GUARANTEES	12 Months Ended
Dec. 31, 2017
Guarantees [Abstract]
GUARANTEES	GUARANTEES In the normal course of conducting business, we enter into agreements which indemnify third parties and affiliates. Examples include indemnifying counterparties pursuant to sale agreements for assets or businesses in matters such as breaches of representations, warranties or covenants, loss or damages to property, environmental liabilities, changes in laws, valuation differences, and litigation and contingent liabilities. We may indemnify the purchaser for certain tax liabilities incurred while we owned the assets or for a misrepresentation related to taxes that result in a loss to the purchaser. Similarly, we may indemnify the purchaser of assets for certain tax liabilities related to those assets. As discussed below, these contracts include financial guarantees, stand-by letters of credit, debt guarantees, surety bonds and indemnifications. We enter into these arrangements to facilitate commercial transactions with third parties by enhancing the value of the transactions to the third parties. To varying degrees, these guarantees involve elements of performance and credit risk, which are not included on our Consolidated Statements of Financial Position. The possibility of having to perform under these guarantees and indemnifications is largely dependent upon future operations of various subsidiaries, investees and other third parties, or the occurrence of certain future events. We cannot reasonably estimate the maximum potential amounts that could become payable to third parties and affiliates under these agreements; however, historically, we have not made any significant payments under indemnification provisions. While these agreements may specify a maximum potential exposure, or a specified duration to the indemnification obligation, there are circumstances where the amount and duration are unlimited. The indemnifications and guarantees have not had, and are not reasonably likely to have, a material effect on our financial condition, changes in financial condition, earnings, liquidity, capital expenditures or capital resources. We have agreed to indemnify EEP from and against substantially all liabilities, including liabilities relating to environmental matters, arising from operations prior to the transfer of our pipeline operations to EEP in 1991. This indemnification does not apply to amounts that EEP would be able to recover in its tariff rates if not recovered through insurance or to any liabilities relating to a change in laws after December 27, 1991. We have also agreed to indemnify EEM for any tax liability related to EEM’s formation, management of EEP and ownership of i-units of EEP. We have not made any significant payment under these tax indemnifications. We do not believe there is a material exposure at this time. We have agreed to indemnify the Fund Group for certain liabilities relating to environmental matters arising from operations prior to the transfer of certain assets and interests to the Fund Group in 2012 and prior to the transfer of certain assets and interests to the Fund Group as part of the Canadian Restructuring Plan. We have also agreed to pay defined payments to the Fund Group on their investment in Southern Lights Pipeline in the event shippers do not elect to extend their current contracts post June 2025. In connection with Spectra Energy's spin-off from Duke Energy in 2007, certain guarantees that were previously issued by Spectra Energy were assigned to, or replaced by, Duke Energy as guarantor in 2006. For any remaining guarantees of other Duke Energy obligations, Duke Energy has indemnified Spectra Energy against any losses incurred under these guarantee arrangements. The maximum potential amount of future payments we could have been required to make under these performance guarantees as at December 31, 2017 was approximately US$406 million, which has been indemnified by Duke Energy as discussed above. One of these outstanding performance guarantees, which has a maximum potential future payment of US$201 million, expires in 2028. The remaining guarantees have no contractual expirations. Spectra Energy has also issued joint and several guarantees to some of the Duke/Fluor Daniel (D/FD) project owners, guaranteeing the performance of D/FD under its engineering, procurement and construction contracts and other contractual commitments in place at the time of Spectra Energy's spin-off from Duke Energy. D/FD is one of the entities transferred to Duke Energy in connection with Spectra Energy's spin-off. Substantially all of these guarantees have no contractual expiration and no stated maximum amount of future payments that we could be required to make. Fluor Enterprises Inc., as 50% owner in D/FD, issued similar joint and several guarantees to the same D/FD project owners. In connection with Spectra Energy's 50% ownership in DCP Midstream, Spectra Energy has agreed to guarantee their portion of the obligations of the joint venture under a US$424 million term loan agreement of which US$350 million is outstanding as at December 31, 2017. If DCP Midstream fails to meet its obligations under the credit agreement, Spectra Energy's maximum potential total future payments to lenders under the guarantee based on the amounts outstanding as at December 31, 2017 would be US$175 million. The guarantee will terminate upon the payment of all obligations under the credit agreement, which expires in December 2019. SEP has issued performance guarantees to a third party and an affiliate on behalf of an equity method investee. These guarantees were issued to enable the equity method investee to enter into long-term transportation contracts with the third party. While the likelihood is remote, the maximum potential amount of future payments that could be required to be made as at December 31, 2017 is US$90 million. These performance guarantees expire in 2032. Westcoast Energy Inc., a 100%-owned subsidiary, has issued performance guarantees to third parties guaranteeing the performance of unconsolidated entities, such as equity method investees, and of entities previously sold by Westcoast Energy Inc. to third parties. Those guarantees require Westcoast Energy Inc. to make payment to the guaranteed third party upon the failure of such unconsolidated or sold entity to make payment under some of its contractual obligations, such as debt agreements, purchase contracts and leases.

