Commitments and Contingencies - Narrative (Details) $ / shares in Units, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) review	Dec. 31, 2021 CAD ($)	Jul. 01, 2022	Dec. 31, 2021 CAD ($) review $ / shares	Dec. 02, 2021	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Dec. 01, 2020	Nov. 30, 2020	Dec. 31, 2019 CAD ($)	Jun. 30, 2018	Nov. 02, 2017	Apr. 28, 2017	Jul. 31, 2012
Loss Contingencies [Line Items]
Preliminary countervailing duty rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)													12.82%
Final determination countervailing duty rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)	18.07%			18.07%				19.10%				14.70%
Accumulated countervailing duty cash deposits made on softwood lumber exports	$ 339					$ 194
Preliminary anti-dumping rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)											4.59%
Final determination anti-dumping rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)					11.59%				1.15%			3.20%
Accumulated anti-dumping cash deposits made on softwood lumber exports	$ 58					49
Number of reviews pending | review	2			2
Other liabilities	$ 88					92
Legal hypothec on immovable and movable property	24			$ 30						$ 30
Maximum deficit from partial wind-up of pension plans to be funded	119	$ 150
Environmental Remediation Obligations [Abstract]
Environmental liabilities	13					15
Asset retirement obligations	36					25
Forecast
Loss Contingencies [Line Items]
Final determination countervailing duty rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)			15.48%
Final determination anti-dumping rate on certain Canadian softwood lumber imported to the U.S. market (as a percent)			4.76%
Fibrek
Loss Contingencies [Line Items]
Proportion of outstanding shares acquired (as a percent)														25.40%
Determined per share fair value of dissenting shareholders' shares | $ / shares				$ 1.99
Determined fair value of dissenting shareholders' shares				$ 31
Determined fair value of dissenting shareholders' shares including interest and indemnity				44
Amount accrued to be contingently distributed				14
Change in amount of contingent consideration	23	$ 30
Amount paid, contingent consideration, business combination	14			19
Softwood Lumber Duties Investigations
Loss Contingencies [Line Items]
Contingent loss recorded	0
Surety Bond
Loss Contingencies [Line Items]
Surety bonds outstanding	83
Standby Letters of Credit
Loss Contingencies [Line Items]
Surety bonds outstanding	53
Fibrek
Loss Contingencies [Line Items]
Other liabilities	$ 21			$ 27		$ 20	$ 25