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Fair Value Measurements and Concentrations of Credit Risk (Estimated Fair Value Of Company Long Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2015	Feb. 01, 2014
Long-term debt	$ 8,219us-gaap_LongTermDebt	$ 7,171us-gaap_LongTermDebt
Notional Amount
Long-term debt	7,090	6,522
Carrying Amount
Long-term debt	$ 7,236	$ 6,684

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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