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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
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 PlansForeign Currency TranslationHedgingAccumulated 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$(472) (228) 8  (692) 
Other comprehensive income (loss) before reclassifications4  (6) (7) (9) 
Amounts reclassified from accumulated other comprehensive loss
Defined benefit plans*
Amortization of net actuarial loss, prior service credit and settlements
26  —  —  26  
Foreign currency translation—  —  —  —  
Hedging—  —  (3) (3) 
Net current period other comprehensive income (loss)30  (6) (10) 14  
Income taxes reclassified to retained earnings**(93) 2  2  (89) 
June 30, 2019$(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.