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Available-for-Sale Securities (Schedule of Available-for-Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 84us-gaap_AvailableForSaleSecurities [1] $ 100us-gaap_AvailableForSaleSecurities [1]
Available-for-sale Securities, Current 35us-gaap_AvailableForSaleSecuritiesCurrent 93us-gaap_AvailableForSaleSecuritiesCurrent
Available-for-sale Securities, Noncurrent 49us-gaap_AvailableForSaleSecuritiesNoncurrent 7us-gaap_AvailableForSaleSecuritiesNoncurrent
Commercial Paper    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 9us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember		 4us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialPaperMember
Treasury bills    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 0us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember		 85us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
International bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 1us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 1us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 4us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember		 3us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
Available-for-sale Securities, Noncurrent 7us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember		 5us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateBondSecuritiesMember
U.S. agency bonds    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 10us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 0us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale Securities, Noncurrent 26us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 2us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
U.S. agency mortgage-backed securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Current 11us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 0us-gaap_AvailableForSaleSecuritiesCurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale Securities, Noncurrent $ 16us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 $ 0us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
[1] We invest in marketable securities, which are classified as available-for-sale and are carried at fair value in the condensed consolidated balance sheets. Observable Level 2 inputs such as quoted prices for similar securities, interest rate spreads, yield curves and credit risk are used to determine the fair value. See Note 5 for additional information regarding available-for-sale securities.