VARIABLE INTEREST ENTITIES - NARRATIVE (Details) - Sabal Trail Transmission L L C - USD ($)	6 Months Ended
Jun. 30, 2018	Apr. 30, 2018
Variable Interest Entity, Not Primary Beneficiary
Ownership interest in VIE (as a percent)	50.00%
Spectra Energy Partners, LP
Variable Interest Entity, Not Primary Beneficiary
Proceeds from issuance of debt	$ 744,000,000
4.246% Senior Notes Due In 2028 \| Spectra Energy Partners, LP
Variable Interest Entity, Not Primary Beneficiary
Face amount of notes issued		$ 500,000,000
Interest rate (as a percent)		4.246%
4.682% Senior Notes Due in 2038 \| Spectra Energy Partners, LP
Variable Interest Entity, Not Primary Beneficiary
Face amount of notes issued		$ 600,000,000
Interest rate (as a percent)		4.682%
4.832% Senior Notes Due In 2048 \| Spectra Energy Partners, LP
Variable Interest Entity, Not Primary Beneficiary
Face amount of notes issued		$ 400,000,000
Interest rate (as a percent)		4.832%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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Balance Type:	debit
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- References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

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- Details

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- Details

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- Details

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- Details

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