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Income Taxes (Details 6) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward      
Balance at beginning of year $ 47us-gaap_UnrecognizedTaxBenefits $ 51us-gaap_UnrecognizedTaxBenefits $ 69us-gaap_UnrecognizedTaxBenefits
Increases for tax positions taken in the current year 1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Increases for tax positions taken in prior years 3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Decreases for tax positions taken in prior years (3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (35)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements (6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Increases due to acquisitions   4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition 15us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Decrease from lapse of statute of limitations (3)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (2)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Changes due to currency translation (1)fdx_UnrecognizedTaxBenefitsChangesResultingFromCurrencyTranslation 2fdx_UnrecognizedTaxBenefitsChangesResultingFromCurrencyTranslation (1)fdx_UnrecognizedTaxBenefitsChangesResultingFromCurrencyTranslation
Balance at end of year $ 38us-gaap_UnrecognizedTaxBenefits $ 47us-gaap_UnrecognizedTaxBenefits $ 51us-gaap_UnrecognizedTaxBenefits