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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Restrictions on Non-Recourse Debt and Security (Details) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]
Restricted cash (Note 21)	CAD 30	CAD 0
Borrowings	3,707	4,361
Property, plant, and equipment (Note 16)	6,578	6,824	CAD 7,173
Cash on deposit, non-recourse bonds	1
Non-recourse debt
Disclosure of detailed information about borrowings [line items]
Other borrowings	1,022	845
Restricted cash (Note 21)	35	24
Renewable generation facilities
Disclosure of detailed information about borrowings [line items]
Property, plant, and equipment (Note 16)	CAD 1,107	CAD 956

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

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- Definition

The amount of borrowings that the entity does not separately disclose in the same statement or note. [Refer: Borrowings]

+ References

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The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

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The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

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