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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 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 loss before reclassifications
 
—

 
(32
)
 
(32
)
Net other comprehensive loss attributable to Westlake Chemical Corporation
 
—

 
(32
)
 
(32
)
Balances at March 31, 2020
 
$
3

 
$
(109
)
 
$
(106
)
 
 
 
 
 
 
 
Balances at December 31, 2018
 
$
27

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

 
(2
)
 
(2
)
Net other comprehensive loss attributable to Westlake Chemical Corporation
 
—

 
(2
)
 
(2
)
Balances at March 31, 2019
 
$
27

 
$
(91
)
 
$
(64
)