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SHARE CAPITAL - COMMON SHARES (Details) $ / shares in Units, shares in Millions, $ in Billions | 12 Months Ended
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Dec. 31, 2018 CAD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Share Capital |  |  |  |
Common shares par value (in dollars per share) | $ / shares | $ 0 |  |  |
Common Shares |  |  |  |
Balance at beginning of period (in shares) | shares | 1,695 | 1,695 |  |
Balance at end of period (in shares) | shares | 2,022 | 2,022 | 1,695 |
Gross proceeds | $ 21,000,000 | $ 0.0 | $ 1,549,000,000 | $ 2,260,000,000
Issuance costs | $ | $ 0 |  | $ 0 | $ 59,000,000
Common shares |  |  |  |
Common Shares |  |  |  |
Balance at beginning of period (in shares) | shares | 1,695 | 1,695 | 943 | 868
Balance at beginning of period, Amount | $ | $ 50,737,000,000 |  | $ 10,492,000,000 | $ 7,391,000,000
Common shares issued (in shares) | shares | 0 | 0 | 33 | 56
Common shares issued, Amount | $ | $ 0 |  | $ 1,500,000,000 | $ 2,241,000,000
Common shares issued in acquisition, amount | $ | $ 12,727,000,000 |  |  |
Dividend Reinvestment and Share Purchase Plan (in shares) | shares | 28 | 28 | 25 | 16
Dividend Reinvestment and Share Purchase Plan | $ | $ 1,181,000,000 |  | $ 1,226,000,000 | $ 795,000,000
Shares issued on exercise of stock options (in shares) | shares | 2 | 2 | 3 | 3
Shares issued on exercise of stock options, Amount | $ | $ 32,000,000 |  | $ 90,000,000 | $ 65,000,000
Balance at end of period (in shares) | shares | 2,022 | 2,022 | 1,695 | 943
Balance at end of period, Amount | $ | $ 64,677,000,000 |  | $ 50,737,000,000 | $ 10,492,000,000
Merger Transaction | Common shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) | shares | 0 | 0 | 691 | 0
Common shares issued in acquisition, amount | $ | $ 0 |  | $ 37,429,000,000 | $ 0
Spectra Energy Partners, LP | Common shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) | shares | 91 | 91 | 0 | 0
Common shares issued in acquisition, amount | $ | $ 3,888,000,000 |  | $ 0 | $ 0
Enbridge Energy Partners, L.P. | Common shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) | shares | 72 | 72 | 0 | 0
Common shares issued in acquisition, amount | $ | $ 3,042,000,000 |  | $ 0 | $ 0
Enbridge Energy Management, L.L.C. (EEM) | Common shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) | shares | 30 | 30 | 0 | 0
Common shares issued in acquisition, amount | $ | $ 1,267,000,000 |  | $ 0 | $ 0
Enbridge Income Fund | Common shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) | shares | 104 | 104 | 0 | 0
Common shares issued in acquisition, amount | $ | $ 4,530,000,000 |  | $ 0 | $ 0

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