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Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2017 | ​ | $ | (297) | ​ | $ | 7 | ​ | $ | (64) | ​ | $ | (354) | ​
Other comprehensive loss before reclassifications | ​ |  | (52) | ​ |  | — | ​ |  | (1) | ​ |  | (53) | ​
Amounts reclassified from accumulated other comprehensive loss to net loss | ​ |  | — | ​ |  | — | ​ |  | 4 | (a) |  | 4 | ​
Other comprehensive income (loss), net of tax | ​ |  | (52) | ​ |  | — | ​ |  | 3 | ​ |  | (49) | ​
Amounts reclassified from accumulated other comprehensive loss to retained earnings | ​ | ​ | — | ​ | ​ | (7) | (b) | ​ | — | ​ | ​ | (7) | ​
Balance December 31, 2018 | ​ | $ | (349) | ​ | $ | — | ​ | $ | (61) | ​ | $ | (410) | ​
Other comprehensive loss before reclassifications | ​ |  | (20) | ​ |  | — | ​ |  | (14) | ​ |  | (34) | ​
Amounts reclassified from accumulated other comprehensive loss to net earnings | ​ |  | — | ​ |  | — | ​ |  | 4 | (a) |  | 4 | ​
Other comprehensive loss, net of tax | ​ |  | (20) | ​ |  | — | ​ |  | (10) | ​ |  | (30) | ​
Balance December 31, 2019 | ​ | $ | (369) | ​ | $ | — | ​ | $ | (71) | ​ | $ | (440) | ​
(a)This primarily represents the amortization of actuarial losses that was included in net periodic pension cost and recorded in operating income. See Note 10 for further discussion. (b)Effective January 1, 2018, upon adoption of new guidance, all unrealized gains (losses) on investments were included in the consolidated statement of comprehensive income. The AOCI balance as of December 31, 2017, was reclassified to retained earnings on January 1, 2018. ​ ​

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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