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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
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 for the three and nine months ended September 30, 2018 and 2017:
Details about Accumulated Other
   Comprehensive Income (Loss)
   Components
 
Location of Reclassification
(Income (Expense)) in
Consolidated Statements
of Operations
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Amortization of pension and other post-retirement net loss
 
(1)
 
$
—

 
$
(1
)
 
$
—

 
$
(2
)
Pension settlement gain
 
(1)
 
14

 
—

 
14

 
—

Income tax provision on pension and other post-retirement benefits liability
 
Benefits from (provision for) income taxes
 
(3
)
 
1

 
(3
)
 
1

Total reclassifications for the
   period
 
 
 
$
11

 
$
—

 
$
11

 
$
(1
)
_____________
(1)
These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost and reflected in other income, net in the consolidated statements of operations. See Note 7 for additional information on the pension settlement gain.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2018 and 2017 were as follows:
 
 
Benefits
Liability,
Net of Tax
 
Cumulative
Foreign
Currency
Exchange,
Net of Tax
 
Total
Balances at December 31, 2016
 
$
29

 
$
(150
)
 
$
(121
)
Other comprehensive income before reclassifications
 
—

 
107

 
107

Amounts reclassified from accumulated other
comprehensive income (loss)
 
1

 
—

 
1

Net other comprehensive income attributable
to Westlake Chemical Corporation
 
1

 
107

 
108

Balances at September 30, 2017
 
$
30

 
$
(43
)
 
$
(13
)
 
 
 
 
 
 
 
Balances at December 31, 2017
 
$
43

 
$
(36
)
 
$
7

Other comprehensive income (loss) before reclassifications
 
20

 
(40
)
 
(20
)
Amounts reclassified from accumulated other
   comprehensive income (loss)
 
(11
)
 
—

 
(11
)
Net other comprehensive income (loss) attributable
to Westlake Chemical Corporation
 
9

 
(40
)
 
(31
)
Balances at September 30, 2018
 
$
52

 
$
(76
)
 
$
(24
)