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Other long-term obligations (Tables) | 12 Months Ended
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Dec. 31, 2014
Other Long-Term Obligations |
millions of dollars |  | 2014 |  |  | 2013 |
Employee retirement benefits (a)(note 4) |  |  | 1,739 |  |  |  | 1,448 |
Asset retirement obligations and other environmental liabilities (b) |  |  | 1,325 |  |  |  | 1,258 |
Share-based incentive compensation liabilities (note 7) |  |  | 154 |  |  |  | 140 |
Other obligations (note 16) |  |  | 347 |  |  |  | 245 |
Total other long-term obligations |  |  | 3,565 |  |  |  | 3,091 |
| (a) | Total recorded employee retirement benefit obligations also include $58 million in current liabilities (2013 – $53 million).
| (b) | Total asset retirement obligations and other environmental liabilities also include $143 million in current liabilities (2013 – $154 million).
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 dollars |  | 2014 |  |  | 2013 |
Balance as at January 1 |  |  | 1,237 |  |  |  | 966 |
Additions |  |  | 184 |  |  |  | 251 |
Reductions due to property sales |  |  | (153) |  |  |  | - |
Accretion |  |  | 105 |  |  |  | 105 |
Settlement |  |  | (81) |  |  |  | (85 | )
Balance as at December 31 |  |  | 1,292 |  |  |  | 1,237 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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