Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1	$ 3	$ 3
Interest cost	9	12	11
Expected return on plan assets	(14)	(14)	(14)
Amortization of prior service cost	1	1	1
Amortization of net actuarial loss	6	5	6
Net periodic pension cost before settlement	2	6	7
Loss due to settlement	0	0	0
Net periodic pension cost	2	6	7
Net periodic pension cost included in cost of sales	0	2	2
Net periodic pension cost included in selling, general, and administrative expenses	1	1	1
Net periodic pension cost included in other non-operating items	$ 1	$ 3	$ 4
Defined Benefit, Canadian Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.00%	3.80%	3.30%
Expected return on plan assets	3.20%	3.40%	4.10%
Rate of compensation increase	3.50%	3.50%	3.50%
Defined Benefit, SERP [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate			4.00%
Defined Benefit, US Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.10%	4.20%	3.50%
Expected return on plan assets	5.80%	5.80%	5.80%