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Derivatives Instruments (Realized and Unrealized Gains (Losses) with Respect to Other derivatives) (Details) - CAD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Equity derivative hedges, return of shares	2.8
FX forwards
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains (loss)	$ (24)	$ 3
Combined notional amount	448
FX forwards | OM&G
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss)	0	0
Realized gains (loss)	0	0
FX forwards | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss)	(18)	(15)
Realized gains (loss)	(6)	18
Equity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains (loss)	(22)	26
Equity derivatives | OM&G
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss)	(5)	11
Realized gains (loss)	(17)	15
Equity derivatives | Other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss)	0	0
Realized gains (loss)	$ 0	$ 0

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- Definition

Equity Derivative Hedges, Return Of Shares

+ References

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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