Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		5 Months Ended
	Aug. 04, 2012	Jul. 30, 2011	Aug. 04, 2012	Jul. 30, 2011
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 66	$ 97	$ 82	$ 110
Changes in unrealized losses included in other comprehensive income	3	2	4	3
Sales	(47)	(8)	(64)	(22)
Balance at the end of the period	22	91	22	91
Student loan bonds [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	64	95	80	108
Changes in unrealized losses included in other comprehensive income	3	2	4	3
Sales	(47)	(8)	(64)	(22)
Balance at the end of the period	20	89	20	89
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	0	0
Sales	0	0	0	0
Balance at the end of the period	$ 2	$ 2	$ 2	$ 2