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Other Non-Operating Income, Net Other Non-Operating Income, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Interest income $ 2us-gaap_InvestmentIncomeInterestAndDividend $ 3us-gaap_InvestmentIncomeInterestAndDividend $ 4us-gaap_InvestmentIncomeInterestAndDividend
Income from joint ventures 2us-gaap_IncomeLossFromEquityMethodInvestments 2us-gaap_IncomeLossFromEquityMethodInvestments 4us-gaap_IncomeLossFromEquityMethodInvestments
Other income (expense) - net (3)xyl_OtherIncomeExpenseNet [1] (15)xyl_OtherIncomeExpenseNet [1] (8)xyl_OtherIncomeExpenseNet [1]
Total other non-operating income (expense), net 1us-gaap_OtherNonoperatingIncomeExpense (10)us-gaap_OtherNonoperatingIncomeExpense 0us-gaap_OtherNonoperatingIncomeExpense
ITT [Member]      
Related Party Transaction [Line Items]      
Amount owed to related party pursuant to tax agreement   $ 10xyl_IncomeTaxesAmountPaidtoRelatedPartyPursuanttoAgreement
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xyl_IttMember		  
[1] (a) 2013 includes $10 million of expense incurred under the tax matters agreement with ITT. Refer to Note 7 "Income Taxes" for additional information regard the tax matters agreement.