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SHARE CAPITAL - COMMON SHARES (Details) - CAD ($) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 08, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Common Shares |  |  |  |
Balance at beginning of period (in shares) |  | 2,022 |  |
Balance at end of period (in shares) |  | 2,025 | 2,022 |
Common Shares |  |  |  |
Common Shares |  |  |  |
Balance at beginning of period (in shares) |  | 2,022 | 1,695 | 943
Balance at beginning of period, Amount |  | $ 64,677 | $ 50,737 | $ 10,492
Common shares issued (in shares) |  | 0 | 0 | 33
Common shares issued, Amount |  | $ 0 | $ 0 | $ 1,500
Common shares issued in acquisition, amount |  | $ 0 | $ 12,727 | $ 0
Dividend Reinvestment and Share Purchase Plan (in shares) |  | 0 | 28 | 25
Dividend Reinvestment and Share Purchase Plan |  | $ 0 | $ 1,181 | $ 1,226
Shares issued on exercise of stock options (in shares) |  | 3 | 2 | 3
Shares issued on exercise of stock options, Amount |  | $ 69 | $ 32 | $ 90
Balance at end of period (in shares) |  | 2,025 | 2,022 | 1,695
Balance at end of period, Amount |  | $ 64,746 | $ 64,677 | $ 50,737
Merger Transaction | Common Shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) |  | 0 | 0 | 691
Common shares issued in acquisition, amount |  | $ 0 | $ 0 | $ 37,429
Spectra Energy Partners, LP | Common Shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) |  | 0 | 91 | 0
Common shares issued in acquisition, amount |  | $ 0 | $ 3,888 | $ 0
Enbridge Energy Partners, L.P. | Common Shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) |  | 0 | 72 | 0
Common shares issued in acquisition, amount |  | $ 0 | $ 3,042 | $ 0
Enbridge Energy Management, L.L.C. (EEM) | Common Shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) |  | 0 | 30 | 0
Common shares issued in acquisition, amount |  | $ 0 | $ 1,267 | $ 0
Enbridge Income Fund | Common Shares |  |  |  |
Common Shares |  |  |  |
Common shares issued in acquisition (in shares) |  | 0 | 104 | 0
Common shares issued in acquisition, amount | $ 4,500 | $ 0 | $ 4,530 | $ 0

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