Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		5 Months Ended	6 Months Ended
	Aug. 03, 2013	Aug. 04, 2012	Aug. 04, 2012	Aug. 03, 2013
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 21	$ 66	$ 82	$ 21
Changes in unrealized losses included in other comprehensive income		3	4
Sales	(5)	(47)	(64)	(5)
Balance at the end of the period	16	22	22	16
Student loan bonds [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	19	64	80	19
Changes in unrealized losses included in other comprehensive income		3	4
Sales	(5)	(47)	(64)	(5)
Balance at the end of the period	14	20	20	14
Municipal revenue bonds [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	2	2	2	2
Changes in unrealized losses included in other comprehensive income		0	0
Sales	0	0	0	0
Balance at the end of the period	$ 2	$ 2	$ 2	$ 2