Extended Protection Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2013	Aug. 03, 2012	Aug. 02, 2013	Aug. 03, 2012
Changes in deferred revenue for extended protection plan contracts
Deferred revenue - extended protection plans, beginning of period	$ 717	$ 716	$ 715	$ 704
Additions to deferred revenue	85	68	155	134
Deferred revenue recognized	(69)	(58)	(137)	(112)
Deferred revenue - extended protection plans, end of period	$ 733	$ 726	$ 733	$ 726