Represents the interest rate applicable for loans given to affiliates of the entity.

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Lease expense recognized resulting from transactions (excluding transactions that are eliminated in consolidation or combined financial statements.

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- Definition

Represents the purchase of natural gas made by wholly owned subsidiaries of the entity.

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Represents the sale of natural gas purchases made by wholly owned subsidiaries of the entity.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle).

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Midstream refers to those gas industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). It may be applied to the gathering, processing, transmission and storage of natural gas; including the treating of natural gas to remove impurities, along with the sale of by-products such as residue gas, natural gas liquids and condensate.

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Revenue from storage facilities, such as a LNG ( Liquefied Natural Gas) storage facility.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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RELATED PARTY TRANSACTIONS (Details) CAD in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD
RELATED PARTY TRANSACTIONS
Amounts charged to the Company for transportation services	CAD 417		CAD 357	CAD 332
Lease arrangement expenses	304		287	151
Purchase of natural gas by wholly owned subsidiaries	142		98	228
Sale of natural gas by wholly owned subsidiaries	CAD 60		49	5
Minimum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	4.00%	4.00%
Maximum
RELATED PARTY TRANSACTIONS
Annual interest rate on the loans (as a percent)	12.00%	12.00%
Cost Recoveries
RELATED PARTY TRANSACTIONS
Revenue from related parties	CAD 88	$ 68
Vector Pipeline joint venture
RELATED PARTY TRANSACTIONS
Revenue from related parties	14		7	CAD 7
Amounts receivable from affiliates	109		130
DCP Midstream, LLC
RELATED PARTY TRANSACTIONS
Natural gas midstream revenue	47	36
Natural gas storage revenue	4	3
Spectra Energy Corp \| Reimbursed Maintenance Expenses
RELATED PARTY TRANSACTIONS
Revenue from related parties	10	$ 8
Other affiliates
RELATED PARTY TRANSACTIONS
Amounts receivable from affiliates	CAD 167		CAD 140