Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2020	$ 2,260	$ 1	$ 1,717	$ 846	$ (304)
Balance, Shares at Dec. 31, 2020		55,200,000
Stock-based compensation, net of tax	(1)		(1)
Stock-based compensation, net of tax, shares		100,000
Net earnings (loss)	(29)			(29)
Net derivative gains on cash flow hedges:
Net gains arising during the period, net of tax of $(5) (2021 – $(3))	9				9
Less: Reclassification adjustment for gains included in net earnings (loss), net of tax of nil (2021 – $(1))	(2)				(2)
Foreign currency translation adjustments	72				72
Change in unrecognized gains (losses) and prior service cost related to pension and post-retirement benefit plans, net of tax	5				5
Stock repurchase	(223)		(223)
Stock repurchase, shares		(5,100,000)
Balance at Mar. 31, 2021	2,091	$ 1	1,493	817	(220)
Balance, Shares at Mar. 31, 2021		50,200,000
Balance at Dec. 31, 2021	1,539		1,555	(40)	24
Net earnings (loss)	23			23
Net derivative gains on cash flow hedges:
Net gains arising during the period, net of tax of $(5) (2021 – $(3))	17				17
Less: Reclassification adjustment for gains included in net earnings (loss), net of tax of nil (2021 – $(1))	(2)				(2)
Foreign currency translation adjustments	13				13
Balance at Mar. 31, 2022	$ 1,590		$ 1,555	$ (17)	$ 52