Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets (Future Estimated Intangible Amortization Expense) (Details)

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Goodwill and Other Intangible Assets (Future Estimated Intangible Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 21us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive