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Restructuring Charges (Accrual Rollfoward) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restructuring Reserve [Roll Forward]
Restructuring accruals	$ 9	$ 1
Severance and other	5	0
Cash payments	4	0
Other	0	1
Restructuring accruals	10	0
Water Infrastructure
Restructuring Reserve [Roll Forward]
Severance and other	5	0
Restructuring accruals	7	0
Applied Water
Restructuring Reserve [Roll Forward]
Severance and other	0	0
Restructuring accruals	3	0
Corporate and other
Restructuring Reserve [Roll Forward]
Severance and other	0	0
Restructuring accruals	$ 0	$ 0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost, excluding adjustments for costs incurred during the period, costs settled during the period, and foreign currency translation adjustments.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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