Goodwill and Other Intangible Assets (Goodwill Rollforward) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Changes in the carrying value of goodwill by operating segment
Beginning balance	$ 7,587
Foreign currency and other	(78)
Ending balance	7,509
Goodwill Adjustment Due To Segment Reallocation
Changes in the carrying value of goodwill by operating segment
Reallocation		$ 0
Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	7,587
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Beginning balance	2,434
Foreign currency and other	(32)
Ending balance	2,115
Water Infrastructure | Goodwill Adjustment Due To Segment Reallocation
Changes in the carrying value of goodwill by operating segment
Reallocation		(287)
Water Infrastructure | Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	2,147
Applied Water
Changes in the carrying value of goodwill by operating segment
Beginning balance	895
Foreign currency and other	(7)
Ending balance	888
Applied Water | Goodwill Adjustment Due To Segment Reallocation
Changes in the carrying value of goodwill by operating segment
Reallocation		0
Applied Water | Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	895
Measurement and Control Solutions
Changes in the carrying value of goodwill by operating segment
Beginning balance	1,739
Foreign currency and other	(17)
Ending balance	1,658
Measurement and Control Solutions | Goodwill Adjustment Due To Segment Reallocation
Changes in the carrying value of goodwill by operating segment
Reallocation		(64)
Measurement and Control Solutions | Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	1,675
Water Solutions and Services
Changes in the carrying value of goodwill by operating segment
Beginning balance	2,519
Foreign currency and other	(22)
Ending balance	2,848
Water Solutions and Services | Goodwill Adjustment Due To Segment Reallocation
Changes in the carrying value of goodwill by operating segment
Reallocation		$ 351
Water Solutions and Services | Goodwill Adjustment Due To Segment Reallocation, Adjusted Balance
Changes in the carrying value of goodwill by operating segment
Beginning balance	$ 2,870