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ACQUISITIONS AND DISPOSITIONS - Summary of Estimated Fair Values Assigned to Net Assets (Details) shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2017 CAD ($) shares | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Feb. 27, 2017 $ / shares
Fair value of net assets acquired: |  |  |  |  |  |
Goodwill (Note 16) |  | $ 34,457 | $ 34,459 | $ 34,457 |  |
Purchase price: |  |  |  |  |  |
Cash |  |  | 0 | 0 | $ 644 |
Fair value adjustment to long-term debt related to rate-regulated entities |  | 1,114 | 964 | 1,114 |  |
Decrease to deferred amounts and other assets |  |  | $ 226 | $ (138) | $ (183) |
Spectra Energy |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |
Current assets | $ 2,432 |  |  |  |  |
Property, plant and equipment, net | 33,555 |  |  |  |  |
Restricted long-term investments | 144 |  |  |  |  |
Long-term investments | 5,000 |  |  |  |  |
Deferred amounts and other assets | 2,390 |  |  |  |  |
Intangible assets, net | 1,288 |  |  |  |  |
Current liabilities (a) | (3,982) |  |  |  |  |
Long-term debt | (21,444) |  |  |  |  |
Other long-term liabilities | (1,983) |  |  |  |  |
Deferred income taxes | (7,670) |  |  |  |  |
Noncontrolling interests | (8,877) |  |  |  |  |
Fair value of net assets acquired | 853 |  |  |  |  |
Goodwill (Note 16) | 36,656 |  |  |  |  |
Fair value of net assets acquired and goodwill | 37,509 |  |  |  |  |
Purchase price: |  |  |  |  |  |
Cash | 3 |  |  |  |  |
Purchase price | 37,509 |  |  |  |  |
Net carrying value of accounts receivable | 1,174 |  |  |  |  |
Gross amount due | 1,190 |  |  |  |  |
Not expected to be collected | 16 |  |  |  |  |
Business Combination, adjustment, current assets |  | 67 |  |  |  |
Business Combination, adjustment, current liabilities |  | 548 |  |  |  |
Business Combination, adjustment, long-term debt |  | $ 481 |  |  |  |
Reclassification from intangible assets to property, plant and equipment | 830 |  |  |  |  |
Increase in the book value of debt | 1,500 |  |  |  |  |
Fair value adjustment to long-term debt related to rate-regulated entities | 629 |  |  |  |  |
Spectra Energy | Common shares |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Equity issued | 37,429 |  |  |  |  |
Spectra Energy | Earned stock compensation awards |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Equity issued | $ 77 |  |  |  |  |
Spectra Energy | Spectra Energy Partners, LP |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
SEP common units outstanding to the public (in shares) | shares | 78.4 |  |  |  |  |
Closing price per common unit (in USD per share) | $ / shares |  |  |  |  |  | $ 44.88
Spectra Energy | Various equity investments of acquiree |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Long-term investments (as a percent) | 50.00% |  |  |  |  |
Spectra Energy | PennEast |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Long-term investments (as a percent) | 20.00% |  |  |  |  |
Sabal Trail |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Increase to noncontrolling interests | $ 85 |  |  |  |  |
BC Pipelines & Field Services |  |  |  |  |  |
Purchase price: |  |  |  |  |  |
Decrease to property, plant and equipment | 1,955 |  |  |  |  |
Decrease to deferred income tax liabilities | 661 |  |  |  |  |
Decrease to deferred amounts and other assets | 530 |  |  |  |  |
Increase to noncontrolling interests | $ 1,824 |  |  |  |  |

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