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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of accumulated other comprehensive income in the equity section of the balance sheet |
Note 16—Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss in the equity section of our consolidated balance sheet included:
|  | Millions of Dollars
|  | Defined Benefit Plans |  | Net Unrealized Loss on Securities |  | Foreign Currency Translation |  | Accumulated Other Comprehensive Income (Loss)
December 31, 2017 | $ | (400) |  | (58) |  | (5,060) |  | (5,518)
Cumulative effect of adopting ASU No. 2016-01* |  | - |  | 58 |  | - |  | 58
Other comprehensive income (loss) |  | 240 |  | - |  | (222) |  | 18
September 30, 2018 | $ | (160) |  | - |  | (5,282) |  | (5,442)
*See Note 2—Changes in Accounting Principles for additional information.
Items reclassified out of accumulated other comprehensive income (loss) |
The following table summarizes reclassifications out of accumulated other comprehensive loss:
|  | Millions of Dollars
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Defined benefit plans | $ | 17 |  | 26 |  | 155 |  | 116
The above amounts are included in the computation of net periodic benefit cost and are presented net of tax expense of $6 million and $14 million for the three months ended September 30, 2018 and September 30, 2017, respectively, and $43 million and $61 million for the nine-month periods ended September 30, 2018 and September 30, 2017, respectively. See Note 18—Employee Benefit Plans, for additional information.

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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=114867106&loc=SL7669686-108580 + Details
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