Reportable Segment Information (Segment Net Sales and Income) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 3,015		$ 4,024	$ 6,392	$ 7,648
Segment income (loss)	396		660	849	1,175
Corporate	(50)		(44)	(110)	(91)
Interest expense, net of interest income	(36)		(28)	(59)	(53)
Business restructuring-related costs, net	173		182	186	185
Debt extinguishment charge	7		0	(7)	0
Environmental remediation charges	(4)		(30)	(12)	(40)
Increase in allowance for doubtful accounts related to COVID-19	0	$ 30	0	30	0
Costs associated with accounting investigations	0		(3)	0	(7)
Acquisition-related costs	0		(10)	0	(17)
Income before income taxes	126		363	445	782
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,069		2,430	4,077	4,538
Segment income (loss)	362		425	634	722
Industrial Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	946		1,594	2,315	3,110
Segment income (loss)	$ 34		$ 235	$ 215	$ 453