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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Changes in the balances of each component of accumulated other comprehensive income (loss) were as follows:

 
Millions of Dollars
 
Defined
Benefit
Plans

 
Foreign
Currency
Translation

 
Hedging

 
Accumulated
Other
Comprehensive
Loss

 
 
 
 
 
 
 
 
December 31, 2014
$
(696
)
 
167

 
(2
)
 
(531
)
Other comprehensive loss before reclassification
(78
)
 
(156
)
 
—

 
(234
)
Amounts reclassified from accumulated other comprehensive loss*


 


 


 


Amortization of defined benefit plan items**


 


 


 


Actuarial losses and settlements
112

 
—

 
—

 
112

Net current period other comprehensive income (loss)
34

 
(156
)
 
—

 
(122
)
December 31, 2015
(662
)
 
11

 
(2
)
 
(653
)
Other comprehensive income (loss) before reclassifications
(112
)
 
(296
)
 
5

 
(403
)
Amounts reclassified from accumulated other comprehensive loss*


 


 


 


Amortization of defined benefit plan items**


 


 


 


Actuarial losses and settlements
61

 
—

 
—

 
61

Net current period other comprehensive income (loss)
(51
)
 
(296
)
 
5

 
(342
)
December 31, 2016
(713
)
 
(285
)
 
3

 
(995
)
Other comprehensive income before reclassifications
3

 
259

 
4

 
266

Amounts reclassified from accumulated other comprehensive loss*


 


 


 


Amortization of defined benefit plan items**


 


 


 


Actuarial losses and settlements
112

 
—

 
—

 
112

Net current period other comprehensive income
115

 
259

 
4

 
378

December 31, 2017
$
(598
)
 
(26
)
 
7

 
(617
)

* There were no significant reclassifications related to foreign currency translation or hedging.
** Included in the computation of net periodic benefit cost. See Note 19—Pension and Postretirement Plans, for additional information.