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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Changes in AOCI |  |
Balance at the beginning of the period | $ 64,363 |
Other comprehensive income/(loss) retained in AOCI | (203) | $ 4,047
Total before tax impact | (131) | 4,095
Income tax on amounts retained in AOCI | (128) | 179
Income tax on amounts reclassified to earnings | (15) | (13)
Tax impact | (143) | 166
Balance at the end of the period | 65,988 | 72,291
Interest rate contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 63 | 43
Commodity contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 1 |
Foreign exchange contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 1 | 1
Other contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 0 |
Total |  |
Changes in AOCI |  |
Balance at the beginning of the period | (1,401) | (272)
Balance at the end of the period | (1,675) | 3,989
Cash Flow Hedges |  |
Changes in AOCI |  |
Balance at the beginning of the period | (1,326) | (1,073)
Other comprehensive income/(loss) retained in AOCI | 493 | (693)
Total before tax impact | 575 | (649)
Income tax on amounts retained in AOCI | (120) | 182
Income tax on amounts reclassified to earnings | (13) | (12)
Tax impact | (133) | 170
Balance at the end of the period | (884) | (1,552)
Cash Flow Hedges | Interest rate contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 63 | 43
Cash Flow Hedges | Commodity contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 1 |
Cash Flow Hedges | Foreign exchange contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 1 | 1
Cash Flow Hedges | Other contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 17 |
Excluded Components of Fair Value Hedges |  |
Changes in AOCI |  |
Balance at the beginning of the period | 5 | 0
Other comprehensive income/(loss) retained in AOCI | (1) | 3
Total before tax impact | (1) | 3
Income tax on amounts retained in AOCI | 0 | 0
Income tax on amounts reclassified to earnings | 0 | 0
Tax impact | 0 | 0
Balance at the end of the period | 4 | 3
Net Investment Hedges |  |
Changes in AOCI |  |
Balance at the beginning of the period | (215) | (317)
Other comprehensive income/(loss) retained in AOCI | 105 | (715)
Total before tax impact | 105 | (715)
Income tax on amounts retained in AOCI | (12) | 0
Income tax on amounts reclassified to earnings | 0 | 0
Tax impact | (12) | 0
Balance at the end of the period | (122) | (1,032)
Cumulative Translation Adjustment |  |
Changes in AOCI |  |
Balance at the beginning of the period | 568 | 1,396
Other comprehensive income/(loss) retained in AOCI | (774) | 5,459
Total before tax impact | (794) | 5,459
Income tax on amounts retained in AOCI | 0 | 0
Income tax on amounts reclassified to earnings | 0 | 0
Tax impact | 0 | 0
Balance at the end of the period | (226) | 6,855
Cumulative Translation Adjustment | Other contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | (20) |
Equity Investees |  |
Changes in AOCI |  |
Balance at the beginning of the period | 66 | 67
Other comprehensive income/(loss) retained in AOCI | (26) | (7)
Total before tax impact | (23) | (7)
Income tax on amounts retained in AOCI | 4 | (3)
Income tax on amounts reclassified to earnings | 0 | 0
Tax impact | 4 | (3)
Balance at the end of the period | 47 | 57
Equity Investees | Other contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | 3 |
Pension and OPEB Adjustment |  |
Changes in AOCI |  |
Balance at the beginning of the period | (499) | (345)
Other comprehensive (income)/loss reclassified to earnings | 7 | 4
Total before tax impact | 7 | 4
Income tax on amounts retained in AOCI | 0 | 0
Income tax on amounts reclassified to earnings | (2) | (1)
Tax impact | (2) | (1)
Balance at the end of the period | (494) | $ (342)
Pension and OPEB Adjustment | Other contracts |  |
Changes in AOCI |  |
Other comprehensive (income)/loss reclassified to earnings | $ 0 |

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