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Net Other Operating (Income) Losses Analysis of income and expenses (Details) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Analysis of income and expenses [Line Items]
Alberta Off-Coal Agreement	CAD (40)		CAD 0	CAD 0
Mississauga cogeneration facility NUG Contract	(9)	CAD (191)	0
Market Surveillance Administrator Agreement settlement	0	0	56
Insurance recoveries	0	(3)	(31)
Net other operating (income) losses	CAD (49)	CAD (194)	CAD 25

X

- Definition

The amount of income recognised from the reimbursement of a claim as a result of the occurrence of an insured event covered by an insurance contract. [Refer: Types of insurance contracts [member]]

+ References

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X

- Definition

The losses on settlements of litigation.

+ References

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- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

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- Definition

[Line Items] for Analysis of income and expenses [Table]

+ References

No definition available.

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X

- Definition

Gains (Losses) on Contract Agreement

+ References

No definition available.

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- Definition

Gains (Losses) on Contract Restructuring

+ References

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