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Other comprehensive income (loss) information (Tables) | 12 Months Ended
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Dec. 31, 2019
Changes in Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss):
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Balance at January 1 |  |  | (1,517 | ) |  |  | (1,815 | ) |  |  | (1,897 | )
Postretirement benefits liability adjustment: |  |  |  |  |  |  |  |  |  |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income |  |  | (505 | ) |  |  | 158 |  |  |  | (54 | )
Amounts reclassified from accumulated other comprehensive income |  |  | 111 |  |  |  | 140 |  |  |  | 136 |
Balance at December 31 |  |  | (1,911 | ) |  |  | (1,517 | ) |  |  | (1,815 | )
Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) - Before-Tax Income (Expense) |
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Amortization of postretirement benefits liability adjustment included in net periodic benefit cost (a) |  |  | (148 | ) |  |  | (185 | ) |  |  | (194 | )
(a) This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 5) . |
Income Tax Expense (Credit) for Components of Other Comprehensive Income (Loss) |
millions of Canadian dollars |  | 2019 |  |  | 2018 |  |  | 2017 |
Postretirement benefits liability adjustments: |  |  |  |  |  |  |  |  |  |  |  |
Postretirement benefits liability adjustment (excluding amortization) |  |  | (165 | ) |  |  | 59 |  |  |  | (20 | )
Amortization of postretirement benefits liability adjustment included in net periodic benefit cost |  |  | 37 |  |  |  | 45 |  |  |  | 58 |
Total |  |  | (128 | ) |  |  | 104 |  |  |  | 38 |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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