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Accounting Policies (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2014
units
Segment
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Jul. 31, 2014
Nov. 03, 2014
Jun. 30, 2014
Dec. 31, 2011
Property, Plant and Equipment [Line Items]                  
Number of reportable segments   4us-gaap_NumberOfReportableSegments              
Market value of investments $ 1,542,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,497,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,542,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 760,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue         $ 835,000,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Deferred technology costs, gross 131,000,000us-gaap_OtherDeferredCostsGross 123,000,000us-gaap_OtherDeferredCostsGross 131,000,000us-gaap_OtherDeferredCostsGross            
Accumulated amortization of deferred technology costs 71,000,000us-gaap_AccumulatedAmortizationOfOtherDeferredCosts 55,000,000us-gaap_AccumulatedAmortizationOfOtherDeferredCosts 71,000,000us-gaap_AccumulatedAmortizationOfOtherDeferredCosts            
Fair value of our long-term debt borrowings 801,000,000us-gaap_LongTermDebtFairValue 871,000,000us-gaap_LongTermDebtFairValue 801,000,000us-gaap_LongTermDebtFairValue            
After-tax gain (loss) on sale of business   160,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 589,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax          
Non-cash impairment charge       0us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf          
Non-cash impairment charge associated with the an intangible asset acquired 26,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived   26,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived            
Number of operating segments   4us-gaap_NumberOfOperatingSegments              
Cost of advertisement   35,000,000us-gaap_AdvertisingExpense 41,000,000us-gaap_AdvertisingExpense 31,000,000us-gaap_AdvertisingExpense          
Other (Income) Loss [Member]                  
Property, Plant and Equipment [Line Items]                  
Non-cash impairment charge         6,000,000mhfi_NonCashImpairmentCharge
/ us-gaap_IncomeStatementLocationAxis
= mhfi_OtherIncomeLossMember
       
Non-cash impairment charge 36,000,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_IncomeStatementLocationAxis
= mhfi_OtherIncomeLossMember
               
Harold W. McGraw III [Member]                  
Property, Plant and Equipment [Line Items]                  
Amount of transaction with related party           20,000,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mhfi_HaroldW.McGrawIIIMember
     
Minimum [Member] | Software and Software Development Costs [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   3 years              
Minimum [Member] | Building Improvements [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   15 years              
Minimum [Member] | Equipment [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   2 years              
Maximum [Member] | Software and Software Development Costs [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   7 years              
Maximum [Member] | Building Improvements [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   40 years              
Maximum [Member] | Equipment [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant and equipment useful life   10 years              
McGraw Hill Construction [Member]                  
Property, Plant and Equipment [Line Items]                  
Cash proceeds from sale of business             320,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mhfi_McGrawHillConstructionMember
   
After-tax gain (loss) on sale of business   160,000,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mhfi_McGrawHillConstructionMember
             
Data Center [Member]                  
Property, Plant and Equipment [Line Items]                  
Cash proceeds from sale of business               58,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mhfi_DataCenterMember
 
Data Center [Member] | Other (Income) Loss [Member]                  
Property, Plant and Equipment [Line Items]                  
After-tax gain (loss) on sale of business               $ (3,000,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mhfi_DataCenterMember
/ us-gaap_IncomeStatementLocationAxis
= mhfi_OtherIncomeLossMember