GUARANTEES

In the normal course of conducting business, we enter into agreements which indemnify third parties and affiliates. Examples include indemnifying counterparties pursuant to sale agreements for assets or businesses in matters such as breaches of representations, warranties or covenants, loss or damages to property, environmental liabilities, changes in laws, valuation differences, and litigation and contingent liabilities. We may indemnify the purchaser for certain tax liabilities incurred while we owned the assets or for a misrepresentation related to taxes that result in a loss to the purchaser. Similarly, we may indemnify the purchaser of assets for certain tax liabilities related to those assets.

As discussed below, these contracts include financial guarantees, stand-by letters of credit, debt guarantees, surety bonds and indemnifications. We enter into these arrangements to facilitate commercial transactions with third parties by enhancing the value of the transactions to the third parties. To varying degrees, these guarantees involve elements of performance and credit risk, which are not included on our Consolidated Statements of Financial Position. The possibility of having to perform under these guarantees and indemnifications is largely dependent upon future operations of various subsidiaries, investees and other third parties, or the occurrence of certain future events.

We cannot reasonably estimate the maximum potential amounts that could become payable to third parties and affiliates under these agreements; however, historically, we have not made any significant payments under indemnification provisions. While these agreements may specify a maximum potential exposure, or a specified duration to the indemnification obligation, there are circumstances where the amount and duration are unlimited. The indemnifications and guarantees have not had, and are not reasonably likely to have, a material effect on our financial condition, changes in financial condition, earnings, liquidity, capital expenditures or capital resources.

We have agreed to indemnify EEP from and against substantially all liabilities, including liabilities relating to environmental matters, arising from operations prior to the transfer of our pipeline operations to EEP in 1991. This indemnification does not apply to amounts that EEP would be able to recover in its tariff rates if not recovered through insurance or to any liabilities relating to a change in laws after December 27, 1991.

We have also agreed to indemnify EEM for any tax liability related to EEM’s formation, management of EEP and ownership of i-units of EEP. We have not made any significant payment under these tax indemnifications. We do not believe there is a material exposure at this time.

We have agreed to indemnify the Fund Group for certain liabilities relating to environmental matters arising from operations prior to the transfer of certain assets and interests to the Fund Group in 2012 and prior to the transfer of certain assets and interests to the Fund Group as part of the Canadian Restructuring Plan. We have also agreed to pay defined payments to the Fund Group on their investment in Southern Lights Pipeline in the event shippers do not elect to extend their current contracts post June 2025.

In connection with Spectra Energy's spin-off from Duke Energy in 2007, certain guarantees that were previously issued by Spectra Energy were assigned to, or replaced by, Duke Energy as guarantor in 2006. For any remaining guarantees of other Duke Energy obligations, Duke Energy has indemnified Spectra Energy against any losses incurred under these guarantee arrangements. The maximum potential amount of future payments we could have been required to make under these performance guarantees as at December 31, 2017 was approximately US$406 million, which has been indemnified by Duke Energy as discussed above. One of these outstanding performance guarantees, which has a maximum potential future payment of US$201 million, expires in 2028. The remaining guarantees have no contractual expirations.

Spectra Energy has also issued joint and several guarantees to some of the Duke/Fluor Daniel (D/FD) project owners, guaranteeing the performance of D/FD under its engineering, procurement and construction contracts and other contractual commitments in place at the time of Spectra Energy's spin-off from Duke Energy. D/FD is one of the entities transferred to Duke Energy in connection with Spectra Energy's spin-off. Substantially all of these guarantees have no contractual expiration and no stated maximum amount of future payments that we could be required to make. Fluor Enterprises Inc., as 50% owner in D/FD, issued similar joint and several guarantees to the same D/FD project owners.

In connection with Spectra Energy's 50% ownership in DCP Midstream, Spectra Energy has agreed to guarantee their portion of the obligations of the joint venture under a US$424 million term loan agreement of which US$350 million is outstanding as at December 31, 2017. If DCP Midstream fails to meet its obligations under the credit agreement, Spectra Energy's maximum potential total future payments to lenders under the guarantee based on the amounts outstanding as at December 31, 2017 would be US$175 million. The guarantee will terminate upon the payment of all obligations under the credit agreement, which expires in December 2019.

SEP has issued performance guarantees to a third party and an affiliate on behalf of an equity method investee. These guarantees were issued to enable the equity method investee to enter into long-term transportation contracts with the third party. While the likelihood is remote, the maximum potential amount of future payments that could be required to be made as at December 31, 2017 is US$90 million. These performance guarantees expire in 2032.

Westcoast Energy Inc., a 100%-owned subsidiary, has issued performance guarantees to third parties guaranteeing the performance of unconsolidated entities, such as equity method investees, and of entities previously sold by Westcoast Energy Inc. to third parties. Those guarantees require Westcoast Energy Inc. to make payment to the guaranteed third party upon the failure of such unconsolidated or sold entity to make payment under some of its contractual obligations, such as debt agreements, purchase contracts and leases.