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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 $ 283,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent     $ 283,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent   $ 801,000,000us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent  
Long-term Debt, Maturities, Repayments of Principal in Year Two 22,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo     22,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo      
Long-term Debt, Maturities, Repayments of Principal in Year Three 290,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree     290,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree      
Long-term Debt, Maturities, Repayments of Principal in Year Four 405,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour     405,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour      
Long-term Debt, Maturities, Repayments of Principal in Year Five 2,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive     2,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive      
Long-term Debt, Maturities, Repayments of Principal after Year Five 3,001,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive     3,001,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive      
Debt Instrument, Offering Date       Nov. 07, 2014      
Offer As Percentage Of Principal Amount       101.00%cah_OfferAsPercentageOfPrincipalAmount      
Loss on Extinguishment of Debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 60,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt (60,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt    
Loss on Extniguishment of Debt, Net of Tax   37,000,000us-gaap_ExtinguishmentOfDebtGainLossNetOfTax          
Make-Whole Premium   80,000,000us-gaap_PaymentsOfDebtExtinguishmentCosts          
Unamortized debt issuance costs   2,000,000us-gaap_WriteOffOfDeferredDebtIssuanceCost          
Fair Value adjustment related to previously terminated swaps   22,000,000cah_Fairvalueadjustmentduetoterminationofinterestrateswap          
2.4% Notes due 2019              
Debt Instrument              
Notes Payable 454,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A2.4Notesdue2019MemberDomain
    454,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A2.4Notesdue2019MemberDomain
  0us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A2.4Notesdue2019MemberDomain
 
Debt Instrument, Maturity Date       Nov. 15, 2019      
Debt Instrument, Face Amount 450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cah_A2.4Notesdue2019MemberDomain
    450,000,000us-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 398,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A3.5Notesdue2024Member
    398,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A3.5Notesdue2024Member
  0us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A3.5Notesdue2024Member
 
Debt Instrument, Maturity Date       Nov. 15, 2024      
Debt Instrument, Face Amount 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cah_A3.5Notesdue2024Member
    400,000,000us-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 345,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A4.5Notesdue2044MemberMember
    345,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A4.5Notesdue2044MemberMember
  0us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= cah_A4.5Notesdue2044MemberMember
 
Debt Instrument, Maturity Date       Nov. 15, 2044      
Debt Instrument, Face Amount 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cah_A4.5Notesdue2044MemberMember
    350,000,000us-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 950,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
    950,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
    700,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
Line of Credit Facility, Expiration Date       Nov. 03, 2017      
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
    0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
  0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
 
Stand by Letters of Credit Outstanding, Amount 41,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
    41,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
  41,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= cah_CommittedReceivablesSalesFacilityProgramMember
 
Cordis [Member]              
Debt Instrument              
Bridge Loan 1,000,000,000us-gaap_BridgeLoan
/ us-gaap_BusinessAcquisitionAxis
= cah_CordisMember
    1,000,000,000us-gaap_BridgeLoan
/ us-gaap_BusinessAcquisitionAxis
= cah_CordisMember
     
Future Debt Instrument, Expected Face Amount $ 1,000,000,000cah_FutureDebtInstrumentExpectedFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= cah_CordisMember
    $ 1,000,000,000cah_FutureDebtInstrumentExpectedFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= cah_CordisMember