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Divestitures 1 (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Income from discontinued operations      
Income from discontinued operations, net of tax $ 36us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity $ 27us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity $ 34us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Discontinued Operations      
Income from discontinued operations      
Total revenue 62us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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135us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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139us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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Income from operations of discontinued components, net of tax expense of $10 million, $19 million and $24 million, respectively 16us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
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27us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
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34us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
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Gain on disposal of discontinued component, net of tax 20us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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Income from discontinued operations, net of tax 36us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
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27us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
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34us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
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Tax expense on income from operations of discontinued components 10us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
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19us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
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24us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
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Discontinued Operations | Subscription and Maintenance      
Income from discontinued operations      
Total revenue 43us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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88us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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Discontinued Operations | Software Fees and Other      
Income from discontinued operations      
Total revenue $ 19us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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$ 47us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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$ 45us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
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