Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss) Foreign Currency Translation Adjustments	Accumulated Other Comprehensive Income (Loss) Other	Noncontrolling Interests
Beginning Balance at Dec. 31, 2014	$ 10,398	$ 1	$ 4,956	$ 2,541	$ 1,016	$ (354)	$ 2,238
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	648			459			189
Other comprehensive income (loss)	(735)				(744)	20	(11)
Dividends on common stock	(747)			(747)
Stock-based compensation	14		14
Distributions to noncontrolling interests	(142)						(142)
Contributions from noncontrolling interests	164						164
Spectra Energy common stock issued	2		2
Spectra Energy Partners, LP common units issued	330		49				281
Other, net	(1)		3				(4)
Ending Balance at Sep. 30, 2015	9,931	1	5,024	2,253	272	(334)	2,715
Beginning Balance at Dec. 31, 2015	9,532	1	5,053	1,741	79	(348)	3,006
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	812			578			234
Other comprehensive income (loss)	287				268	14	5
Dividends on common stock	(842)			(842)
Stock-based compensation	20		20
Distributions to noncontrolling interests	(180)						(180)
Contributions from noncontrolling interests	437						437
Spectra Energy common stock issued	878		878
Spectra Energy Partners, LP common units issued	457		25				432
Other, net	18		1				17
Ending Balance at Sep. 30, 2016	$ 11,419	$ 1	$ 5,977	$ 1,477	$ 347	$ (334)	$ 3,951