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Restructuring Charges (Number of Positions Eliminated Rollfoward) (Details) - employee	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]
Planned reductions - January 1	47	188
Additional planned reductions	102	28
Actual reductions and reversals	(45)	(133)
Planned reductions - March 31	104	83

X

- Definition

The expected number of positions to be eliminated as a result of restructuring activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

The number of positions eliminated during the period as a result of restructuring activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	xyl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restructuring and Related Cost, Planned Reductions

+ References

No definition available.

+ Details

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Namespace Prefix:	xyl_
Data Type:	xbrli:integerItemType
Balance Type:	na
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