Weighted-average period of amortization for finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Acquisitions and Divestitures - Narrative (Details) € in Millions, $ in Millions									3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 01, 2026 USD ($)	Jul. 01, 2026 EUR (€)	May 26, 2026 USD ($)	Dec. 02, 2025 USD ($)	Jul. 23, 2025 USD ($)	Apr. 01, 2025 USD ($)	Feb. 07, 2025 USD ($)	Jan. 31, 2025 USD ($) employee	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Business Combination [Line Items]
Payments to acquire productive assets												$ 179	$ 169
Payments for asset acquisition at closing												2	37
Loss on sale of businesses									$ (16)		$ 0	(12)	(10)
Proceeds from sale of businesses, net of cash disposed												59	50
Goodwill									$ 8,256	$ 8,332		8,256			$ 8,332
Acquisition of business, net of cash acquired												1	$ 7
Simply Clean Air and Water, Inc
Business Combination [Line Items]
Payments to acquire businesses, gross								$ 7
Number of employees \| employee								20
Pac Machine
Business Combination [Line Items]
Payments to acquire businesses, gross				$ 66
Goodwill				32
Acquisition of business, net of cash acquired				62
Payments to acquire business, gross, at closing				54
Payments to acquire business, net of cash acquired, at closing				50
Consideration transferred, settlement of liability				3
Business combination, remaining consideration to be paid				$ 9
Business combination, remaining consideration to be paid, period				4 years
Intangible assets acquired excluding goodwill				$ 27
EMX Holdings, Inc.
Business Combination [Line Items]
Percentage of ownership interest acquired					100.00%
Consideration transferred					$ 106
Goodwill					76
Intangible assets acquired excluding goodwill					$ 34
March 2026 Acquisition \| Subsequent Event
Business Combination [Line Items]
Percentage of ownership interest acquired	100.00%	100.00%
Consideration transferred	$ 216	€ 190
WaterFleet Intermediate Holdings, Inc. \| Forecast
Business Combination [Line Items]
Percentage of ownership interest acquired														100.00%
Consideration transferred														$ 200
Disposed of by Sale \| International Metering Business
Business Combination [Line Items]
Loss on sale of businesses			$ (37)									(14)			23
Proceeds from sale of businesses			63
Proceeds from sale of businesses, net of cash disposed			52
Consideration received on sale of business			80
Consideration received on sale of business, net			75
Consideration, note receivable			10
Consideration, post-closing working capital adjustment			$ 7
Disposed of by Sale \| Evoqua Magneto
Business Combination [Line Items]
Loss on sale of businesses											$ (10)	(8)
Proceeds from sale of businesses							$ 61
Proceeds from sale of businesses, net of cash disposed							$ 48
Working capital adjustment										$ (2)
Disposed of by Sale \| Other Divestitures
Business Combination [Line Items]
Loss on sale of businesses												2
Proceeds from sale of businesses												$ 7			$ 2
Vacom Systems LLC
Business Combination [Line Items]
Payments to acquire productive assets						$ 42
Payments for asset acquisition at closing						$ 37
Royalty on revenue, percentage						5.00%
Royalty on revenue, period after acquisition						5 years
Royalty on revenue, maximum						$ 25
Vacom Systems LLC \| Developed Technology Rights
Business Combination [Line Items]
Finite-lived intangible assets acquired						$ 49
Useful life (in years)						15 years