Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 3,571	$ 1,313
Accounts receivable, net	1,642	1,214
Inventories	1,124	918
Prepaid expenses and other current assets	98	32
Total current assets	6,435	3,477
Property, plant and equipment, net	6,992	6,920
Operating lease right-of-use assets	479	461
Goodwill	1,253	1,083
Customer relationships, net	470	444
Other intangible assets, net	198	168
Equity method investments	1,010	1,059
Other assets, net	271	223
Total assets	17,108	13,835
Current liabilities
Accounts payable	718	536
Accrued and other liabilities	912	821
Current portion of long-term debt, net	268	0
Total current liabilities	1,898	1,357
Long-term debt, net	4,929	3,566
Deferred income taxes	1,445	1,368
Pension and other post-retirement benefits	362	391
Operating lease liabilities	392	376
Other liabilities	213	199
Total liabilities	9,239	7,257
Commitments and contingencies (Note 14)
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 September 30, 2021 and December 31, 2020, respectively	1	1
Common stock, held in treasury, at cost; 6,830,317 and 6,821,174 shares at September 30, 2021 and December 31, 2020, respectively	(406)	(401)
Additional paid-in capital	576	569
Retained earnings	7,202	5,938
Accumulated other comprehensive loss	(75)	(64)
Total Westlake Chemical Corporation stockholders' equity	7,298	6,043
Noncontrolling interests	571	535
Total equity	7,869	6,578
Total liabilities and equity	$ 17,108	$ 13,835