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Accumulated Other Comprehensive Income (Loss) (Notes)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) 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
)