Document and Entity Information	9 Months Ended
	Sep. 30, 2016 shares
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	SE
Entity Registrant Name	SPECTRA ENERGY CORP.
Entity Central Index Key	0001373835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	701,483,324