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Income Taxes - Additional Information (Details) $ in Millions | 9 Months Ended
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Oct. 31, 2015 USD ($)
Income Tax Disclosure [Abstract] |
Decrease In Gross Unrecognized Tax Benefits Within The Next 12 Months | $ 5
Benefit To Income Taxes If Decrease In Gross Unrecognized Tax Benefits Within 12 Months Are Recognized | 0
Interest Expense Reversed | 15
Other Tax Expense (Benefit) | $ 31

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- Definition Decrease In Gross Unrecognized Tax Benefits Within The Next 12 Months. + References No definition available. + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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