Reportable Segment Information (Segment Net Sales and Income) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 3,685		$ 3,826	$ 10,077	$ 11,474
Segment income (loss)	679		586	1,528	1,761
Corporate	(55)		(43)	(165)	(134)
Interest expense, net of interest income	(30)		(23)	(89)	(76)
Business restructuring-related costs, net	14		18	200	203
Expenses incurred due to a natural disaster	(8)		0	(8)	0
Debt extinguishment charge	0		0	(7)	0
Environmental remediation charges	0		(21)	(12)	(61)
Increase in allowance for doubtful accounts related to COVID-19	0	$ 30	0	30	0
Costs associated with accounting investigations	0		0	0	(7)
Acquisition-related costs	0		0	0	(17)
Income before income taxes	572		481	1,017	1,263
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,251		2,313	6,328	6,851
Segment income (loss)	426		380	1,060	1,102
Industrial Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,434		1,513	3,749	4,623
Segment income (loss)	$ 253		$ 206	$ 468	$ 659