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EQUITY - Schedule Of Series Of Preferred Shares (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Nov. 01, 2021 | Dec. 31, 2020
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 134,741 |  | $ 122,642
Series 2 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 70.00% |  |
Series 4 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 7000.00% |  |
Series 13 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 7000.00% |  |
Series 15 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4000.00% |  |
Series 17 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.75% |  |
Series 18 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.75% |  |
Series 25 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 0.00% |  |
Series 36 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.85% |  |
Series 37 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.90% |  |
Series 9 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 2.75% |  |
Series 24 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 3.24% |  |
Series 26 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 3.47% |  |
Series 28 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 2.73% |  |
Series 30 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.69% |  |
Series 32 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 5.06% |  |
Series 34 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.44% |  |
Series 38 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 3.57% |  |
Series 40 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.03% |  |
Series 42 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 3.25% |  |
Series 44 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |
Series 46 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.80% |  |
Series 48 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, dividend rate, percentage | 4.75% |  |
Preferred shares | Fixed rate-reset preferred shares | Canada Bond Rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Period of government bond rate | 5 years |  |
Preferred shares | Fixed rate-reset preferred shares | Bottom of range |  |  |
Disclosure of classes of share capital [line items] |  |  |
Period of fixed dividend rate | 5 years |  |
Preferred shares | Fixed rate-reset preferred shares | Bottom of range | Canada Bond Rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, basis spread on variable rate | 18000.00% |  |
Preferred shares | Fixed rate-reset preferred shares | Top of range |  |  |
Disclosure of classes of share capital [line items] |  |  |
Period of fixed dividend rate | 6 years |  |
Preferred shares | Fixed rate-reset preferred shares | Top of range | Canada Bond Rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Preferred stock, basis spread on variable rate | 41700.00% |  |
Preferred shares | Preferred equity |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 4,145 |  | 4,145
Preferred shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | 505 |  | 531
Preferred shares | Preferred equity | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | 739 |  | 739
Preferred shares | Preferred equity | Fixed and floating rate [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | 1,244 |  | 1,270
Preferred shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 2,901 |  | $ 2,875
Preferred shares | Series 2 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 10,457,685 |  | 10,457,685
Preferred shares | Series 2 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 169 |  | $ 169
Preferred shares | Series 4 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 2,795,910 |  | 2,795,910
Preferred shares | Series 4 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 45 |  | $ 45
Preferred shares | Series 8 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 3,321,486 |  | 2,476,185
Preferred shares | Series 8 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 54 |  | $ 42
Preferred shares | Series 13 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,290,096 |  | 9,290,096
Preferred shares | Series 13 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 195 |  | $ 195
Preferred shares | Series 15 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 2,000,000 |  | 2,000,000
Preferred shares | Series 15 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 42 |  | $ 42
Preferred shares | Series 17 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 7,840,204 |  | 7,840,204
Preferred shares | Series 17 Class A Preferred Shares | Preferred equity | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 171 |  | $ 171
Preferred shares | Series 18 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 7,866,749 |  | 7,866,749
Preferred shares | Series 18 Class A Preferred Shares | Preferred equity | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 178 |  | $ 178
Preferred shares | Series 25 Class A Preferred Shares | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 0 |  | 1,529,133
Preferred shares | Series 25 Class A Preferred Shares | Preferred equity | Floating rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 0 |  | $ 38
Preferred shares | Series 36 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 7,842,909 |  | 7,842,909
Preferred shares | Series 36 Class A Preferred Shares | Preferred equity | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 197 |  | $ 197
Preferred shares | Series 37 Class A Preferred Shares | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 7,830,091 |  | 7,830,091
Preferred shares | Series 37 Class A Preferred Shares | Preferred equity | Fixed rate |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 193 |  | $ 193
Preferred shares | Series 9 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 670,680 |  | 1,515,981
Preferred shares | Series 9 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 9 |  | $ 21
Preferred shares | Series 24 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 10,808,027 |  | 9,278,894
Preferred shares | Series 24 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 265 |  | $ 227
Preferred shares | Series 26 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,770,928 |  | 9,770,928
Preferred shares | Series 26 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 240 |  | $ 240
Preferred shares | Series 28 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,233,927 |  | 9,233,927
Preferred shares | Series 28 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 232 |  | $ 232
Preferred shares | Series 30 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,787,090 |  | 9,787,090
Preferred shares | Series 30 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 241 |  | $ 241
Preferred shares | Series 32 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 11,750,299 |  | 11,750,299
Preferred shares | Series 32 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 297 |  | $ 297
Preferred shares | Series 34 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,876,735 |  | 9,876,735
Preferred shares | Series 34 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 253 |  | $ 253
Preferred shares | Series 38 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 7,906,132 |  | 7,906,132
Preferred shares | Series 38 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 179 |  | $ 179
Preferred shares | Series 40 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 11,841,025 |  | 11,841,025
Preferred shares | Series 40 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 271 |  | $ 271
Preferred shares | Series 42 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 11,887,500 |  | 11,887,500
Preferred shares | Series 42 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 266 |  | $ 266
Preferred shares | Series 44 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 9,831,929 |  | 9,831,929
Preferred shares | Series 44 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 187 |  | $ 187
Preferred shares | Series 46 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 11,740,797 |  | 11,740,797
Preferred shares | Series 46 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 217 |  | $ 217
Preferred shares | Series 48 Class A Preferred Shares | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Issued and Outstanding (in shares) | 11,885,972 |  | 11,885,972
Preferred shares | Series 48 Class A Preferred Shares | Preferred equity | Fixed rate-reset preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Equity | $ 244 |  | $ 244
Series 8 Class A Preferred Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding, converted |  | 853,503 |
Series 9 Class A Preferred Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding, converted |  | 8,202 |

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