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Other comprehensive income (loss) information | 12 Months Ended
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Dec. 31, 2019
Other comprehensive income (loss) information | 18. Other comprehensive income (loss) information 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 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 + Details
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Namespace Prefix: | us-gaap_
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