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Other long-term obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Long-Term Obligations |
millions of Canadian dollars |  | 2019 |  |  | 2018 |
Employee retirement benefits (a) (note 5) |  |  | 1,822 |  |  |  | 1,195 |
Asset retirement obligations and other environmental liabilities (b) (d) |  |  | 1,388 |  |  |  | 1,435 |
Share-based incentive compensation liabilities (note 8) |  |  | 65 |  |  |  | 78 |
Operating lease liability (c) (note 14) |  |  | 143 |  |  |  | - |
Other obligations |  |  | 219 |  |  |  | 235 |
Total other long-term obligations |  |  | 3,637 |  |  |  | 2,943 |
(a) | Total recorded employee retirement benefits obligations also included $58 million in current liabilities (2018 – $55 million). |
(b) | Total asset retirement obligations and other environmental liabilities also included $124 million in current liabilities (2018 – $118 million). |
(c) | Effective January 1, 2019, Imperial adopted the Financial Accounting Standards Board’s standard, Leases (Topic 842), as amended. The standard requires all leases to be recorded on the balance sheet as a right of use asset and liability. The long-term lease liability for operating leases is included in Other long-term obligations (see note 14). |
(d) | For 2019, the asset retirement obligations were discounted at 6 percent (2018 - 6 percent). |
Schedule of Asset Retirement Obligations | Asset retirement obligations incurred in the current period were Level 3 fair value measurements. The following table summarizes the activity in the liability for asset retirement obligations:
millions of Canadian dollars |  | 2019 |  |  | 2018 |
Balance as at January 1 |  |  | 1,417 |  |  |  | 1,397 |
Additions (deductions) |  |  | (23 | ) |  |  | (5 | )
Accretion |  |  | 80 |  |  |  | 85 |
Settlement |  |  | (74 | ) |  |  | (60 | )
Balance as at December 31 |  |  | 1,400 |  |  |  | 1,417 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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