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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of shares of common stock | The following table summarizes total shares of common stock outstanding:
| December 31
Millions of shares | 2017 | 2016
Issued | 1,069 |  | 1,070 |
In treasury | (196 | ) | (204 | )
Total shares of common stock outstanding | 873 |  | 866 |
Schedule of accumulated other comprehensive income (loss) | Accumulated other comprehensive loss consisted of the following:
| December 31
Millions of dollars | 2017 | 2016
Defined benefit and other postretirement liability adjustments (a) | $ | (334 | ) | $ | (313 | )
Cumulative translation adjustment | (80 | ) | (80 | )
Other | (55 | ) | (61 | )
Total accumulated other comprehensive loss | $ | (469 | ) | $ | (454 | )
(a) Included net actuarial losses for our international pension plans of $295 million at December 31, 2017 and $290 million at December 31, 2016

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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=84228862&loc=SL7669686-108580 + Details
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