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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Income Taxes          
Effective Income Tax Rate, Continuing Operations 34.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Unfavorable/(favorable) impact due to remeasurement of unrecognized tax benefits, Amount     $ 61us-gaap_IncomeTaxReconciliationOtherReconcilingItems    
Net Unfavorable/(Favorable) Discrete Items, Amount     (18)us-gaap_IncomeTaxReconciliationOtherAdjustments    
Unfavorable/(favorable) impact of settlements of federal and state tax controversies, settlements and unusual provisions, Amount     (67)us-gaap_IncomeTaxReconciliationTaxSettlements    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 154us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   154us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   143us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority 217cah_IndemnificationReceivable   217cah_IndemnificationReceivable   210cah_IndemnificationReceivable
Unrecognized tax benefits 526us-gaap_UnrecognizedTaxBenefits   526us-gaap_UnrecognizedTaxBenefits   510us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 333us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   333us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   322us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Minimum          
Income Taxes          
Significant Increase/(Decrease) in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 0us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  0us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum          
Income Taxes          
Significant Increase/(Decrease) in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound $ 175us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  $ 175us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Federal | Minimum          
Income Taxes          
Tax years under examination 2006        
Federal | Maximum          
Income Taxes          
Tax years under examination 2010