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SHARE CAPITAL - COMMON AND PREFERRED SHARES (Details) CAD / shares in Units, shares in Millions, CAD in Millions | 12 Months Ended |
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Dec. 31, 2015 $ / shares | Dec. 31, 2015 CAD item CAD / shares shares | Dec. 31, 2014 CAD shares | Dec. 31, 2013 CAD shares | Dec. 31, 2015 CAD CAD / shares shares
Common shares par value (in Canadian dollars per share) | CAD / shares |  |  |  |  | CAD 0
Shares |  |  |  |  |
Common Stock, Shares, Outstanding, Beginning Balance | shares |  | 852 |  |  |
Common Stock, Shares, Outstanding, Ending Balance | shares |  | 868 | 852 |  |
Gross proceeds |  | CAD 57 | CAD 478 | CAD 628 |
Preference shares |  |  |  |  |
Shares |  |  |  |  |
Shares issued |  |  | 1,374 | 1,434 |
Issuance costs |  | 137 | 137 | 111 |
SHARES |  |  |  |  |
Issuance costs |  | CAD (137) | (137) | (111) |
Balance at end of period, Amount |  |  | CAD 6,515 | CAD 5,141 | CAD 6,515
Characteristics of the preference shares |  |  |  |  |
Stock split conversion ratio |  | 1 |  |  |
Number of recurring anniversary after the redemption option date on which the entity may redeem preferred shares | item |  | 5 |  |  |
Number of recurring anniversary after the conversion option date on which the entity may convert preferred shares | item |  | 5 |  |  |
Quarterly floating rate cumulative dividends per share calculation, base multiplier (in dollars per share) | (per share) | $ 25 | CAD 25 |  |  |
Quarterly floating rate cumulative dividends per share calculation, period of calendar year |  | 365 days |  |  |
Quarterly floating rate cumulative dividends per share calculation, maturity period of Government of Canada treasury bill |  | 90 days |  |  |
Quarterly floating rate cumulative dividends per share calculation, maturity period of Government of US treasury bill |  | 3 months |  |  |
Preference shares | Preference Shares, Series A |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 5 | 5 | 5
Balance at end of period, Amount |  |  | CAD 125 | CAD 125 | CAD 125
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 5.50% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.375 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series B |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 20 | 20 | 20
Balance at end of period, Amount |  |  | CAD 500 | CAD 500 | CAD 500
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series C |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.40% |  |  |
Preference shares | Preference Shares, Series D |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 18 | 18 | 18
Balance at end of period, Amount |  |  | CAD 450 | CAD 450 | CAD 450
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series E |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.40% |  |  |
Preference shares | Preference Shares, Series F |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 20 | 20 | 20
Balance at end of period, Amount |  |  | CAD 500 | CAD 500 | CAD 500
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series G |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.50% |  |  |
Preference shares | Preference Shares, Series H |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 14 | 14 | 14
Balance at end of period, Amount |  |  | CAD 350 | CAD 350 | CAD 350
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series I |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.10% |  |  |
Preference shares | Preference Shares, Series J |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 8 | 8 | 8
Balance at end of period, Amount |  |  | CAD 199 | CAD 199 | CAD 199
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | $ / shares | 1.000 |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ / shares | 25 |  |  |  |
Preference shares | Preference Shares, Series K |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of US treasury bill rate (as a percent) |  | 3.10% |  |  |
Preference shares | Preference Shares, Series L |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 16 | 16 | 16
Balance at end of period, Amount |  |  | CAD 411 | CAD 411 | CAD 411
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | $ / shares | 1.000 |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ / shares | 25 |  |  |  |
Preference shares | Preference Shares, Series M |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of US treasury bill rate (as a percent) |  | 3.20% |  |  |
Preference shares | Preference Shares, Series N |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 18 | 18 | 18
Balance at end of period, Amount |  |  | CAD 450 | CAD 450 | CAD 450
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series O |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.70% |  |  |
Preference shares | Preference Shares, Series P |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 16 | 16 | 16
Balance at end of period, Amount |  |  | CAD 400 | CAD 400 | CAD 400
