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Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) - Net change in unrecognized pension and post-retirement benefit costs - Restatement Adjustment $ in Millions	Jan. 01, 2018 CAD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 37
AOCI, deferred taxes	15
AOCI, net of tax	$ 22

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains in other comprehensive income.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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