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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | $ 64,363 | $ 69,407 |
Other comprehensive income/(loss) retained in AOCI | 298 | (1,522) | $ (3,296)
Changes in AOCI |  |  |
Other | 0 |  | 48
Other comprehensive (income)/loss reclassified to earnings | 564 | (1,249) | (3,121)
Income tax on amounts retained in AOCI | (187) | 182 | 164
Income tax on amounts reclassified to earnings | (72) | (62) | (35)
Tax impact | (259) | 120 | 129
Balance at end of year | 63,368 | 64,363 | 69,407
Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 296 | 253 | 157
Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 1 |  | (1)
Forward exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 5 | 5 | 5
Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 2 | (2) | (3)
Equity investment disposal |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 0 |  |
Cash Flow Hedges |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | (1,326) | (1,073) | (770)
Other comprehensive income/(loss) retained in AOCI | 238 | (591) | (599)
Changes in AOCI |  |  |
Other | 17 |  | 0
Other comprehensive (income)/loss reclassified to earnings | 559 | (335) | (441)
Income tax on amounts retained in AOCI | (61) | 140 | 169
Income tax on amounts reclassified to earnings | (69) | (58) | (31)
Tax impact | (130) | 82 | 138
Balance at end of year | (897) | (1,326) | (1,073)
Cash Flow Hedges | Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 296 | 253 | 157
Cash Flow Hedges | Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 1 |  | (1)
Cash Flow Hedges | Forward exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 5 | 5 | 5
Cash Flow Hedges | Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 2 | (2) | (3)
Excluded Components of Fair Value Hedges |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | 5 | 0 |
Other comprehensive income/(loss) retained in AOCI | (5) | 5 |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | (5) | 5 |
Income tax on amounts retained in AOCI | 0 | 0 |
Income tax on amounts reclassified to earnings | 0 | 0 |
Tax impact | 0 | 0 |
Balance at end of year | 0 | 5 | 0
Net Investment Hedges |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | (215) | (317) | (598)
Other comprehensive income/(loss) retained in AOCI | 49 | 115 | 320
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 49 | 115 | 320
Income tax on amounts retained in AOCI | 0 | (13) | (39)
Income tax on amounts reclassified to earnings | 0 | 0 |
Tax impact | 0 | (13) | (39)
Balance at end of year | (166) | (215) | (317)
Cumulative Translation Adjustment |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | 568 | 1,396 | 4,323
Other comprehensive income/(loss) retained in AOCI | (492) | (828) | (2,927)
Changes in AOCI |  |  |
Other | (20) |  | 0
Other comprehensive (income)/loss reclassified to earnings | (512) | (828) | (2,927)
Income tax on amounts retained in AOCI | 0 | 0 |
Income tax on amounts reclassified to earnings | 0 | 0 |
Tax impact | 0 | 0 |
Balance at end of year | 56 | 568 | 1,396
Equity Investees |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | 66 | 67 | 34
Other comprehensive income/(loss) retained in AOCI | (12) | (2) | 34
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 66 |  |
Other | 3 |  | (7)
Other comprehensive (income)/loss reclassified to earnings | (75) | (2) | 34
Income tax on amounts retained in AOCI | 0 | 1 | 6
Income tax on amounts reclassified to earnings | 4 | 0 |
Tax impact | 4 | 1 | 6
Balance at end of year | (5) | 66 | 67
Pension and OPEB Adjustment |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | (499) | (345) | (317)
Other comprehensive income/(loss) retained in AOCI | 520 | (221) | (124)
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 28 | 17 | 17
Other |  |  | 55
Other comprehensive (income)/loss reclassified to earnings | 548 | (204) | (107)
Income tax on amounts retained in AOCI | (126) | 54 | 28
Income tax on amounts reclassified to earnings | (7) | (4) | (4)
Tax impact | (133) | 50 | 24
Balance at end of year | (84) | (499) | (345)
Total |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance at beginning of year | (1,401) | (272) | 2,672
Changes in AOCI |  |  |
Balance at end of year | $ (1,096) | $ (1,401) | $ (272)

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