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series Q |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.50% |  |  |
Preference shares | Preference Shares, Series R |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 16 | 16 | 16
Balance at end of period, Amount |  |  | CAD 400 | CAD 400 | CAD 400
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series S |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.50% |  |  |
Preference shares | Preference Shares, Series 1 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 16 | 16 | 16
Balance at end of period, Amount |  |  | CAD 411 | CAD 411 | CAD 411
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | $ / shares | 1.000 |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ / shares | 25 |  |  |  |
Preference shares | Preference Shares, Series 2 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of US treasury bill rate (as a percent) |  | 3.10% |  |  |
Preference shares | Preference Shares, Series 3 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 24 | 24 | 24
Balance at end of period, Amount |  |  | CAD 600 | CAD 600 | CAD 600
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.00% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.000 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 4 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.40% |  |  |
Preference shares | Preference Shares, Series 5 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 8 | 8 | 8
Balance at end of period, Amount |  |  | CAD 206 | CAD 206 | CAD 206
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | $ / shares | 1.100 |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ / shares | $ 25 |  |  |  |
Preference shares | Preference Shares, Series 6 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of US treasury bill rate (as a percent) |  | 2.80% |  |  |
Preference shares | Preference Shares, Series 7 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 10 | 10 | 10
Balance at end of period, Amount |  |  | CAD 250 | CAD 250 | CAD 250
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.100 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 8 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.60% |  |  |
Preference shares | Preference Shares, Series 9 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 11 |  | 11
Balance at end of period, Amount |  |  | CAD 275 |  | CAD 275
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.100 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 10 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.70% |  |  |
Preference shares | Preference Shares, Series 11 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 20 |  | 20
Balance at end of period, Amount |  |  | CAD 500 |  | CAD 500
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.100 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 12 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.60% |  |  |
Preference shares | Preference Shares, Series 13 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 14 |  | 14
Balance at end of period, Amount |  |  | CAD 350 |  | CAD 350
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.100 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 14 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.70% |  |  |
Preference shares | Preference Shares, Series 15 |  |  |  |  |
SHARES |  |  |  |  |
Balance at end of period, Number of shares | shares |  |  | 11 |  | 11
Balance at end of period, Amount |  |  | CAD 275 |  | CAD 275
Characteristics of the preference shares |  |  |  |  |
Initial Yield (as a percent) |  | 4.40% |  |  |
Yearly dividend per share (in dollars per share) | CAD / shares |  | CAD 1.100 |  |  |
Per Share Base Redemption Value (in dollars per shares) | CAD / shares |  |  |  |  | CAD 25
Preference shares | Preference Shares, Series 16 |  |  |  |  |
Characteristics of the preference shares |  |  |  |  |
Quarterly floating rate cumulative dividends per share calculation, spread on Government of Canada treasury bill rate (as a percent) |  | 2.70% |  |  |
Common shares |  |  |  |  |
Shares |  |  |  |  |
Common Stock, Shares, Outstanding, Beginning Balance | shares |  | 852 | 831 | 805 |
Balance at beginning of year, Amount |  | CAD 6,669 | CAD 5,744 | CAD 4,732 |
Shares issued, Number of Shares | shares |  |  | 9 | 13 |
Shares issued |  |  | CAD 446 | CAD 582 |
Dividend Reinvestment and Share Purchase Plan (DRIP), Number of Shares | shares |  | 12 | 9 | 8 |
Dividend Reinvestment and Share Purchase Plan (DRIP), Amount |  | CAD 646 | CAD 428 | CAD 361 |
Shares issued on exercise of stock options, Number of Shares | shares |  | 4 | 3 | 5 |
Shares issued on exercise of stock options, Amount |  | CAD 76 | CAD 51 | CAD 69 |
Common Stock, Shares, Outstanding, Ending Balance | shares |  | 868 | 852 | 831 |
Balance at end of year, Amount |  | CAD 7,391 | CAD 6,669 | CAD 5,744 |
Issuance costs |  | 0 | 14 | 18 |
Gross proceeds |  | 0 | 460 | 600 |
SHARES |  |  |  |  |
Issuance costs |  | CAD 0 | CAD (14) | CAD (18) |

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