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Long-Term Obligations and Other Short-Term Borrowings (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2014
Debt Instrument |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Current | $ 283,000,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  |  | $ 283,000,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  | $ 801,000,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 22,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  | 22,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 290,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  | 290,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 405,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  | 405,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 2,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  | 2,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 3,001,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  | 3,001,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |
Debt Instrument, Offering Date |  |  |  | Nov. 07, 2014 |  |  |
Offer As Percentage Of Principal Amount |  |  |  | 101.00%cah_OfferAsPercentageOfPrincipalAmount |  |  |
Loss on Extinguishment of Debt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 60,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (60,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |
Loss on Extniguishment of Debt, Net of Tax |  | 37,000,000 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |  |  |  |  |
Make-Whole Premium |  | 80,000,000 us-gaap_PaymentsOfDebtExtinguishmentCosts |  |  |  |  |
Unamortized debt issuance costs |  | 2,000,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost |  |  |  |  |
Fair Value adjustment related to previously terminated swaps |  | 22,000,000 cah_Fairvalueadjustmentduetoterminationofinterestrateswap |  |  |  |  |
2.4% Notes due 2019 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Notes Payable | 454,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  | 454,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  | 0 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |
Debt Instrument, Maturity Date |  |  |  | Nov. 15, 2019 |  |  |
Debt Instrument, Face Amount | 450,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  | 450,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  | 2.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  |
Offer As Percentage Of Principal Amount |  |  |  | 101.00%cah_OfferAsPercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = cah_A2.4Notesdue2019MemberDomain |  |  |
3.5% Notes due 2024 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Notes Payable | 398,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  | 398,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  | 0 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |
Debt Instrument, Maturity Date |  |  |  | Nov. 15, 2024 |  |  |
Debt Instrument, Face Amount | 400,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  | 400,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  |
Offer As Percentage Of Principal Amount |  |  |  | 101.00%cah_OfferAsPercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = cah_A3.5Notesdue2024Member |  |  |
4.5% Notes due 2044 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Notes Payable | 345,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  | 345,000,000 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  | 0 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |
Debt Instrument, Maturity Date |  |  |  | Nov. 15, 2044 |  |  |
Debt Instrument, Face Amount | 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  | 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  |
Offer As Percentage Of Principal Amount |  |  |  | 101.00%cah_OfferAsPercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = cah_A4.5Notesdue2044MemberMember |  |  |
Committed Receivables Sales Facility Program [Member] |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of Credit Facility, Effective Date of Increase |  |  |  | Nov. 03, 2014 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 950,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  |  | 950,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  |  | 700,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember
Line of Credit Facility, Expiration Date |  |  |  | Nov. 03, 2017 |  |  |
Line of Credit Facility, Amount Outstanding | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  |  | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |
Stand by Letters of Credit Outstanding, Amount | 41,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  |  | 41,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |  | 41,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = cah_CommittedReceivablesSalesFacilityProgramMember |
Cordis [Member] |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Bridge Loan | 1,000,000,000 us-gaap_BridgeLoan / us-gaap_BusinessAcquisitionAxis = cah_CordisMember |  |  | 1,000,000,000 us-gaap_BridgeLoan / us-gaap_BusinessAcquisitionAxis = cah_CordisMember |  |  |
Future Debt Instrument, Expected Face Amount | $ 1,000,000,000 cah_FutureDebtInstrumentExpectedFaceAmount / us-gaap_BusinessAcquisitionAxis = cah_CordisMember |  |  | $ 1,000,000,000 cah_FutureDebtInstrumentExpectedFaceAmount / us-gaap_BusinessAcquisitionAxis = cah_CordisMember |  |  |

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