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Derivative Financial Instruments Derivative Financial Instruments - Fair Value of Foreign Exchange Contracts (Details) (Designated as Hedging Instrument, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Total fair value $ (12)xyl_ForeignCurrencyContractFairValueDisclosure $ 1xyl_ForeignCurrencyContractFairValueDisclosure
Other Assets
    
Derivatives, Fair Value [Line Items]    
Other current assets 1us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Other Liabilities
    
Derivatives, Fair Value [Line Items]    
Other current liabilities $ (13)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember