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Other long-term obligations | 12 Months Ended
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Dec. 31, 2013
Other long-term obligations | 5. Other long-term obligations
millions of dollars |  | 2013 |  |  | 2012 |
Employee retirement benefits (note 4)(a) |  |  | 1,448 |  |  |  | 2,717 |
Asset retirement obligations and other environmental liabilities (b) |  |  | 1,258 |  |  |  | 957 |
Share-based incentive compensation liabilities (note 7) |  |  | 140 |  |  |  | 117 |
Other obligations |  |  | 245 |  |  |  | 192 |
Total other long-term obligations |  |  | 3,091 |  |  |  | 3,983 |
(a) | Total recorded employee retirement benefit obligations also include $53 million in current liabilities (2012 – $52 million).
(b) | Total asset retirement obligations and other environmental liabilities also include $154 million in current liabilities (2012 – $168 million).
Asset retirement obligations incurred in the current period were Level 3 (unobservable inputs) fair value measurements. The following table summarizes the activity in the liability for asset retirement obligations:
millions of dollars |  | 2013 |  |  | 2012 |
Balance as at January 1 |  |  | 966 |  |  |  | 936 |
Additions |  |  | 251 |  |  |  | 61 |
Reductions due to property sales |  |  | - |  |  |  | (8 | )
Accretion |  |  | 105 |  |  |  | 86 |
Settlement |  |  | (85 | ) |  |  | (109 | )
Balance as at December 31 |  |  | 1,237 |  |  |  | 966 |

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 24 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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