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SHARE CAPITAL - Preferred Shares (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |
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Dec. 31, 2022 CAD ($) $ / shares shares | Dec. 31, 2022 CAD ($) $ / shares $ / shares shares | Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) shares | Dec. 31, 2022 $ / shares | Jun. 01, 2022 USD ($) | Mar. 01, 2022 CAD ($)
Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, value, outstanding | $ | $ 6,818 | $ 6,818 | $ 7,747 | $ 7,747 |  |  |
Issuance costs | $ | $ (135) |  | $ (155) | $ (155) |  |  |
Preference Shares, Series A | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 5 | 5 | 5 | 5 |  |  |
Preferred stock, value, outstanding | $ | $ 125 | $ 125 | $ 125 | $ 125 |  |  |
Initial Yield (as a percent) | 5.50% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.37500 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series B | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 20 | 20 | 18 | 18 |  |  |
Preferred stock, value, outstanding | $ | $ 500 | $ 500 | $ 457 | $ 457 |  |  |
Initial Yield (as a percent) | 5.20% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.30052 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series C1 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 0 | 0 | 2 | 2 |  |  |
Preferred stock, value, outstanding | $ | $ 0 | $ 0 | $ 43 | $ 43 |  |  |
Preference Shares, Series C1 | Preferred Shares | US Treasury Rate |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Initial yield, spread on variable rate (percent) | 2.40% | 2.40% |  |  |  |  |
Preference Shares, Series D | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 18 | 18 | 18 | 18 |  |  |
Preferred stock, value, outstanding | $ | $ 450 | $ 450 | $ 450 | $ 450 |  |  |
Initial Yield (as a percent) | 4.46% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.11500 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series F | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 20 | 20 | 20 | 20 |  |  |
Preferred stock, value, outstanding | $ | $ 500 | $ 500 | $ 500 | $ 500 |  |  |
Initial Yield (as a percent) | 4.69% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.17224 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series H | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 14 | 14 | 14 | 14 |  |  |
Preferred stock, value, outstanding | $ | $ 350 | $ 350 | $ 350 | $ 350 |  |  |
Initial Yield (as a percent) | 4.38% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.09400 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Series J Preferred Stock |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, redemption amount | $ |  |  |  |  |  | $ 200 |
Series J Preferred Stock | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 0 | 0 | 8 | 8 |  |  |
Preferred stock, value, outstanding | $ | $ 0 | $ 0 | $ 199 | $ 199 |  |  |
Preference Shares, Series L | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 16 | 16 | 16 | 16 |  |  |
Preferred stock, value, outstanding | $ | $ 411 | $ 411 | $ 411 | $ 411 |  |  |
Initial Yield (as a percent) | 5.86% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) |  | $ 1.46448 |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) |  |  |  |  | $ 25 |  |
Preference Shares, Series N | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 18 | 18 | 18 | 18 |  |  |
Preferred stock, value, outstanding | $ | $ 450 | $ 450 | $ 450 | $ 450 |  |  |
Initial Yield (as a percent) | 5.09% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.27152 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series P | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 16 | 16 | 16 | 16 |  |  |
Preferred stock, value, outstanding | $ | $ 400 | $ 400 | $ 400 | $ 400 |  |  |
Initial Yield (as a percent) | 4.38% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.09476 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series R | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 16 | 16 | 16 | 16 |  |  |
Preferred stock, value, outstanding | $ | $ 400 | $ 400 | $ 400 | $ 400 |  |  |
Initial Yield (as a percent) | 4.07% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.01825 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 1 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 16 | 16 | 16 | 16 |  |  |
Preferred stock, value, outstanding | $ | $ 411 | $ 411 | $ 411 | $ 411 |  |  |
Initial Yield (as a percent) | 5.95% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) |  | $ 1.48728 |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) |  |  |  |  | 25 |  |
Preference Shares, Series 3 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 24 | 24 | 24 | 24 |  |  |
Preferred stock, value, outstanding | $ | $ 600 | $ 600 | $ 600 | $ 600 |  |  |
Initial Yield (as a percent) | 3.74% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 0.93425 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 5 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 8 | 8 | 8 | 8 |  |  |
Preferred stock, value, outstanding | $ | $ 206 | $ 206 | $ 206 | $ 206 |  |  |
Initial Yield (as a percent) | 5.38% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) |  | $ 1.34383 |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) |  |  |  |  | $ 25 |  |
Preference Shares, Series 7 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 10 | 10 | 10 | 10 |  |  |
Preferred stock, value, outstanding | $ | $ 250 | $ 250 | $ 250 | $ 250 |  |  |
Initial Yield (as a percent) | 4.45% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.11224 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 9 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 11 | 11 | 11 | 11 |  |  |
Preferred stock, value, outstanding | $ | $ 275 | $ 275 | $ 275 | $ 275 |  |  |
Initial Yield (as a percent) | 4.10% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.02424 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 11 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 20 | 20 | 20 | 20 |  |  |
Preferred stock, value, outstanding | $ | $ 500 | $ 500 | $ 500 | $ 500 |  |  |
Initial Yield (as a percent) | 3.94% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 0.98452 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 13 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 14 | 14 | 14 | 14 |  |  |
Preferred stock, value, outstanding | $ | $ 350 | $ 350 | $ 350 | $ 350 |  |  |
Initial Yield (as a percent) | 3.04% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 0.76076 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Preference Shares, Series 15 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 11 | 11 | 11 | 11 |  |  |
Preferred stock, value, outstanding | $ | $ 275 | $ 275 | $ 275 | $ 275 |  |  |
Initial Yield (as a percent) | 2.98% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 0.74576 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |
Series17 Preferred Stock |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, redemption amount | $ |  |  |  |  |  |  | $ 750
Series17 Preferred Stock | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 0 | 0 | 30 | 30 |  |  |
Preferred stock, value, outstanding | $ | $ 0 | $ 0 | $ 750 | $ 750 |  |  |
Preference Shares, Series 19 | Preferred Shares |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares | 20 | 20 | 20 | 20 |  |  |
Preferred stock, value, outstanding | $ | $ 500 | $ 500 | $ 500 | $ 500 |  |  |
Initial Yield (as a percent) | 4.90% |  |  |  |  |  |
Yearly dividend per share (in dollars per share) | $ 1.22500 |  |  |  |  |  |
Per Share Base Redemption Value (in dollars per shares) | $ 25 | $ 25 |  |  |  |  |

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