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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) $ in Millions | Total | Preference shares | Common shares | Additional paid-in capital | Retained earnings/(deficit) | Accumulated other comprehensive income/(loss) | Reciprocal shareholding | Total Enbridge Inc. shareholders' equity | Noncontrolling Interest | Merger Transaction Common shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 |  | $ 6,515 | $ 7,391 | $ 3,301 | $ 142 | $ 1,632 | $ (83) |  | $ 1,300 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Shares issued |  | 740 | 2,241 |  |  |  |  |  |  |
Common shares issued in Merger Transaction (Note 8) |  |  |  |  |  |  |  |  |  | $ 0
Dividend Reinvestment and Share Purchase Plan |  |  | 795 |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 41 |  |  |  |  |  |
Exercised of stock options |  |  | 65 | (24) |  |  |  |  |  |
Dilution gain/(loss) and other |  |  |  | 81 |  |  |  |  |  |
Earnings attributable to controlling interests | $ 2,069 |  |  |  | 2,069 |  |  |  |  |
Preference share dividends |  |  |  |  | (293) |  |  |  |  |
Common share dividends declared |  |  |  |  | (1,945) |  |  |  |  |
Dividends paid to reciprocal shareholder |  |  |  |  | 26 |  |  |  |  |
Redemption value adjustment attributable to redeemable noncontrolling interests (Note 20) | 686 |  |  |  | (686) |  |  |  |  |
Adjustment relating to equity method investment |  |  |  |  | (29) |  |  |  |  |
Other comprehensive income/(loss) attributable to common shareholders, net of tax |  |  |  |  |  | (574) |  |  |  |
Change in reciprocal interest |  |  |  |  |  |  | (19) |  |  |
Earnings/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (28) |
Change in unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  | 4 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (44) |
Reclassification to earnings of (gain)/loss on cash flow hedges |  |  |  |  |  |  |  |  | 40 |
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax |  |  |  |  |  |  |  |  | 0 |
Comprehensive income/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (28) |
Distributions |  |  |  |  |  |  |  |  | (720) |
Contributions |  |  |  |  |  |  |  |  | 28 |
Purchase of noncontrolling interests on Sponsored Vehicles buy-in (Note 20) | 0 |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | (3) |
Balance at Dec. 31, 2016 | $ 21,963 | 7,255 | 10,492 | 3,399 | (716) | 1,058 | (102) | $ 21,386 | 577 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Dividends paid per common share | $ 2.12 |  |  |  |  |  |  |  |  |
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers (Note 3) | $ 0 |  |  |  | 0 |  |  |  |  |
Shares issued |  | 492 | 1,500 |  |  |  |  |  |  |
Common shares issued in Merger Transaction (Note 8) |  |  |  |  |  |  |  |  |  | 37,429
Dividend Reinvestment and Share Purchase Plan |  |  | 1,226 |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 82 |  |  |  |  |  |
Exercised of stock options |  |  | 90 | (95) |  |  |  |  |  |
Dilution gain/(loss) and other |  |  |  | (192) |  |  |  |  |  |
Earnings attributable to controlling interests | 2,859 |  |  |  | 2,859 |  |  |  |  |
Preference share dividends |  |  |  |  | (330) |  |  |  |  |
Common share dividends declared |  |  |  |  | (4,702) |  |  |  |  |
Dividends paid to reciprocal shareholder |  |  |  |  | 30 |  |  |  |  |
Redemption value adjustment attributable to redeemable noncontrolling interests (Note 20) | (292) |  |  |  | 292 |  |  |  |  |
Other |  |  |  |  | 99 |  |  |  |  |
Other comprehensive income/(loss) attributable to common shareholders, net of tax |  |  |  |  |  | (2,031) |  |  |  |
Earnings/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 232 |
Change in unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  | 15 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (431) |
