Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes

No definition available.

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- Definition

The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4M
-URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591554-111686

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

The cash inflow from the issuance of common limited partners units during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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- Definition

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.

+ References

No definition available.

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

No definition available.

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- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.

+ References

No definition available.

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Issuances of SEP Units - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Proceeds from the issuances of Spectra Energy Partners, LP common units				$ 473	$ 351
Increase in additional paid-in capital resulting from issuances of SEP units				457	330
Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Proceeds from the issuances of Spectra Energy Partners, LP common units				483
Additional Paid-in Capital
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units		$ 10	$ 24	25	49
Noncontrolling Interests
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units				$ 432	$ 281
Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Percentage ownership by parent before equity issuance						78.00%
Percentage ownership by parent after equity issuance				76.00%
Spectra Energy Partners, LP \| Additional Paid-in Capital
Related Party Transaction [Line Items]
Gain in Additional Paid in Capital from SEP unit issuance				$ 40
Increase in additional paid-in capital resulting from issuances of SEP units				25
Spectra Energy Partners, LP \| Noncontrolling Interests
Related Party Transaction [Line Items]
Increase in additional paid-in capital resulting from issuances of SEP units				$ 432
SEP At-the-Market program \| Limited Partner \| Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units				10,400,000
SEP At-the-Market program \| General Partner \| Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units				212,000
Private Placement \| Spectra Energy Corp \| Limited Partner \| Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units	10,400,000
Private Placement \| Spectra Energy Corp \| General Partner \| Spectra Energy Partners, LP
Related Party Transaction [Line Items]
Spectra Energy purchase of SEP's common units	200,000