Goodwill and Other Intangible Assets - Rollforward of Goodwill (Details) $ in Millions	9 Months Ended
Sep. 30, 2026 USD ($)
Changes in the carrying value of goodwill by operating segment
Beginning Balance	$ 8,332
Acquisitions	260
Divestitures	(9)
Foreign currency and other	(59)
Ending Balance	8,524
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Beginning Balance	2,264
Acquisitions	(2)
Divestitures	(2)
Foreign currency and other	(14)
Ending Balance	2,246
Applied Water
Changes in the carrying value of goodwill by operating segment
Beginning Balance	905
Acquisitions	0
Divestitures	(2)
Foreign currency and other	(6)
Ending Balance	897
Measurement and Control Solutions
Changes in the carrying value of goodwill by operating segment
Beginning Balance	2,270
Acquisitions	155
Divestitures	(5)
Foreign currency and other	(34)
Ending Balance	2,386
Water Solutions and Services
Changes in the carrying value of goodwill by operating segment
Beginning Balance	2,893
Acquisitions	107
Divestitures	0
Foreign currency and other	(5)
Ending Balance	$ 2,995

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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