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Other comprehensive income (loss) information | 3 Months Ended
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Mar. 31, 2022
Other comprehensive income (loss) information | 10. Other comprehensive income (loss) information Changes in accumulated other comprehensive income (loss):
millions of Canadian dollars |  |  | 2022 |  |  |  | 2021 |
Balance at January 1 |  |  | (1,177 | ) |  |  | (1,989 | )
Postretirement benefits liability adjustment: |  |  |  |  |  |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income |  |  | 24 |  |  |  | 54 |
Amounts reclassified from accumulated other comprehensive income |  |  | 21 |  |  |  | 33 |
Balance at March 31 |  |  | (1,132 | ) |  |  | (1,902 | )
Amounts reclassified out of accumulated other comprehensive income (loss) - before tax income (expense):
|  |  | Three Months |
|  |  | to March 31 |
millions of Canadian dollars |  |  | 2022 |  |  |  | 2021 |
Amortization of postretirement benefits liability adjustment included in net benefit cost (a) |  |  | (28 | ) |  |  | (44 | )
(a) This accumulated other comprehensive income component is included in the computation of net benefit cost (note 4). |
Income tax expense (credit) for components of other comprehensive income (loss):
|  |  | Three Months |
|  | to March 31 |
millions of Canadian dollars |  |  | 2022 |  |  |  | 2021 |
Postretirement benefits liability adjustments: |  |  |  |  |  |  |  |
Postretirement benefits liability adjustment (excluding amortization) |  |  | 8 |  |  |  | 17 |
Amortization of postretirement benefits liability adjustment included in net benefit cost |  |  | 7 |  |  |  | 11 |
Total |  |  | 15 |  |  |  | 28 |

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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=123367319&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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