Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 728	$ 753
Accounts receivable, net	1,036	1,037
Inventories	936	1,014
Prepaid expenses and other current assets	42	38
Total current assets	2,742	2,842
Property, plant and equipment, net	6,912	6,595
Operating lease right-of-use assets	443	0
Goodwill	1,074	1,002
Other intangible assets, net	187	134
Equity Method Investments	1,112	253
Other assets, net	268	251
Total assets	13,261	11,602
Current liabilities
Accounts payable	473	507
Accrued and other liabilities	768	676
Total current liabilities	1,241	1,183
Long-term debt, net	3,445	2,668
Deferred income taxes	1,255	1,159
Pension and other post-retirement benefits	360	337
Operating lease liabilities	355	0
Other liabilities	202	179
Total liabilities	6,858	5,526
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and 134,651,380 shares issued at December 31, 2019 and 2018, respectively	1	1
Common stock, held in treasury, at cost; 6,266,609 and 6,183,125 shares at December 31, 2019 and 2018, respectively	(377)	(382)
Additional paid-in capital	553	556
Retained earnings	5,757	5,477
Accumulated other comprehensive loss	(74)	(62)
Total Westlake Chemical Corporation stockholders' equity	5,860	5,590
Noncontrolling interests	543	486
Total equity	6,403	6,076
Total liabilities and equity	13,261	11,602
Customer Relationships [Member]
Current assets
Customer relationships, net	$ 523	$ 525