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Goodwill and Other Intangible Assets (Goodwill Rollforward) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2021	$ 2,854
Foreign currency and other	(13)
Balance as of June 30, 2021	2,841
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2021	668
Foreign currency and other	0
Balance as of June 30, 2021	668
Applied Water
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2021	529
Foreign currency and other	(5)
Balance as of June 30, 2021	524
Measurement & Control Solutions
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2021	1,657
Foreign currency and other	(8)
Balance as of June 30, 2021	$ 1,649

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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