Pension and Other Postretirement Benefits, Weighted Average Asset Allocations by Asset Category (Details) - Pension and Postemployment Retirement Benefit Plans [Member]	Dec. 31, 2018	Dec. 31, 2017
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	100.00%	100.00%
U.S. [Member] | Total Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	57.00%	58.00%
U.S. [Member] | Total Equities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	45.00%
U.S. [Member] | Total Equities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	75.00%
U.S. [Member] | Domestic Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	47.00%	47.00%
U.S. [Member] | Domestic Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	30.00%
U.S. [Member] | Domestic Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	60.00%
U.S. [Member] | International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	10.00%	11.00%
U.S. [Member] | International Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	10.00%
U.S. [Member] | International Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	20.00%
U.S. [Member] | Total Fixed Income Securities and Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)
Weighted-average asset allocations
U.S. [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	30.00%	28.00%
U.S. [Member] | Fixed Income Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	20.00%
U.S. [Member] | Fixed Income Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	40.00%
U.S. [Member] | Other, Primarily Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	6.00%	7.00%
U.S. [Member] | Other, Primarily Cash and Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	0.00%
U.S. [Member] | Other, Primarily Cash and Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	15.00%
U.S. [Member] | Real Estate Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	7.00%	7.00%
U.S. [Member] | Real Estate Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	0.00%
U.S. [Member] | Real Estate Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	15.00%
Canada [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	100.00%	100.00%
Canada [Member] | Total Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	65.00%	62.00%
Canada [Member] | Total Equities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	40.00%
Canada [Member] | Total Equities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	80.00%
Canada [Member] | Domestic Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	13.00%	15.00%
Canada [Member] | International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	52.00%	47.00%
Canada [Member] | Total Fixed Income Securities and Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	35.00%	38.00%
Canada [Member] | Total Fixed Income Securities and Cash and Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	20.00%
Canada [Member] | Total Fixed Income Securities and Cash and Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average asset allocations (percent)	60.00%
Canada [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	28.00%	25.00%
Canada [Member] | Other, Primarily Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	7.00%	13.00%
Canada [Member] | Real Estate Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.00%	0.00%