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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME | 3 Months Ended
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Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME | COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME Changes in Accumulated Other Comprehensive Income (AOCI) attributable to our common shareholders for the three months ended March 31, 2021 and 2020 are as follows:
| Cash Flow Hedges | Excluded Components of Fair Value Hedges | Net Investment Hedges | Cumulative Translation Adjustment | Equity Investees | Pension and OPEB Adjustment | Total
(millions of Canadian dollars) |  |  |  |  |  |  |
Balance as at January 1, 2021 | (1,326) |  | 5 |  | (215) |  | 568 |  | 66 |  | (499) |  | (1,401) |
Other comprehensive income/(loss) retained in AOCI | 493 |  | (1) |  | 105 |  | (774) |  | (26) |  | — |  | (203) |
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 63 |  | — |  | — |  | — |  | — |  | — |  | 63 |
Commodity contracts 2 | 1 |  | — |  | — |  | — |  | — |  | — |  | 1 |
Foreign exchange contracts 3 | 1 |  | — |  | — |  | — |  | — |  | — |  | 1 |
Amortization of pension and OPEB actuarial loss and prior service costs 4 | — |  | — |  | — |  | — |  | — |  | 7 |  | 7 |
Other | 17 |  | — |  | — |  | (20) |  | 3 |  | — |  | — |
| 575 |  | (1) |  | 105 |  | (794) |  | (23) |  | 7 |  | (131) |
Tax impact |  |  |  |  |  |  |
Income tax on amounts retained in AOCI | (120) |  | — |  | (12) |  | — |  | 4 |  | — |  | (128) |
Income tax on amounts reclassified to earnings | (13) |  | — |  | — |  | — |  | — |  | (2) |  | (15) |
| (133) |  | — |  | (12) |  | — |  | 4 |  | (2) |  | (143) |
Balance as at March 31, 2021 | (884) |  | 4 |  | (122) |  | (226) |  | 47 |  | (494) |  | (1,675) |
| Cash Flow Hedges | Excluded Components of Fair Value Hedges | Net Investment Hedges | Cumulative Translation Adjustment | Equity Investees | Pension and OPEB Adjustment | Total
(millions of Canadian dollars) |  |  |  |  |  |  |
Balance as at January 1, 2020 | (1,073) |  | — |  | (317) |  | 1,396 |  | 67 |  | (345) |  | (272) |
Other comprehensive income/(loss) retained in AOCI | (693) |  | 3 |  | (715) |  | 5,459 |  | (7) |  | — |  | 4,047 |
Other comprehensive loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 43 |  | — |  | — |  | — |  | — |  | — |  | 43 |
Foreign exchange contracts 3 | 1 |  | — |  | — |  | — |  | — |  | — |  | 1 |
Amortization of pension and OPEB actuarial loss and prior service costs 4 | — |  | — |  | — |  | — |  | — |  | 4 |  | 4 |
| (649) |  | 3 |  | (715) |  | 5,459 |  | (7) |  | 4 |  | 4,095 |
Tax impact |  |  |  |  |  |  |
Income tax on amounts retained in AOCI | 182 |  | — |  | — |  | — |  | (3) |  | — |  | 179 |
Income tax on amounts reclassified to earnings | (12) |  | — |  | — |  | — |  | — |  | (1) |  | (13) |
| 170 |  | — |  | — |  | — |  | (3) |  | (1) |  | 166 |
Balance as at March 31, 2020 | (1,552) |  | 3 |  | (1,032) |  | 6,855 |  | 57 |  | (342) |  | 3,989 |
1 Reported within Interest expense in the Consolidated Statements of Earnings. 2 Reported within Transportation and other services revenues, Commodity sales revenues, Commodity costs and Operating and administrative expense in the Consolidated Statements of Earnings. 3 Reported within Transportation and other services revenues and Net foreign currency gain/(loss) in the Consolidated Statements of Earnings. 4 These components are included in the computation of net periodic benefit costs and are reported within Other income/(expense) in the Consolidated Statements of Earnings.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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