Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		8 Months Ended	9 Months Ended
	Nov. 02, 2013	Nov. 03, 2012	Nov. 03, 2012	Nov. 02, 2013
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 16	$ 22	$ 82	$ 21
Changes in unrealized losses included in other comprehensive income			4
Sales	(7)	(1)	(65)	(12)
Balance at the end of the period	9	21	21	9
Student loan bonds [Member]
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	14	20	80	19
Changes in unrealized losses included in other comprehensive income			4
Sales	(7)	(1)	(65)	(12)
Balance at the end of the period	7	19	19	7
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
Sales	0	0	0	0
Balance at the end of the period	$ 2	$ 2	$ 2	$ 2