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Employee Benefit Plans (Asset Class) (Details) - Pension Plan [Member]
Dec. 31, 2018
Short-term securities | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.05%
Short-term securities | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.00%
Fixed Income Funds [Member] | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.50%
Fixed Income Funds [Member] | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.35%
Fixed Income Funds [Member] | Foreign Pension Plan [Member] | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.53%
Fixed Income Funds [Member] | Foreign Pension Plan [Member] | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.48%
Equity Securities, Canadian [Member] | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.22%
Equity Securities, Canadian [Member] | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.12%
Equity Securities, Non Canadian [Member] | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.55%
Equity Securities, Non Canadian [Member] | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.30%
Equity Securities, Non Canadian [Member] | Foreign Pension Plan [Member] | Maximum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.52%
Equity Securities, Non Canadian [Member] | Foreign Pension Plan [Member] | Minimum [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations 0.47%