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RETIREMENT AND POSTRETIREMENT BENEFITS - ACQUIRED PLAN ASSETS (Details) - Spectra Energy Corp CAD in Millions	Feb. 27, 2017 CAD
Canada | Equity securities
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	55.00%
Canada | Fixed income securities
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	45.00%
Canada | Other
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	0.00%
United States | Equity securities
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	30.00%
United States | Fixed income securities
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	60.00%
United States | Other
Target Mix for Plan Assets
Allocation of plan assets (as a percent)	10.00%
Canada Pension Plan
Pension and Other Postretirement Benefits
Expected rate of return on plan assets (as a percent)	6.40%
Major Categories of Plan Assets
Financial instruments at fair value	CAD 1,290
U.S. Pension Plan
Pension and Other Postretirement Benefits
Expected rate of return on plan assets (as a percent)	5.50%
Major Categories of Plan Assets
Financial instruments at fair value	CAD 737
U.S. OPEB Plan
Pension and Other Postretirement Benefits
Expected rate of return on plan assets (as a percent)	4.80%
Major Categories of Plan Assets
Financial instruments at fair value	CAD 103
Pension | Equity securities
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	48.90%
Financial instruments at fair value	CAD 992
Pension | Equity securities | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	580
Pension | Equity securities | Level 2
Major Categories of Plan Assets
Financial instruments at fair value	CAD 412
Pension | Fixed income securities
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	46.70%
Financial instruments at fair value	CAD 946
Pension | Fixed income securities | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	CAD 946
Pension | Cash and cash equivalents and other
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	4.40%
Pension | Cash and cash equivalents
Major Categories of Plan Assets
Financial instruments at fair value	CAD 4
Pension | Cash and cash equivalents | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	4
Pension | Other
Major Categories of Plan Assets
Financial instruments at fair value	85
Pension | Other | Level 3
Major Categories of Plan Assets
Financial instruments at fair value	CAD 85
OPEB | Equity securities
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	38.80%
Financial instruments at fair value	CAD 40
OPEB | Equity securities | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	21
OPEB | Equity securities | Level 2
Major Categories of Plan Assets
Financial instruments at fair value	CAD 19
OPEB | Fixed income securities
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	47.60%
Financial instruments at fair value	CAD 49
OPEB | Fixed income securities | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	37
OPEB | Fixed income securities | Level 2
Major Categories of Plan Assets
Financial instruments at fair value	CAD 12
OPEB | Cash and cash equivalents and other
Major Categories of Plan Assets
Percentage of plan assets invested in readily marketable investments	13.60%
OPEB | Cash and cash equivalents
Major Categories of Plan Assets
Financial instruments at fair value	CAD 6
OPEB | Cash and cash equivalents | Level 1
Major Categories of Plan Assets
Financial instruments at fair value	6
OPEB | Other
Major Categories of Plan Assets
Financial instruments at fair value	8
OPEB | Other | Level 3
Major Categories of Plan Assets
Financial instruments at fair value	CAD 8

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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