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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
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

 
Hedging

 
Accumulated
Other
Comprehensive Loss

 
 
 
 
 
 
 
 
December 31, 2016
$
(713
)
 
(285
)
 
3

 
(995
)
Other comprehensive income before reclassifications
3

 
259

 
4

 
266

Amounts reclassified from accumulated other comprehensive loss*
 
 
 
 
 
 
 
Defined benefit plans**
 
 
 
 
 
 
 
Amortization of net actuarial loss, prior service cost (credit) and settlements
112

 
—

 
—

 
112

Net current period other comprehensive income
115

 
259

 
4

 
378

December 31, 2017
(598
)
 
(26
)
 
7

 
(617
)
Other comprehensive income (loss) before reclassifications
14

 
(192
)
 
4

 
(174
)
Amounts reclassified from accumulated other comprehensive loss
 
 
 
 
 
 
 
Defined benefit plans**
 
 
 
 
 
 
 
Amortization of net actuarial loss, prior service credit and settlements
112

 
—

 
—

 
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 settlements
49

 
—

 
—

 
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
)

* There were no significant reclassifications related to foreign currency translation or hedging in the year ended December 31, 2017.
** 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. See Note 2—Changes in Accounting Principles, for additional information on our adoption of this ASU.