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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies |
Schedule of changes in the asset retirement obligation |
|  | Years ended December 31, |
(Millions of dollars) |  | 2017 |  | 2016 |
Beginning balance |  | $ | 19 |  | $ | 18 |
Accretion expense |  |  | 2 |  |  | 1 |
Liability for additional lagoons placed in service |  |  | 1 |  |  | — |
Ending balance |  | $ | 22 |  | $ | 19 |
Schedule of amounts paid for interest and income taxes |
|  | Years ended December 31, |
(Millions of dollars) |  | 2017 |  | 2016 |  | 2015 |
Interest, net of interest capitalized |  | $ | 30 |  | $ | 29 |  | $ | 17 |
Income taxes, net of refunds |  |  | 32 |  |  | 31 |  |  | 60 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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