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Total Invested Assets and Related Net Investment Income - Put Option Liability Sensitivity Analysis (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)
Disclosure of detailed information about financial instruments [abstract]
10% decrease	$ 130
10% increase	$ (141)

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Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Ten Percent Decrease In EBITDA, Impact On Put Option Liability And Profit (Loss)

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Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Ten Percent Increase In EBITDA, Impact On Put Option Liability And Profit (Loss)

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