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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component were as follows:
 
 
Benefits
Liability,
Net of Tax
 
Cumulative
Foreign
Currency
Exchange
 
Net Unrealized
Holding Gains
on Investments,
Net of Tax
 
Total
Balances at December 31, 2015
 
$
(8
)
 
$
(116
)
 
$
(5
)
 
$
(129
)
Other comprehensive income (loss) before
   reclassifications
 
36

 
(34
)
 
57

 
59

Amounts reclassified from accumulated other
   comprehensive income (loss)
 
1

 
—

 
(52
)
 
(51
)
Net other comprehensive income (loss) attributable to
   Westlake Chemical Corporation
 
37

 
(34
)
 
5

 
8

Balances at December 31, 2016
 
29

 
(150
)
 
—

 
(121
)
Other comprehensive income before
   reclassifications
 
12

 
114

 
—

 
126

Amounts reclassified from accumulated other
   comprehensive income (loss)
 
2

 
—

 
—

 
2

Net other comprehensive income attributable to
   Westlake Chemical Corporation
 
14

 
114

 
—

 
128

Balances at December 31, 2017
 
$
43

 
$
(36
)
 
$
—

 
$
7
Reclassification out of Accumulated Other Comprehensive Income
The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations:
Details about Accumulated Other
   Comprehensive Income (Loss) Components
 
Location of Reclassification
(Income (Expense)) in
Consolidated Statements
of Operations
 
Year Ended December 31,
 
2017
 
2016
 
2015
Amortization of pension and other
   post-retirement items
 
 
 
 
 
 
 
 
Net loss
 
(1)
 
$
(2
)
 
$
(2
)
 
$
(3
)
 
 
 
 
(2
)
 
(2
)
 
(3
)
 
 
Benefit from income taxes
 
—

 
1

 
1

 
 
 
 
(2
)
 
(1
)
 
(2
)
Net unrealized gains on available-for-
   sale investments
 
 
 
 
 
 
 
 
Realized gain on available-
   for-sale investments
 
Other income, net
 
—

 
54

 
4

 
 
Provision for income taxes
 
—

 
(2
)
 
(1
)
 
 
 
 
—

 
52

 
3

Total reclassifications for the period
 
 
 
$
(2
)
 
$
51

 
$
1


______________________________
(1)
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. For additional information, see Note 12.