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Accumulated Other Comprehensive Loss
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Loss
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
2

 
24

 
2

 
28

Amounts reclassified from accumulated other comprehensive loss*
 
 
 
 
 
 
 
Amortization of defined benefit plan items**
 
 
 
 
 
 
 
Actuarial loss and settlements
15

 
—

 
—

 
15

Net current period other comprehensive income
17

 
24

 
2

 
43

March 31, 2017
$
(696
)
 
(261
)
 
5

 
(952
)
 
 
 
 
 
 
 
 
December 31, 2017
$
(598
)
 
(26
)
 
7

 
(617
)
Other comprehensive income before reclassifications
5

 
88

 
4

 
97

Amounts reclassified from accumulated other comprehensive loss*
 
 
 
 
 
 


Amortization of defined benefit plan items**
 
 
 
 
 
 
 
Actuarial loss and settlements
16

 
—

 
—

 
16

Net current period other comprehensive income
21

 
88

 
4

 
113

March 31, 2018
$
(577
)
 
62

 
11

 
(504
)
* There were no significant reclassifications related to foreign currency translation or hedging.
** Included in the computation of net periodic benefit cost. See Note 14—Pension and Postretirement Plans, for additional information.