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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of Changes in and Reclassifications Out of Accumulated Other Comprehensive Income (Loss) by Component | Changes in the balances of each component of accumulated other comprehensive loss were as follows:
| Millions of Dollars |  |  |  |  |  |
| Defined Benefit Plans |  | Foreign Currency Translation |  | Hedging |  | Accumulated Other Comprehensive Loss
December 31, 2019 | $ | (656) |  |  | (131) |  |  | (1) |  |  | (788) |
Other comprehensive loss before reclassifications | (223) |  |  | (195) |  |  | (8) |  |  | (426) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |
Defined benefit plans* |  |  |  |  |  |  |
Amortization of net actuarial loss, prior service credit and settlements | 60 |  |  | — |  |  | — |  |  | 60 |
Foreign currency translation | — |  |  | — |  |  | — |  |  | — |
Hedging | — |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive loss | (163) |  |  | (195) |  |  | (7) |  |  | (365) |
Other | — |  |  | 5 |  |  | — |  |  | 5 |
June 30, 2020 | $ | (819) |  |  | (321) |  |  | (8) |  |  | (1,148) |
December 31, 2018 | $ | (472) |  |  | (228) |  |  | 8 |  |  | (692) |
Other comprehensive income (loss) before reclassifications | 4 |  |  | (6) |  |  | (7) |  |  | (9) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  |  |  |
Defined benefit plans* |  |  |  |  |  |  |
Amortization of net actuarial loss, prior service credit and settlements | 26 |  |  | — |  |  | — |  |  | 26 |
Foreign currency translation | — |  |  | — |  |  | — |  |  | — |
Hedging | — |  |  | — |  |  | (3) |  |  | (3) |
Net current period other comprehensive income (loss) | 30 |  |  | (6) |  |  | (10) |  |  | 14 |
Income taxes reclassified to retained earnings** | (93) |  |  | 2 |  |  | 2 |  |  | (89) |
June 30, 2019 | $ | (535) |  |  | (232) |  |  | — |  |  | (767) |
* Included in the computation of net periodic benefit cost. See Note 14—Pension and Postretirement Plans, for additional information. |  |  |  |  |  |  |
** As of January 1, 2019, stranded income taxes related to the enactment of the Tax Act in December 2017 were reclassified to retained earnings upon adoption of ASU No. 2018-02. |  |  |  |  |  |  |

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