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SHARE CAPITAL (Details) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 CAD | Dec. 31, 2011 CAD | Dec. 31, 2010 CAD | Dec. 31, 2012 COMMON SHARES CAD | Dec. 31, 2011 COMMON SHARES CAD | Dec. 31, 2010 COMMON SHARES CAD | Dec. 31, 2012 Preference shares (Note 19) USD ($) item | Dec. 31, 2012 Preference shares (Note 19) CAD | Dec. 31, 2011 Preference shares (Note 19) CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series A CAD | Dec. 31, 2010 Preference shares (Note 19) Preference Shares, Series A CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series B CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series C | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series D CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series E | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series F CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series G | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series H CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series I | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series J USD ($) | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series J CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series K | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series L USD ($) | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series L CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series M | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series N CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series O | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series P CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series Q | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series R CAD | Dec. 31, 2012 Preference shares (Note 19) Preference Shares, Series S
SHARES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year, Number of Shares | 781,000,000 |  |  | 781,000,000 | 770,000,000 | 756,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year, Amount |  |  |  | 3,969 | 3,683 | 3,379 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, Number of Shares |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, Amount |  |  |  | 388 |  |  |  | 2,651 | 931 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of stock options, Number of Shares |  |  |  | 6,000,000 | 4,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercise of stock options, Amount |  |  |  | 78 | 57 | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Share Purchase Plan (DRIP), Number of Shares |  |  |  | 8,000,000 | 7,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Share Purchase Plan (DRIP), Amount |  |  |  | 297 | 229 | 224 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of year, Number of Shares | 805,000,000 | 781,000,000 |  | 805,000,000 | 781,000,000 | 770,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at end of year, Amount |  |  |  | 4,732 | 3,969 | 3,683 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance Costs |  |  |  | 12 |  |  |  | 78 | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | 465 | 46 | 66 | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SHARES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year, Number of Shares |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 | 20,000,000 |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year, Amount |  |  |  |  |  |  |  | 1,056 | 125 | 125 | 125 | 500 |  | 450 |  |  |  |  |  |  | 199 |  |  | 411 |  |  |  |  |  |  |
Balance at end of year, Number of Shares |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 | 20,000,000 |  | 18,000,000 |  | 20,000,000 |  | 14,000,000 |  | 8,000,000 |  |  | 16,000,000 |  |  | 18,000,000 |  | 16,000,000 |  | 16,000,000 |
Balance at end of year, Amount |  |  |  |  |  |  |  | 3,707 | 1,056 | 125 | 125 | 500 |  | 450 |  | 500 |  | 350 |  |  | 199 |  |  | 411 |  | 450 |  | 400 |  | 400 |
Issuance costs |  |  |  | 12 |  |  |  | 78 | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, Number of Shares |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Yield (as a percent) |  |  |  |  |  |  |  |  |  | 5.50% |  | 4.00% |  | 4.00% |  | 4.00% |  | 4.00% |  | 4.00% |  |  | 4.00% |  |  | 4.00% |  | 4.00% |  | 4.00% |
Yearly dividend per share (in dollars per share) |  |  |  |  |  |  |  |  |  | 1.375 |  | 1.000 |  | 1.000 |  | 1.000 |  | 1.000 |  | $ 1.000 |  |  | $ 1.000 |  |  | 1.000 |  | 1.000 |  | 1.000 |
Per Share Base Redemption Value (in dollars per shares) |  |  |  |  |  |  |  |  |  | 25 |  | 25 |  | 25 |  | 25 |  | 25 |  | $ 25 |  |  | $ 25 |  |  | 25 |  | 25 |  | 25 |
Number of recurring anniversary after the redemption option date on which the entity may redeem preferred shares |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of recurring anniversary after the conversion option date on which the entity may convert preferred shares |  |  |  |  |  |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, base multiplier (in dollars per share) |  |  |  |  |  |  | $ 25 | 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, period of calender year |  |  |  |  |  |  | 365 days | 365 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, maturity period of Government of Canada treasury bill |  |  |  |  |  |  | 90 days | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, maturity period of Government of of US treasury bill |  |  |  |  |  |  | 90 days | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.40% |  | 2.40% |  | 2.50% |  | 2.10% |  |  |  |  |  |  |  | 2.70% |  | 2.50% |  | 2.50%
Quarterly floating rate cumulative dividends per share calculation, spread on Government of US treasury bill rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10% |  |  | 3.20% |  |  |  |  |  |
Cash dividend in initial quarter (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.2356 |
Cash dividend in regular quarters (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25 |

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