Fair Value Measurements (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Aug. 27, 2011	Aug. 28, 2010	Aug. 27, 2011	Aug. 28, 2010
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 99	$ 233	$ 110	$ 280
Changes in unrealized losses included in other comprehensive income	(3)	0	0	(5)
Sales	(8)	(99)	(22)	(140)
Interest received				(1)
Balance at the end of the period	88	134	88	134
Student loan bonds
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	97	214	108	261
Changes in unrealized losses included in other comprehensive income	(3)	0	0	(5)
Sales	(8)	(98)	(22)	(139)
Interest received				(1)
Balance at the end of the period	86	116	86	116
Municipal revenue bonds
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	2	19	2	19
Changes in unrealized losses included in other comprehensive income	0	0	0	0
Sales	0	(1)	0	(1)
Interest received				0
Balance at the end of the period	$ 2	$ 18	$ 2	$ 18