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Employee retirement benefits (Tables) | 3 Months Ended
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Mar. 31, 2022
Schedule of Net Benefit Costs | The components of net benefit cost were as follows:
|  | Three Months to March 31 |
millions of Canadian dollars |  | 2022 |  |  | 2021 |
Pension benefits: |  |  |  |  |  |  |  |
Service cost |  |  | 70 |  |  |  | 81 |
Interest cost |  |  | 73 |  |  |  | 68 |
Expected return on plan assets |  |  | (103 | ) |  |  | (107 | )
Amortization of prior service cost |  |  | 4 |  |  |  | 4 |
Amortization of actuarial loss (gain) |  |  | 22 |  |  |  | 36 |
Net benefit cost |  |  | 66 |  |  |  | 82 |
Other postretirement benefits: |  |  |  |  |  |  |  |
Service cost |  |  | 6 |  |  |  | 7 |
Interest cost |  |  | 6 |  |  |  | 6 |
Amortization of actuarial loss (gain) |  |  | 2 |  |  |  | 4 |
Net benefit cost |  |  | 14 |  |  |  | 17 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration