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Noncontrolling Interest, Restructuring

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The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.

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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.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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

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NONCONTROLLING INTERESTS - REDEEMABLE NONCONTROLLING INFORMATION (Details) - CAD ($) shares in Millions, $ in Millions		9 Months Ended
	Jan. 22, 2018	Sep. 30, 2018	Sep. 30, 2017	Aug. 01, 2018	Dec. 31, 2017
Noncontrolling interests
Noncontrolling Interest [Line Items]
Sale of noncontrolling interests in subsidiaries (Note 10)		$ (1,183)	$ 0
Spectra Energy Partners, LP restructuring (Note 9)		1,486	0
Additional paid-in capital
Noncontrolling Interest [Line Items]
Sale of noncontrolling interests in subsidiaries (Note 10)		79	0
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10)		1,136	$ 0
Deferred Income Tax Liability
Noncontrolling Interest [Line Items]
Sale of noncontrolling interests in subsidiaries (Note 10)		27
Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Stock issued during period, shares, conversion of units (in shares)	172.5
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Variable interest ntity, ownership, shares (in shares)	403.0
Ownership interest in VIE (as a percent)	83.00%
Other Restructuring \| Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Deferred tax liabilities, net		$ 333
Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent					75.00%
Incentive Distribution Rights \| Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent					100.00%
Discontinued Operations, Disposed of by Sale \| Canadian Renewable Assets
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent				49.00%
Discontinued Operations, Disposed of by Sale \| United States Renewable Assets
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent				49.00%