Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
Changes in the carrying value of goodwill by operating segment
Beginning balance	$ 8,332
Acquisitions	(2)
Divestitures	(2)
Reclassification to assets held for sale	(2)
Foreign currency and other	(70)
Ending balance	8,256
Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	8,332
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Acquisitions	0
Divestitures	(1)
Reclassification to assets held for sale	0
Foreign currency and other	(22)
Ending balance	2,241
Water Infrastructure \| Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	2,264
Applied Water
Changes in the carrying value of goodwill by operating segment
Acquisitions	0
Divestitures	0
Reclassification to assets held for sale	(2)
Foreign currency and other	(6)
Ending balance	897
Applied Water \| Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	905
Measurement and Control Solutions
Changes in the carrying value of goodwill by operating segment
Acquisitions	0
Divestitures	(1)
Reclassification to assets held for sale	0
Foreign currency and other	(36)
Ending balance	2,233
Measurement and Control Solutions \| Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	2,270
Water Solutions and Services
Changes in the carrying value of goodwill by operating segment
Acquisitions	(2)
Divestitures	0
Reclassification to assets held for sale	0
Foreign currency and other	(6)
Ending balance	2,885
Water Solutions and Services \| Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	$ 2,893

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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