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Goodwill and Other Intangible Assets (Goodwill Rollforward) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2018	$ 2,768
Divested/Acquired	277
Foreign currency and other	37
Balance as of March 31, 2018	3,082
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2018	667
Divested/Acquired	0
Foreign currency and other	9
Balance as of March 31, 2018	676
Applied Water
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2018	526
Divested/Acquired	0
Foreign currency and other	7
Balance as of March 31, 2018	533
Measurement & Control Solutions
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2018	1,575
Divested/Acquired	277
Foreign currency and other	21
Balance as of March 31, 2018	$ 1,873

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

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

+ References

No definition available.

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- Definition

Goodwill, Acquired (Divested) During Period

+ References

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