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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of accumulated other comprehensive loss |  |  |
Balance | $ 73,435 | $ 65,732 |
Other comprehensive income/(loss) retained in AOCI | (3,296) | 3,479 | $ (2,137)
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 17 | 16 | 41
Other comprehensive (income)/loss reclassified to earnings | (3,121) | 3,680 | (1,908)
Income tax on amounts retained in AOCI | 164 | 148 | (30)
Income tax on amounts reclassified to earnings | (35) | (41) | (93)
Tax impact | 129 | 107 | (123)
Other | 48 | (142) |
Balance | 69,407 | 73,435 | 65,732
Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 157 | 157 | 207
Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (1) | (1) | (7)
Forward exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 5 | 7 | (6)
Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (3) | 22 | (6)
Cash Flow Hedges |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | (770) | (644) | (746)
Other comprehensive income/(loss) retained in AOCI | (599) | (244) | 1
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | (441) | (59) | 189
Income tax on amounts retained in AOCI | 169 | 57 | (16)
Income tax on amounts reclassified to earnings | (31) | (37) | (71)
Tax impact | 138 | 20 | (87)
Other |  | (87) |
Balance | (1,073) | (770) | (644)
Cash Flow Hedges | Interest rate contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 157 | 157 | 207
Cash Flow Hedges | Commodity contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (1) | (1) | (7)
Cash Flow Hedges | Forward exchange contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 5 | 7 | (6)
Cash Flow Hedges | Other contracts |  |  |
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | (3) | 22 | (6)
Net Investment Hedges |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | (598) | (139) | (629)
Other comprehensive income/(loss) retained in AOCI | 320 | (509) | 478
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 320 | (509) | 478
Income tax on amounts retained in AOCI | (39) | 50 | 12
Tax impact | (39) | 50 | 12
Balance | (317) | (598) | (139)
Cumulative Translation Adjustment |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | 4,323 | 77 | 2,700
Other comprehensive income/(loss) retained in AOCI | (2,927) | 4,301 | (2,623)
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | (2,927) | 4,301 | (2,623)
Other |  | (55) |
Balance | 1,396 | 4,323 | 77
Equity Investees |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | 34 | 10 | 37
Other comprehensive income/(loss) retained in AOCI | 34 | 16 | (11)
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 34 | 16 | (11)
Income tax on amounts retained in AOCI | 6 | 8 | (16)
Tax impact | 6 | 8 | (16)
Other | (7) |  |
Balance | 67 | 34 | 10
Pension and OPEB Adjustment |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | (317) | (277) | (304)
Other comprehensive income/(loss) retained in AOCI | (124) | (85) | 18
Changes in AOCI |  |  |
Amortization of pension and OPEB actuarial loss and prior service costs | 17 | 16 | 41
Other comprehensive (income)/loss reclassified to earnings | (107) | (69) | 59
Income tax on amounts retained in AOCI | 28 | 33 | (10)
Income tax on amounts reclassified to earnings | (4) | (4) | (22)
Tax impact | 24 | 29 | (32)
Other | 55 | 0 |
Balance | (345) | (317) | (277)
Total |  |  |
Components of accumulated other comprehensive loss |  |  |
Balance | 2,672 | (973) | 1,058
Changes in AOCI |  |  |
Balance | $ (272) | $ 2,672 | $ (973)

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