Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net income	$ 157	$ 82
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	190	171
Stock-based compensation expense	6	7
Loss from disposition and write-off of property, plant and equipment	5	20
Deferred income taxes	126	15
Other losses (gains), net	(2)	9
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	(240)	(41)
Inventories	(8)	19
Prepaid expenses and other current assets	7	4
Accounts payable	(2)	(7)
Accrued and other liabilities	(146)	(110)
Other, net	(32)	(22)
Net cash provided by operating activities	61	147
Cash flows from investing activities
Acquisition of businesses, net of cash acquired	0	(236)
Additions to property, plant and equipment	(164)	(203)
Additions to investments in unconsolidated subsidiaries	0	(42)
Return of investment from an equity investee	39	0
Other, net	(7)	6
Net cash used for investing activities	(132)	(475)
Cash flows from financing activities
Dividends paid	(34)	(33)
Distributions to noncontrolling interests	(10)	(8)
Net proceeds from issuance of Westlake Chemical Partners LP common units	0	63
Proceeds from drawdown of revolver	1,000	0
Repayment of notes payable	(27)	(4)
Repurchase of common stock for treasury	(54)	0
Other	8	3
Net cash provided by financing activities	883	21
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(3)	(1)
Net increase (decrease) in cash, cash equivalents and restricted cash	809	(308)
Cash, cash equivalents and restricted cash at beginning of period	750	775
Cash, cash equivalents and restricted cash at end of period	$ 1,559	$ 467