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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Changes in accumulated other comprehensive income (loss) by component for the six months ended June 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
 
—

 
66

 
66

Amounts reclassified from accumulated other
comprehensive income
 
1

 
—

 
1

Net other comprehensive income attributable
to Westlake Chemical Corporation
 
1

 
66

 
67

Balances at June 30, 2017
 
$
30

 
$
(84
)
 
$
(54
)
 
 
 
 
 
 
 
Balances at December 31, 2017
 
$
43

 
$
(36
)
 
$
7

Other comprehensive loss before reclassifications
 
—

 
(40
)
 
(40
)
Net other comprehensive loss attributable
to Westlake Chemical Corporation
 
—

 
(40
)
 
(40
)
Balances at June 30, 2018
 
$
43

 
$
(76
)
 
$
(33
)