Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		8 Months Ended
	Nov. 03, 2012	Oct. 29, 2011	Nov. 03, 2012	Oct. 29, 2011
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 22	$ 91	$ 82	$ 110
Changes in unrealized losses included in other comprehensive income	0	(3)	4	0
Sales	(1)	(4)	(65)	(26)
Balance at the end of the period	21	84	21	84
Student loan bonds [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	20	89	80	108
Changes in unrealized losses included in other comprehensive income	0	(3)	4	0
Sales	(1)	(4)	(65)	(26)
Balance at the end of the period	19	82	19	82
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