Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Income from continuing operations	$ 1,206	$ 810
Adjustments to reconcile net income to cash from operations:
Depreciation and amortization	408	421
Pension settlement charge	190	0
Impairment and other related charges, net	0	230
Stock-based compensation expense	42	27
Deferred income taxes	(131)	(129)
Cash used for restructuring actions	(44)	(63)
Change in certain asset and liability accounts (net of acquisitions):
Receivables	(358)	(644)
Inventories	70	(458)
Other current assets	(70)	(68)
Accounts payable and accrued liabilities	72	340
Taxes and interest payable	92	67
Noncurrent assets and liabilities, net	(133)	(41)
Other	169	(116)
Cash from operating activities	1,513	376
Investing activities:
Capital expenditures	(381)	(368)
Business acquisitions, net of cash balances acquired	(108)	(43)
Proceeds from asset sales	25	116
Proceeds from the settlement of cross currency swap contracts	60	27
Other	5	22
Cash used for investing activities	(399)	(246)
Financing activities:
Net payments on commercial paper and short-term debt	0	(439)
Net change in borrowing with maturities of three months or less	(16)	8
Proceeds from Term Loan	550	0
Repayment of Term Loan	(800)	(100)
Proceeds from the issuance of debt, net of discounts and fees	0	1,116
Repayment of long-term debt	300	0
Purchase of treasury stock	0	(190)
Dividends paid on PPG common stock	(445)	(424)
Other	6	(27)
Cash used for financing activities	(1,005)	(56)
Effect of currency exchange rate changes on cash and cash equivalents	10	(50)
Net increase in cash and cash equivalents	119	24
Cash and cash equivalents, beginning of period	1,099	1,005
Cash and cash equivalents, end of period	1,218	1,029
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Interest paid, net of amount capitalized	181	119
Taxes paid, net of refunds	378	343
Capital expenditures accrued within Accounts payable and accrued liabilities at period-end	$ 75	$ 76