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Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity and Accumulated Other Comprehensive Loss |
Schedule of components of accumulated other comprehensive loss, net of related taxes |
|  | Cumulative |  |  |  |  |  |  |  |  |  |
|  | Foreign |  | Unrealized |  |  |  |  |  |  |
|  | Currency |  | Gain |  | Unrecognized |  |  |  |
|  | Translation |  | on |  | Pension |  |  |  |
(Millions of dollars) |  | Adjustment |  | Investments |  | Cost |  | Total |
Balance December 31, 2015 |  | $ | (228) |  | $ | 1 |  | $ | (51) |  | $ | (278) |
Other comprehensive income (loss) before reclassifications |  |  | (26) |  |  | 1 |  |  | (4) |  |  | (29) |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  | — |  |  | — |  |  | 3 | (1) |  | 3 |
Other comprehensive income (loss), net of tax |  |  | (26) |  |  | 1 |  |  | (1) |  |  | (26) |
Balance December 31, 2016 |  | $ | (254) |  | $ | 2 |  | $ | (52) |  | $ | (304) |
Other comprehensive income (loss) before reclassifications |  |  | (6) |  |  | 5 |  |  | (8) |  |  | (9) |
Amounts reclassified from accumulated other comprehensive loss to net earnings |  |  | — |  |  | — |  |  | 4 | (1) |  | 4 |
Other comprehensive income (loss), net of tax |  |  | (6) |  |  | 5 |  |  | (4) |  |  | (5) |
Amounts reclassified from accumulated other comprehensive loss to retained earnings |  |  | (37) | (2) |  | — |  |  | (8) | (2) |  | (45) |
Balance December 31, 2017 |  | $ | (297) |  | $ | 7 |  | $ | (64) |  | $ | (354) |
(1) This primarily represents the amortization of actuarial losses that were included in net periodic pension cost and recorded in operating income. See Note 9 for further discussion. (2) This represents the adoption of accounting guidance to reclassify $45 million of tax effects from accumulated other comprehensive loss to retained earnings in the consolidated financial statements for the year ended December 31, 2017.

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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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