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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
Changes in the balances of each component of accumulated other comprehensive loss were as follows:

 Millions of Dollars
 Defined
Benefit
Plans		Foreign
Currency
Translation		HedgingAccumulated
Other
Comprehensive Loss
December 31, 2017$(598)(26)7 (617)
Other comprehensive income (loss) before reclassifications14 (192)4 (174)
Amounts reclassified from accumulated other comprehensive loss
Defined benefit plans*
Amortization of net actuarial loss, prior service credit and settlements112 — — 112 
Foreign currency translation— (10)— (10)
Hedging— — (3)(3)
Net current period other comprehensive income (loss)126 (202)1 (75)
December 31, 2018(472)(228)8 (692)
Other comprehensive income (loss) before reclassifications(140)95 (5)(50)
Amounts reclassified from accumulated other comprehensive loss
Defined benefit plans*
Amortization of net actuarial loss, prior service credit and settlements49 — — 49 
Foreign currency translation— — — — 
Hedging— — (6)(6)
Net current period other comprehensive income (loss)(91)95 (11)(7)
Income taxes reclassified to retained earnings**(93)2 2 (89)
December 31, 2019(656)(131)(1)(788)
Other comprehensive income (loss) before reclassifications(262)151 1 (110)
Amounts reclassified from accumulated other comprehensive loss
Defined benefit plans*
Amortization of net actuarial loss, prior service credit and settlements109 — — 109 
Foreign currency translation— — — — 
Hedging— — (5)(5)
Net current period other comprehensive income (loss)(153)151 (4)(6)
Other— 5 — 5 
December 31, 2020$(809)25 (5)(789)
* Included in the computation of net periodic benefit cost. See Note 19—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.