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Financial Instruments - Financial Instrument Sensitivities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CAD ($)
Interest rate risk
Disclosure of detailed information about financial instruments [line items]
Increase interest rate 1%	1.00%	1.00%
Decrease interest rate 1%	1.00%	1.00%
Increase (decrease) to net earnings	$ (4)		$ (13)
Increase (decrease) to net earnings	4		13
Increase (decrease) to other comprehensive income	0		(29)
Increase (decrease) to other comprehensive income	0		39
Currency risk
Disclosure of detailed information about financial instruments [line items]
Weakening of the Canadian dollar by US$0.01		$ 0.01
Strengthening of the Canadian dollar by US$0.01		$ 0.01
Increase (decrease) to net earnings	(135)		(116)
Increase (decrease) to net earnings	131		114
Increase (decrease) to other comprehensive income	0		0
Increase (decrease) to other comprehensive income	$ 0		$ 0

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