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Derivative and Hedging Instruments - Summary of Effects of Derivatives Not Designated in Qualifying Hedge Accounting Relationships (Detail) - Non designated [Member] - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	CAD (1,024)	CAD (2,574)
Interest rate swaps [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	(927)	(141)
Interest rate futures [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	372	(26)
Interest rate options [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	(96)	(11)
Foreign currency swaps [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	529	(14)
Currency rate futures [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	(92)	263
Forward contracts [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	1,231	(88)
Equity futures [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	(2,190)	(2,387)
Equity contracts [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	153	(171)
Credit default swaps [Member]
Disclosure of detailed information about hedges [Line Items]
Derivative investment income (loss)	CAD (4)	CAD 1

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