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Employee future benefits - Composition of Plan Assets (Details)	Dec. 31, 2018	Dec. 31, 2017
Employee Benefits [Abstract]
Cash and cash equivalents	3.00%	3.00%
Equity securities	59.00%	60.00%
Debt securities	38.00%	37.00%
Total	100.00%	100.00%

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- Definition

Cash And Cash Equivalents, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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- Definition

Debt Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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- Definition

Employee Benefits [Abstract]

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- Definition

Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

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Plan Assets At Fair Value, Allocation Percentage

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