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SHARE CAPITAL - COMMON SHARES (Details) - CAD CAD / shares in Units, shares in Millions, CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share Capital |  |  |
Common shares par value (in Canadian dollars per share) | CAD 0 |  |
Common Shares |  |  |
Balance at beginning of period, Number of Shares | 868 |  |
Balance at end of period, Number of Shares | 943 | 868 |
Gross proceeds | CAD 2,260 | CAD 57 | CAD 478
Common shares |  |  |
Common Shares |  |  |
Balance at beginning of period, Number of Shares | 868 | 852 | 831
Balance at beginning of period, Amount | CAD 7,391 | CAD 6,669 | CAD 5,744
Common shares issued, Number of Shares | 56 |  | 9
Common shares issued, Amount | CAD 2,241 |  | CAD 446
Dividend Reinvestment and Share Purchase Plan, Number of Shares | 16 | 12 | 9
Dividend Reinvestment and Share Purchase Plan, Amount | CAD 795 | CAD 646 | CAD 428
Shares issued on exercise of stock options, Number of Shares | 3 | 4 | 3
Shares issued on exercise of stock options, Amount | CAD 65 | CAD 76 | CAD 51
Balance at end of period, Number of Shares | 943 | 868 | 852
Balance at end of period, Amount | CAD 10,492 | CAD 7,391 | CAD 6,669
Gross proceeds | 2,300 | 0 | 460
Issuance costs | CAD 59 | CAD 0 | CAD 14

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