Reclassification to earnings of (gain)/loss on cash flow hedges |  |  |  |  |  |  |  |  | 139 |
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax |  |  |  |  |  |  |  |  | (277) |
Comprehensive income/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (45) |
Noncontrolling interests resulting from Merger Transaction (Note 8) |  |  |  |  |  |  |  |  | 8,955 |
Enbridge Energy Company, Inc. common control transaction |  |  |  |  |  |  |  |  | (343) |
Distributions |  |  |  |  |  |  |  |  | (839) |
Contributions |  |  |  |  |  |  |  |  | 832 |
Deconsolidation of Sabal Trail Transmission, LLC |  |  |  |  |  |  |  |  | (2,318) |
Purchase of noncontrolling interests on Sponsored Vehicles buy-in (Note 20) | 0 |  |  |  |  |  |  |  |  |
Dilution gain |  |  |  |  |  |  |  |  | 832 |
Other |  |  |  |  |  |  |  |  | (54) |
Balance at Dec. 31, 2017 | $ 65,732 | 7,747 | 50,737 | 3,194 | (2,468) | (973) | (102) | 58,135 | 7,597 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Dividends paid per common share | $ 2.41 |  |  |  |  |  |  |  |  |
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers (Note 3) | $ 0 |  |  |  | 0 |  |  |  |  |
Shares issued |  |  | 0 |  |  |  |  |  |  |
Common shares issued in Merger Transaction (Note 8) |  |  | 12,727 |  |  |  |  |  |  | $ 0
Dividend Reinvestment and Share Purchase Plan |  |  | 1,181 |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 49 |  |  |  |  |  |
Sponsored Vehicles buy-in (Note 20) |  |  |  | (4,323) |  |  |  |  | (210) |
Exercised of stock options |  |  | 32 | (24) |  |  |  |  |  |
Dilution gain on Spectra Energy Partners, LP restructuring (Note 20) |  |  |  | 1,136 |  |  |  |  |  |
Dilution gain/(loss) and other |  |  |  | (111) |  |  |  |  |  |
Sale of noncontrolling interest in subsidiaries |  |  |  | $ 79 |  |  |  |  | 1,183 |
Earnings attributable to controlling interests | 2,882 |  |  |  | 2,882 |  |  |  |  |
Preference share dividends |  |  |  |  | (367) |  |  |  |  |
Common share dividends declared |  |  |  |  | (5,019) |  |  |  |  |
Dividends paid to reciprocal shareholder |  |  |  |  | 33 |  |  |  |  |
Redemption value adjustment attributable to redeemable noncontrolling interests (Note 20) | 456 |  |  |  | (456) |  |  |  | (210) |
Other |  |  |  |  | (57) |  |  |  |  |
Impact of Sponsored Vehicles buy-in |  |  |  |  |  | (142) |  |  |  |
Other comprehensive income/(loss) attributable to common shareholders, net of tax |  |  |  |  |  | 3,787 |  |  |  |
Change in reciprocal interest |  |  |  |  |  |  | 14 |  |  |
Earnings/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 334 |
Change in unrealized gain on cash flow hedges |  |  |  |  |  |  |  |  | 31 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | 294 |
Reclassification to earnings of (gain)/loss on cash flow hedges |  |  |  |  |  |  |  |  | 4 |
Other comprehensive income/(loss) attributable to noncontrolling interests, net of tax |  |  |  |  |  |  |  |  | 329 |
Comprehensive income/(loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 663 |
Distributions |  |  |  |  |  |  |  |  | (857) |
Contributions |  |  |  |  |  |  |  |  | 24 |
Spectra Energy Partners, LP restructuring (Note 20) |  |  |  |  |  |  |  |  | (1,486) |
Purchase of noncontrolling interests on Sponsored Vehicles buy-in (Note 20) | (4,469) |  |  |  |  |  |  |  | (2,657) |
Other |  |  |  |  |  |  |  |  | (82) |
Balance at Dec. 31, 2018 | $ 73,435 | $ 7,747 | $ 64,677 |  | (5,538) | $ 2,672 | $ (88) | $ 69,470 | $ 3,965 |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Dividends paid per common share | $ 2.68 |  |  |  |  |  |  |  |  |
Modified retrospective adoption of ASC 606 Revenue from Contracts with Customers (Note 3) | $ (38) |  |  |  | $ (86) |  |  |  |  |

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