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Cash and Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Available-for-sale and trading securities          
Amortized Cost $ 104serv_MarketableSecuritiesAmortizedCost   $ 138serv_MarketableSecuritiesAmortizedCost $ 138serv_MarketableSecuritiesAmortizedCost  
Gross Unrealized Gains 9us-gaap_UnrealizedGainOnSecurities   12us-gaap_UnrealizedGainOnSecurities 10us-gaap_UnrealizedGainOnSecurities  
Gross Unrealized Losses (1)us-gaap_UnrealizedLossOnSecurities   (1)us-gaap_UnrealizedLossOnSecurities (2)us-gaap_UnrealizedLossOnSecurities  
Fair Value 112us-gaap_MarketableSecurities   149us-gaap_MarketableSecurities 146us-gaap_MarketableSecurities  
Portion of unrealized losses in loss position for more than one year 1serv_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossAccumulatedInInvestments   0serv_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossAccumulatedInInvestments 2serv_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossAccumulatedInInvestments  
Aggregate fair value of investments with unrealized losses 17us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue   30us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 13us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue  
Summary of gross realized gains and gross realized losses resulting from sales of available-for-sale securities          
Proceeds from sale of securities 43us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 8us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 23us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 23us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities 45us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Gross realized gains, pre-tax 5us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 1us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 2us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 2us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 6us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized gains, net of tax 3serv_AvailableForSaleSecuritiesGrossRealizedGainsNetOfTax 1serv_AvailableForSaleSecuritiesGrossRealizedGainsNetOfTax 1serv_AvailableForSaleSecuritiesGrossRealizedGainsNetOfTax 1serv_AvailableForSaleSecuritiesGrossRealizedGainsNetOfTax 4serv_AvailableForSaleSecuritiesGrossRealizedGainsNetOfTax
Gross realized losses, pre-tax (1)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses   (1)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses    
Debt securities          
Available-for-sale and trading securities          
Amortized Cost 70serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
  97serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
99serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Gross Unrealized Gains 1us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
  3us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
6us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Gross Unrealized Losses     (1)us-gaap_UnrealizedLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
   
Fair Value 71us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
  99us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
105us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
 
Equity securities          
Available-for-sale and trading securities          
Amortized Cost 34serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  41serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
39serv_MarketableSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Gross Unrealized Gains 8us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  9us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
4us-gaap_UnrealizedGainOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Gross Unrealized Losses (1)us-gaap_UnrealizedLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
    (2)us-gaap_UnrealizedLossOnSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Fair Value $ 41us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  $ 50us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ 41us-gaap_MarketableSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember