Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Operating activities:
Net income attributable to the controlling and noncontrolling interests	$ 23	$ 385
Adjustments to reconcile net income to cash from operations:
Depreciation and amortization	145	129
Pension income	(7)	(9)
Environmental remediation charges	0	16
Impairment and other related charges	290	0
Stock-based compensation expense	6	17
Deferred income taxes	(36)	(7)
Cash used for restructuring actions	(32)	(26)
Change in certain asset and liability accounts (net of acquisitions):
Receivables	(530)	(354)
Inventories	(325)	(189)
Other current assets	(88)	(37)
Accounts payable and accrued liabilities	326	110
Taxes and interest payable	(54)	22
Noncurrent assets and liabilities, net	(30)	(32)
Other	8	(48)
Cash used for operating activities	(304)	(23)
Investing activities:
Capital expenditures	(194)	(80)
Business acquisitions, net of cash balances acquired	(9)	(356)
Other	20	12
Cash used for investing activities	(183)	(424)
Financing activities:
Proceeds from commercial paper and short-term debt, net of payments	586	300
Repayment of term loan	0	(400)	$ (1,100)
Proceeds from the issuance of debt, net of discounts and fees	55	692
Purchase of treasury stock	(40)
Issuance of treasury stock	6	20
Dividends paid on PPG common stock	(139)	(128)
Payments related to tax withholding on stock-based compensation awards	(12)	(11)
Other	(13)	(4)
Cash from financing activities	443	469
Effect of currency exchange rate changes on cash and cash equivalents	(1)	(40)
Net decrease in cash and cash equivalents	(45)	(18)
Cash and cash equivalents, beginning of period	1,005	1,826
Cash and cash equivalents, end of period	960	1,808	$ 1,826
Interest paid, net of amount capitalized	52	52
Taxes paid, net of refunds	114	97
Capital Expenditures Incurred but Not yet Paid	$ 31	$ 31