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Reportable Business Segment Information (Segment Net Sales and Income) (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 4,372			$ 3,685		$ 12,612	$ 10,077
Segment income (loss)	548			679		1,823	1,528
Corporate	(45)			(55)		(149)	(165)
Interest expense, net of interest income	(23)			(30)		(72)	(89)
Acquisition-related costs	(43)			0		(81)	0
Environmental remediation charges	0	$ (10)	$ (16)	0		(26)	(12)
Impairment charge	(21)			0		(21)	0
Expenses incurred due to a natural disaster	0			(8)		(17)	(8)
Change in allowance for doubtful accounts related to COVID-19	0	$ (14)		0	$ 30	14	(30)
Income from legal settlements	0			0		22	0
Business restructuring-related costs, net	25			(14)		40	(200)
Debt extinguishment charge	0			0		0	(7)
Income before income taxes	441			572		1,533	1,017
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,758			2,251		7,826	6,328
Segment income (loss)	408			426		1,248	1,060
Industrial Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,614			1,434		4,786	3,749
Segment income (loss)	$ 140			$ 253		$ 575	$ 468

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