Face (par) amount of debt instrument at time of issuance.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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GUARANTEES (Details) CAD in Millions	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items]
Long-term debt \| CAD	CAD 62,927
Westcoast Energy Inc.
Guarantor Obligations [Line Items]
Ownership interest (as a percent)	100.00%	100.00%
Fluor Enterprises Inc \| Duke/Fluor Daniel
Guarantor Obligations [Line Items]
Ownership interest (as a percent)	50.00%	50.00%
Spectra Energy Partners, LP \| DCP Midstream, LLC
Guarantor Obligations [Line Items]
Ownership interest (as a percent)	50.00%	50.00%
Medium-term notes \| DCP Midstream, LLC
Guarantor Obligations [Line Items]
Principal Amount		$ 424,000,000
Long-term debt		350,000,000
Performance Guarantee [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure		406,000,000
Performance Guarantee, Expiring 2028
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure		201,000,000
Term Loan Agreement \| Spectra Energy Partners, LP
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure		175,000,000
Performance Guarantee, Expiring 2032 \| Spectra Energy Partners, LP
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure		$ 90,000,000