Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	May 02, 2015		Jan. 31, 2015		May 03, 2014
Carrying Amount
Financial liabilities
Debt	$ 11,947	[1],[2]	$ 11,946	[1],[2]	$ 12,064	[1],[2]
Fair Value
Financial liabilities
Debt	$ 13,542	[1],[2]	$ 14,089	[1],[2]	$ 13,721	[1],[2]

[1] The carrying amounts of certain other current assets, accounts payable, and certain accrued and other current liabilities approximate fair value due to their short-term nature.

[2] The carrying amount and estimated fair value of debt exclude unamortized swap valuation adjustments and capital lease obligations.