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Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2020 and 2019 were as follows:
 
 
Pension and Other Post-Retirement Benefits
Liability,
Net of Tax
 
Cumulative
Foreign
Currency
Exchange,
Net of Tax
 
Total
Balances at December 31, 2019
 
$
3

 
$
(77
)
 
$
(74
)
Other comprehensive income before reclassifications
 
—

 
5

 
5

Net other comprehensive income attributable to Westlake Chemical Corporation
 
—

 
5

 
5

Balances at September 30, 2020
 
$
3

 
$
(72
)
 
$
(69
)
 
 
 
 
 
 
 
Balances at December 31, 2018
 
$
27

 
$
(89
)
 
$
(62
)
Other comprehensive loss before reclassifications
 
—

 
(4
)
 
(4
)
Net other comprehensive loss attributable to Westlake Chemical Corporation
 
—

 
(4
)
 
(4
)
Balances at September 30, 2019
 
$
27

 
$
(93
)
 
$
(66
)