Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 28, 2012	Oct. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (Losses)	$ (43)	$ (7)
Business Restructuring Reserves [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (Losses)	(43)	(7)
Business Restructuring Reserves [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Lease obligation costs, net	$ (169)	$ (145)