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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in AOCI |  |  |
Balance at beginning of year | $ 63,398 | $ 63,368 |
Other comprehensive income/(loss) retained in AOCI | (1,144) | 4,816 | $ 298
Other |  | 16 | 0
Other comprehensive (income)/loss reclassified to earnings | (1,187) | 5,004 | 564
Income tax on amounts retained in AOCI | (33) | (349) | (187)
Income tax on amounts reclassified to earnings | 3 | (39) | (72)
Tax impact | (30) | (388) | (259)
Balance at end of year | 64,483 | 63,398 | 63,368
Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 28 | 186 | 296
Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  |  | 1
Foreign exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (47) | (4) | 5
Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  | 4 | 2
Equity investment disposal |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  |  | (66)
Total |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | 3,520 | (1,096) | (1,401)
Balance at end of year | 2,303 | 3,520 | (1,096)
Cash Flow Hedges |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | 121 | (897) | (1,326)
Other comprehensive income/(loss) retained in AOCI | 232 | 1,125 | 238
Other |  | 0 | 17
Other comprehensive (income)/loss reclassified to earnings | 260 | 1,311 | 559
Income tax on amounts retained in AOCI | (47) | (250) | (61)
Income tax on amounts reclassified to earnings | (14) | (43) | (69)
Tax impact | (61) | (293) | (130)
Balance at end of year | 320 | 121 | (897)
Cash Flow Hedges | Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 28 | 186 | 296
Cash Flow Hedges | Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  |  | 1
Cash Flow Hedges | Foreign exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 0 | (4) | 5
Cash Flow Hedges | Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  | 4 | 2
Excluded Components of Fair Value Hedges |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | (35) | 0 | 5
Other comprehensive income/(loss) retained in AOCI | 62 | (35) | (5)
Other comprehensive (income)/loss reclassified to earnings | 15 | (35) | (5)
Income tax on amounts retained in AOCI | (14) |  |
Income tax on amounts reclassified to earnings | 11 |  |
Tax impact | (3) | 0 | 0
Balance at end of year | (23) | (35) | 0
Excluded Components of Fair Value Hedges | Foreign exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (47) |  |
Net Investment Hedges |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | (1,137) | (166) | (215)
Other comprehensive income/(loss) retained in AOCI | 409 | (971) | 49
Other comprehensive (income)/loss reclassified to earnings | 409 | (971) | 49
Income tax on amounts retained in AOCI | 0 |  |
Income tax on amounts reclassified to earnings | 0 |  |
Tax impact | 0 | 0 | 0
Balance at end of year | (728) | (1,137) | (166)
Cumulative Translation Adjustment |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | 4,348 | 56 | 568
Other comprehensive income/(loss) retained in AOCI | (1,695) | 4,292 | (492)
Other |  | 0 | (20)
Other comprehensive (income)/loss reclassified to earnings | (1,695) | 4,292 | (512)
Income tax on amounts retained in AOCI | 0 |  |
Income tax on amounts reclassified to earnings | 0 |  |
Tax impact | 0 | 0 |
Balance at end of year | 2,653 | 4,348 | 56
Equity Investees |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | 5 | (5) | 66
Other comprehensive income/(loss) retained in AOCI | 6 | (6) | (12)
Other |  | 16 | 3
Other comprehensive (income)/loss reclassified to earnings | 6 | 10 | (75)
Income tax on amounts retained in AOCI | 0 |  |
Income tax on amounts reclassified to earnings | 0 |  | 4
Tax impact | 0 | 0 | 4
Balance at end of year | 11 | 5 | (5)
Equity Investees | Equity investment disposal |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs |  |  | (66)
Pension and OPEB Adjustment |  |  |
Changes in AOCI |  |  |
Balance at beginning of year | 218 | (84) | (499)
Other comprehensive income/(loss) retained in AOCI | (158) | 411 | 520
Amortization of pension and OPEB actuarial loss and prior service costs | (24) | (14) | 28
Other comprehensive (income)/loss reclassified to earnings | (182) | 397 | 548
Income tax on amounts retained in AOCI | 28 | (99) | (126)
Income tax on amounts reclassified to earnings | 6 | 4 | (7)
Tax impact | 34 | (95) | (133)
Balance at end of year | $ 70 | $ 218 | $ (84)

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