Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income	$ 250	$ 377
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	577	525
Stock-based compensation expense	21	19
Loss from disposition and write-off of property, plant and equipment	26	32
Deferred income taxes	154	34
Other losses, net	23	4
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	(251)	(5)
Inventories	108	136
Prepaid expenses and other current assets	(8)	(7)
Accounts payable	17	(49)
Accrued and other liabilities	14	(34)
Other, net	(65)	(64)
Net cash provided by operating activities	866	968
Cash flows from investing activities
Acquisition of businesses, net of cash acquired	0	(314)
Additions to property, plant and equipment	(403)	(604)
Additions to investments in unconsolidated subsidiaries	0	(45)
Return of investment from an equity investee	44	0
Other, net	(7)	15
Net cash used for investing activities	(366)	(948)
Cash flows from financing activities
Dividends paid	(102)	(98)
Distributions to noncontrolling interests	(39)	(40)
Net proceeds from issuance of Westlake Chemical Partners LP common units	0	63
Net proceeds from debt issuance and drawdown of revolver	1,299	784
Net proceeds from (repayment of) short-term notes payable	(17)	(4)
Repayment of revolver and senior notes	(1,100)	0
Repurchase of common stock for treasury	(54)	(30)
Other, net	(1)	(6)
Net cash provided by (used for) financing activities	(14)	669
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4	(5)
Net increase (decrease) in cash, cash equivalents and restricted cash	490	684
Cash, cash equivalents and restricted cash at beginning of period	750	775
Cash, cash equivalents and restricted cash at end of period	$ 1,240	$ 1,459