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RETIREMENT AND POSTRETIREMENT BENEFITS - MEDICAL COST TRENDS (Details) - Spectra Energy Corp	Feb. 27, 2017
Canada OPEB Plan
MEDICAL COST TRENDS
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent)	5.00%
Ultimate Medical Cost Trend Rate Assumption (as a percent)	5.00%
U.S. OPEB Plan
MEDICAL COST TRENDS
Medical Cost Trend Rate Assumption for Next Fiscal Year (as a percent)	7.50%
Ultimate Medical Cost Trend Rate Assumption (as a percent)	4.50%
Year in which Ultimate Medical Cost Trend Rate Assumption is Achieved	2037

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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The ultimate trend rate for health care costs.

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
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