Debt (Components Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Apr. 28, 2012	Jan. 28, 2012	Apr. 30, 2011
Debt Instrument [Line Items]
Effective Rate	6.01%	6.01%	6.59%
Total senior debt	$ 2,150	$ 2,150	$ 1,600
Unamortized debt discount	(9)	(9)	(6)
Less current portion			(100)
Long-term debt	2,141	2,141	1,494
Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Effective Rate	6.31%	6.31%	6.31%
Total senior debt	650	650	650
Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Effective Rate	4.81%	4.81%
Total senior debt	650	650
Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Effective Rate	7.36%	7.36%	7.36%
Total senior debt	200	200	200
Senior Notes Due 2033 [Member]
Debt Instrument [Line Items]
Effective Rate	6.05%	6.05%	6.05%
Total senior debt	300	300	300
Senior Notes Due 2037 [Member]
Debt Instrument [Line Items]
Effective Rate	6.89%	6.89%	6.89%
Total senior debt	350	350	350
Senior Notes Due October 2011 [Member]
Debt Instrument [Line Items]
Effective Rate			7.41%
Total senior debt			$ 100