Reportable Business Segment Information (Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Segment Reporting Information [Line Items]
Assets	$ 22,144	$ 19,433	$ 21,858
Equity method investments	156		147
Operating Segments
Segment Reporting Information [Line Items]
Assets	18,611		17,928
Equity method investments	74		66
Operating Segments | Global Architectural Coatings
Segment Reporting Information [Line Items]
Assets	6,754		6,483
Equity method investments	24		21
Operating Segments | Performance Coatings Segment
Segment Reporting Information [Line Items]
Assets	6,187		5,816
Equity method investments	28		25
Operating Segments | Industrial Coatings Segment
Segment Reporting Information [Line Items]
Assets	5,670		5,629
Equity method investments	22		20
Corporate / Non-Segment Items
Segment Reporting Information [Line Items]
Assets	3,533		3,930
Equity method investments	$ 82		$ 81