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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in AOCI |  |  |
Balance at the beginning of the period | $ 58,135 |  |
Balance at the end of the period | 69,470 | $ 58,135 |
Accumulated other comprehensive income/(loss) |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | (973) | 1,058 | $ 1,632
Other comprehensive income/(loss) retained in AOCI | 3,479 | (2,137) | (760)
Other comprehensive (income)/loss reclassified to earnings, Pension and OPEB | 16 | 41 | 21
Total before tax impact | 3,680 | (1,908) | (620)
Income tax on amounts retained in AOCI | 148 | (30) | 102
Income tax on amounts reclassified to earnings | (41) | (93) | (56)
Tax impact | 107 | (123) | 46
Sponsored Vehicle buy-in | (142) |  |
Balance at the end of the period | 2,672 | (973) | 1,058
Accumulated other comprehensive income/(loss) | Interest rate contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges | 157 | 207 | 147
Accumulated other comprehensive income/(loss) | Commodity contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges | (1) | (7) | (11)
Accumulated other comprehensive income/(loss) | Forward currency contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges | 7 | (6) | 1
Accumulated other comprehensive income/(loss) | Other contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings, Cash Flow Hedges | 22 | (6) | (18)
Cash Flow Hedges |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | (644) | (746) | (688)
Other comprehensive income/(loss) retained in AOCI | (244) | 1 | (216)
Total before tax impact | (59) | 189 | (97)
Income tax on amounts retained in AOCI | 57 | (16) | 91
Income tax on amounts reclassified to earnings | (37) | (71) | (52)
Tax impact | 20 | (87) | 39
Sponsored Vehicle buy-in | (87) |  |
Balance at the end of the period | (770) | (644) | (746)
Cash Flow Hedges | Interest rate contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 157 | 207 | 147
Cash Flow Hedges | Commodity contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | (1) | (7) | (11)
Cash Flow Hedges | Forward currency contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 7 | (6) | 1
Cash Flow Hedges | Other contracts |  |  |
Changes in AOCI |  |  |
Other comprehensive (income)/loss reclassified to earnings | 22 | (6) | (18)
Net Investment Hedges |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | (139) | (629) | (795)
Other comprehensive income/(loss) retained in AOCI | (509) | 478 | 171
Total before tax impact | (509) | 478 | 171
Income tax on amounts retained in AOCI | 50 | 12 | (5)
Tax impact | 50 | 12 | (5)
Balance at the end of the period | (598) | (139) | (629)
Cumulative Translation Adjustment |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | 77 | 2,700 | 3,365
Other comprehensive income/(loss) retained in AOCI | 4,301 | (2,623) | (665)
Total before tax impact | 4,301 | (2,623) | (665)
Tax impact | 0 | 0 | 0
Balance at the end of the period | 4,323 | 77 | 2,700
Equity Investees |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | 10 | 37 | 37
Other comprehensive income/(loss) retained in AOCI | 16 | (11) | (5)
Total before tax impact | 16 | (11) | (5)
Income tax on amounts retained in AOCI | 8 | (16) | 5
Tax impact | 8 | (16) | 5
Balance at the end of the period | 34 | 10 | 37
Pension and OPEB Adjustment |  |  |
Changes in AOCI |  |  |
Balance at the beginning of the period | (277) | (304) | (287)
Other comprehensive income/(loss) retained in AOCI | (85) | 18 | (45)
Other comprehensive (income)/loss reclassified to earnings, Pension and OPEB | 16 | 41 | 21
Total before tax impact | (69) | 59 | (24)
Income tax on amounts retained in AOCI | 33 | (10) | 11
Income tax on amounts reclassified to earnings | (4) | (22) | (4)
Tax impact | 29 | (32) | 7
Balance at the end of the period | $ (317) | $ (277) | $ (304)

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