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Other comprehensive income information | 12 Months Ended
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Dec. 31, 2014
Other comprehensive income information | 17. Other comprehensive income information Changes in accumulated other comprehensive income:
millions of dollars |  | 2014 |  | 2013 |  | 2012
Balance as at January 1 |  | (1,721) |  | (2,455) |  | (2,238)
Post-retirement benefits liability adjustment: |  |  |  |  |  |
Current period change excluding amounts reclassified from accumulated other comprehensive income |  | (483) |  | 529 |  | (415)
Amounts reclassified from accumulated other comprehensive income |  | 145 |  | 205 |  | 198
Balance as at December 31 |  | (2,059) |  | (1,721) |  | (2,455)
Amounts reclassified out of accumulated other comprehensive income – before tax income/(expense)
millions of dollars |  | 2014 |  | 2013 |  | 2012
Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost (a) |  | (196) |  | (276) |  | (266)
| (a) | This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 4).
Income tax expense/(credit) for components of other comprehensive income
millions of dollars |  | 2014 |  | 2013 |  | 2012
Post-retirement benefits adjustments: |  |  |  |  |  |
Post-retirement benefits liability adjustment (excluding amortization) |  | (169) |  | 185 |  | (155)
Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost |  | 51 |  | 71 |  | 68
Total |  | (118) |  | 256 |  | (87)

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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