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Cash and Cash Equivalents, Investments and Funds Held for Customers - Classification on Balance Sheets (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Jul. 31, 2014
Jan. 31, 2014
Jul. 31, 2013
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, Amortized Cost $ 482us-gaap_CashAndCashEquivalentsAtCarryingValue $ 849us-gaap_CashAndCashEquivalentsAtCarryingValue $ 625us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,009us-gaap_CashAndCashEquivalentsAtCarryingValue
Investments and funds, Fair Value 1,756us-gaap_AvailableForSaleSecurities 2,234us-gaap_AvailableForSaleSecurities    
Total cash and cash equivalents, investments, and funds held for customers, Amortized Cost 1,755intu_CashAndCashEquivalentsAndAvailableForSaleSecuritiesAmortizedCostBasis 2,233intu_CashAndCashEquivalentsAndAvailableForSaleSecuritiesAmortizedCostBasis    
Total cash and cash equivalents, investments, and funds held for customers, Fair Value 1,756intu_CashAndCashEquivalentsAndAvailableForSaleSecuritiesFairValueDisclosure 2,234intu_CashAndCashEquivalentsAndAvailableForSaleSecuritiesFairValueDisclosure    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents, Amortized Cost 482us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CashAndCashEquivalentsMember
849us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CashAndCashEquivalentsMember
   
Cash and Cash Equivalents, Fair Value Disclosure 482us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CashAndCashEquivalentsMember
849us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CashAndCashEquivalentsMember
   
Investments [Member]        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 884us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember
1,064us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember
   
Investments and funds, Fair Value 885us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember
1,065us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ShortTermInvestmentsMember
   
Funds held for customers [Member]        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 354us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_FundsHeldForCustomersMember
289us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_FundsHeldForCustomersMember
   
Investments and funds, Fair Value 354us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_FundsHeldForCustomersMember
289us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_FundsHeldForCustomersMember
   
Long-term investments [Member]        
Cash and Cash Equivalents Items [Line Items]        
Investments and funds, Amortized Cost 35us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_LongTermInvestmentMember
31us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_LongTermInvestmentMember
   
Investments and funds, Fair Value $ 35us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_LongTermInvestmentMember
$ 31us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= intu_LongTermInvestmentMember