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Other comprehensive income information (Tables) | 12 Months Ended
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Dec. 31, 2013
Changes in Accumulated Other Comprehensive Income | Changes in accumulated other comprehensive income:
millions of dollars |  | 2013 |  |  | 2012 |  |  | 2011 |
Balance as at January 1 |  |  | (2,455 | ) |  |  | (2,238 | ) |  |  | (1,424 | )
Post-retirement benefits liability adjustment: |  |  |  |  |  |  |  |  |  |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income |  |  | 529 |  |  |  | (415 | ) |  |  | (953 | )
Amounts reclassified from accumulated other comprehensive income |  |  | 205 |  |  |  | 198 |  |  |  | 139 |
Balance as at December 31 |  |  | (1,721 | ) |  |  | (2,455 | ) |  |  | (2,238 | )
Amounts Reclassified Out of Accumulated Other Comprehensive Income Before-Tax Income/(Expense) | Amounts reclassified out of accumulated other comprehensive income – before tax income/(expense)
millions of dollars |  | 2013 |  |  | 2012 |  |  | 2011 |
Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost (a) |  |  | (276 | ) |  |  | (266 | ) |  |  | (186 | )
(a) | This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 4).
Schedule of Income Tax Expense/(Credit) for Components of Other Comprehensive Income | Income tax expense/(credit) for components of other comprehensive income
millions of dollars |  | 2013 |  |  | 2012 |  |  | 2011 |
Post-retirement benefits adjustments: |  |  |  |  |  |  |  |  |  |  |  |
Post-retirement benefits liability adjustment (excluding amortization) |  |  | 185 |  |  |  | (155 | ) |  |  | (326 | )
Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost |  |  | 71 |  |  |  | 68 |  |  |  | 47 |
Total |  |  | 256 |  |  |  | (87 | ) |  |  | (279 | )

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 + Details
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