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Derivative Instruments Derivative Instruments (Interest Rate Contracts - Fair Value Hedging Disclosures) (Details) - Fair Value Hedging [Member] - Interest Rate Swap [Member] - USD ($)
$ in Millions
May. 02, 2015
Jan. 31, 2015
Fixed Rate 6.90% Notes Due July 2017 [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 100 $ 200
Fixed Rate 8.50% Notes Due June 2019 [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 100 $ 200