Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Income from continuing operations	$ 1,056	$ 1,441	$ 1,071
Adjustments to reconcile net income to cash from operations:
Depreciation and amortization	554	561	509
Asbestos-related claims reserve adjustment	0	(133)	0
Business restructuring, net	33	31	174
Impairment and other related charges, net	245	21	93
Stock-based compensation expense	35	57	44
Deferred income taxes	(157)	35	(47)
Cash contributions to pension plans	(11)	(10)	(17)
Cash used for restructuring actions	(85)	(77)	(126)
Change in certain asset and liability accounts (net of acquisitions):
Receivables	(268)	(63)	187
Inventories	(227)	(279)	111
Other current assets	(60)	32	49
Accounts payable and accrued liabilities	(8)	295	127
Noncurrent assets and liabilities, net	(136)	(109)	(25)
Taxes and interest payable	143	(64)	(108)
Other	(151)	(176)	88
Cash from operating activities	963	1,562	2,130
Investing activities
Capital expenditures	(518)	(371)	(304)
Business acquisitions, net of cash balances acquired	(114)	(2,137)	(1,169)
Proceeds from asset sales	117	47	0
Other	54	57	26
Cash used for investing activities	(461)	(2,404)	(1,447)
Financing activities
Proceeds from Term Loan Credit Agreement, net of fees	0	1,399	0
Repayment of Term Loan Credit Agreement	(300)	0	0
Net (payments on)/proceeds from commercial paper and short-term debt	(439)	190	150
Proceeds from Term Loan, net of fees	0	0	1,497
Repayment of Term Loan	0	(400)	(1,100)
Proceeds from revolving credit facility	0	0	800
Repayment of revolving credit facility	0	0	(800)
Proceeds from the issuance of debt, net of discounts and fees	1,116	692	415
Repayment of long-term debt	0	(847)	(500)
Repayment of acquired debt	(2)	(207)	(13)
Purchase of treasury stock	(190)	(210)	0
Dividends paid on PPG common stock	(570)	(536)	(496)
Other	(24)	12	(12)
Cash (used for)/from financing activities	(409)	93	(59)
Effect of currency exchange rate changes on cash and cash equivalents	1	(72)	6
Cash reclassified to assets held for sale	0	0	(20)
Net increase/(decrease) in cash and cash equivalents	94	(821)	610
Cash and cash equivalents, beginning of year	1,005	1,826	1,216
Cash and cash equivalents, end of year	1,099	1,005	1,826
Supplemental disclosures of cash flow information:
Interest paid, net of amount capitalized	156	140	153
Taxes paid, net of refunds	452	491	367
Capital expenditures accrued within Accounts payable and accrued liabilities at year-end	76	163	37
Purchases of treasury stock transacted but not yet settled	$ 0	$ 40	$ 0