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Income Taxes - Additional Information (Details) $ in Millions	9 Months Ended
	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