827,000,000 944,000,000
Fair value, net (192,000,000) (13,000,000)
Less than 1 year [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 605,000,000 467,000,000
Derivative liabilities 224,000,000 593,000,000
Remaining term to maturity (notional amounts) 53,882,000,000 64,933,000,000
Less than 1 year [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 27,179,000,000 33,289,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 7,161,000,000 13,244,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 1,615,000,000 717,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 6,036,000,000 7,229,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 11,551,000,000 11,616,000,000
Less than 1 year [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 816,000,000 483,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,046,000,000 1,257,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,157,000,000 4,729,000,000
Less than 1 year [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 999,000,000 425,000,000
Less than 1 year [Member] | Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 38,000,000 47,000,000
Less than 1 year [Member] | Equity contracts [Member] | Futures [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 12,158,000,000 16,072,000,000
Less than 1 year [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 4,693,000,000 6,007,000,000
Less than 1 year [Member] | Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 2,612,000,000 3,107,000,000
Less than 1 year [Member] | Financial Instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 53,882,000,000 64,933,000,000
1 to 3 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 822,000,000 680,000,000
Derivative liabilities 149,000,000 595,000,000
3 to 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 889,000,000 719,000,000
Derivative liabilities 168,000,000 511,000,000
1 to 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 58,040,000,000 61,949,000,000
1 to 5 years [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 46,539,000,000 51,251,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 19,141,000,000 37,395,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 12,928,000,000 4,786,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 10,614,000,000 6,143,000,000
1 to 5 years [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 3,856,000,000 2,927,000,000
1 to 5 years [Member] | Foreign exchange [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 135,000,000 165,000,000
1 to 5 years [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 4,481,000,000 3,917,000,000
1 to 5 years [Member] | Credit derivatives [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 568,000,000 615,000,000
1 to 5 years [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 6,148,000,000 5,809,000,000
1 to 5 years [Member] | Equity contracts [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 169,000,000 192,000,000
1 to 5 years [Member] | Financial Instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 58,040,000,000 61,949,000,000
Over 5 years [Member]    
Disclosure of detailed information about hedges [Line Items]    
Derivative assets 13,253,000,000 21,806,000,000
Derivative liabilities 7,281,000,000 12,452,000,000
Remaining term to maturity (notional amounts) 224,851,000,000 243,316,000,000
Over 5 years [Member] | Interest rate swaps [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 212,069,000,000 234,057,000,000
Over 5 years [Member] | Interest rate swaps [Member] | OTC swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 112,412,000,000 164,252,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Cleared swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 93,561,000,000 62,952,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Forward contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 675,000,000 873,000,000
Over 5 years [Member] | Interest rate swaps [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 5,421,000,000 5,980,000,000
Over 5 years [Member] | Foreign exchange [Member] | Swap contracts [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 12,682,000,000 9,259,000,000
Over 5 years [Member] | Equity contracts [Member] | Options purchased [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) 100,000,000  
Over 5 years [Member] | Financial Instruments [Member]    
Disclosure of detailed information about hedges [Line Items]    
Remaining term to maturity (notional amounts) CAD 224,851,000,000 CAD 243,316,000,000