Reportable Business Segment Information (Segment Net Sales and Income) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating Income (Loss) [Abstract]
Net sales	$ 4,082		$ 4,032	$ 11,961	$ 12,116
Cost of sales, exclusive of depreciation and amortization	2,426		2,381	7,000	7,036
Selling, general and administrative	824		848	2,534	2,556
Segment income (loss)	689		689	2,039	2,151
Goodwill, impairment loss	(24)
Legacy environmental remediation charges	(1)	$ (16)	1	(17)	(23)
Income before income taxes	556		578	1,656	1,771
Expenditures for property, plant and equipment (including business acquisitions)	147		148	477	542
Equity in undistributed earnings (losses) of subsidiaries	5		5	15	15
Impairment related net loss attributable to noncontrolling interest	12
Operating Segments
Operating Income (Loss) [Abstract]
Net sales	4,082		4,032	11,961	12,116
Segment income (loss)	689		689	2,039	2,151
Corporate / Non-Segment Items
Operating Income (Loss) [Abstract]
Depreciation and amortization	(14)		(10)	(44)	(39)
Corporate / non-segment unallocated, exclusive of depreciation and amortization	(59)		(72)	(213)	(215)
Interest expense, net of interest income	(23)		(19)	(54)	(49)
Business restructuring-related costs, net	(11)		0	(40)	(15)
Goodwill, impairment loss	(24)		0	(24)	0
Portfolio optimization	(2)		(10)	2	(42)
Insurance recovery	0		0	6	0
Legacy environmental remediation charges	0		0	(16)	(20)
Expenditures for property, plant and equipment (including business acquisitions)	37		42	115	143
Equity in undistributed earnings (losses) of subsidiaries	3		3	9	8
Global Architectural Coatings
Operating Income (Loss) [Abstract]
Net sales	1,012		1,004	2,887	3,040
Global Architectural Coatings | Operating Segments
Operating Income (Loss) [Abstract]
Net sales	1,012		1,004	2,887	3,040
Cost of sales, exclusive of depreciation and amortization	492		494	1,419	1,465
Selling, general and administrative	290		289	872	899
Depreciation and amortization	29		26	82	78
Other	17		12	52	38
Segment income (loss)	184		183	462	560
Expenditures for property, plant and equipment (including business acquisitions)	25		22	82	114
Equity in undistributed earnings (losses) of subsidiaries	0		1	1	2
Performance Coatings
Operating Income (Loss) [Abstract]
Net sales	1,414		1,373	4,191	3,975
Performance Coatings | Operating Segments
Operating Income (Loss) [Abstract]
Net sales	1,414		1,373	4,191	3,975
Cost of sales, exclusive of depreciation and amortization	821		755	2,315	2,156
Selling, general and administrative	264		258	795	764
Depreciation and amortization	35		31	101	99
Other	22		23	78	73
Segment income (loss)	272		306	902	883
Expenditures for property, plant and equipment (including business acquisitions)	41		32	119	126
Equity in undistributed earnings (losses) of subsidiaries	1		1	4	4
Industrial Coatings
Operating Income (Loss) [Abstract]
Net sales	1,656		1,655	4,883	5,101
Industrial Coatings | Operating Segments
Operating Income (Loss) [Abstract]
Net sales	1,656		1,655
Cost of sales, exclusive of depreciation and amortization	1,113		1,132	3,265	3,415
Selling, general and administrative	198		207	603	629
Depreciation and amortization	48		52	144	157
Other	64		64	196	192
Segment income (loss)	233		200	675	708
Expenditures for property, plant and equipment (including business acquisitions)	44		52	161	159
Equity in undistributed earnings (losses) of subsidiaries	$ 1		$ 0	$ 1	$ 1