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Derivative Financial Instruments - Foreign Exchange Contracts Outstanding to Sell Various Currencies (Details)
€ in Millions, ¥ in Millions, CAD in Millions, $ in Millions
Oct. 31, 2015
JPY (¥)
Oct. 31, 2015
USD ($)
Oct. 31, 2015
EUR (€)
Oct. 31, 2015
CAD
Jan. 31, 2015
JPY (¥)
Jan. 31, 2015
USD ($)
Jan. 31, 2015
EUR (€)
Jan. 31, 2015
CAD
Nov. 01, 2014
JPY (¥)
Nov. 01, 2014
USD ($)
Nov. 01, 2014
EUR (€)
Nov. 01, 2014
CAD
Derivative Instruments and Hedging Activities Disclosure [Abstract]                        
Derivative, Notional Amount ¥ 850 $ 1,731 [1] € 2 CAD 45 ¥ 0 $ 1,395 [1] € 1 CAD 14 ¥ 0 $ 1,615 [1] € 1 CAD 14
[1] The principal currencies hedged against changes in the U.S. dollar were British pounds, Canadian dollars, Euro, and Japanese yen.