Pensions and Other Postretirement Benefits (Foreign Currency Risk Exposure) (Details) - Pensions [Member]	12 Months Ended
	Dec. 31, 2020
Canadian Dollar [Member]
Defined Benefit Plan Disclosure [Line Items]
Currency risk percentage exposure	60.00%
U.S. Dollar [Member]
Defined Benefit Plan Disclosure [Line Items]
Currency risk percentage exposure	23.00%
European Currencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Currency risk percentage exposure	8.00%
Japanese Yen [Member]
Defined Benefit Plan Disclosure [Line Items]
Currency risk percentage exposure	2.00%
Various Other Currencies [Member]
Defined Benefit Plan Disclosure [Line Items]
Currency risk percentage exposure	7.00%