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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Income Taxes          
Effective Income Tax Rate, Continuing Operations 36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 44.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Unfavorable/(favorable) impact of nondeductible litigation expense, Amount $ 13us-gaap_IncomeTaxReconciliationNondeductibleExpense   $ 24us-gaap_IncomeTaxReconciliationNondeductibleExpense    
Unfavorable/(favorable) impact of nondeductible litigation expense, Percent 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense   2.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense    
Unfavorable/(favorable) impact due to remeasurement of unrecognized tax benefits, Amount     12us-gaap_IncomeTaxReconciliationOtherReconcilingItems    
Unfavorable/(favorable) impact due to remeasurement of unrecognized tax benefits, Percent     1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent    
Unfavorable/(favorable) impact of Puerto Rico tax law changes, Amount     (14)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate    
Unfavorable/(favorable) impact of Puerto Rico tax law changes, Percent     1.60%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate    
Net Unfavorable/(Favorable) Discrete Items, Amount   38us-gaap_IncomeTaxReconciliationOtherAdjustments   (23)us-gaap_IncomeTaxReconciliationOtherAdjustments  
Net Unfavorable/(Favorable) Discrete Items, Percent   7.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments   2.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments  
Unfavorable/(favorable) impact of settlements of federal and state tax controversies, settlements and unusual provisions, Amount       (67)us-gaap_IncomeTaxReconciliationTaxSettlements  
Significant Increase/(Decrease) in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound   0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Significant Increase/(Decrease) in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound 180us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound   180us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 155us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   155us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   143us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority 214cah_IndemnificationReceivable   214cah_IndemnificationReceivable   210cah_IndemnificationReceivable
Unrecognized tax benefits 525us-gaap_UnrecognizedTaxBenefits   525us-gaap_UnrecognizedTaxBenefits   510us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 333us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   333us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   322us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Federal | Minimum          
Income Taxes          
Tax years open for examination 2006        
Tax years under examination 2006        
Federal | Maximum          
Income Taxes          
Tax years open for examination 2014        
Tax years under examination 2010        
State and Foreign Jurisdiction | Minimum          
Income Taxes          
Tax years open for examination 2003        
State and Foreign Jurisdiction | Maximum          
Income Taxes          
Tax years open for examination 2014        
Loss carryback from fiscal 2007          
Income Taxes          
Unrecognized Tax Benefits, Period Increase (Decrease) (14)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeStatementLocationAxis
= cah_Losscarrybackfromfiscal2007Member
  (14)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeStatementLocationAxis
= cah_Losscarrybackfromfiscal2007Member
   
Unfavorable/(favorable) impact due to remeasurement of unrecognized tax benefits, Percent 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
/ us-gaap_IncomeStatementLocationAxis
= cah_Losscarrybackfromfiscal2007Member
  1.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
/ us-gaap_IncomeStatementLocationAxis
= cah_Losscarrybackfromfiscal2007Member
   
Impact of proposed assessment of additional tax          
Income Taxes          
Unrecognized Tax Benefits, Period Increase (Decrease)   $ 56us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeStatementLocationAxis
= cah_ImpactofproposedassessmentofadditionaltaxMember
  $ 56us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_IncomeStatementLocationAxis
= cah_ImpactofproposedassessmentofadditionaltaxMember