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Other comprehensive income (loss) information (Tables) | 3 Months Ended
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Mar. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss) | 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) |
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) |
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 Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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