Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 26, 2011	Nov. 27, 2010	Nov. 26, 2011	Nov. 27, 2010
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	$ 88	$ 134	$ 110	$ 280
Changes in unrealized losses included in other comprehensive income	(3)	0	(3)	(5)
Sales	(4)	(3)	(26)	(143)
Interest received				(1)
Balance at the end of the period	81	131	81	131
Student loan bonds
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	86	116	108	261
Changes in unrealized losses included in other comprehensive income	(3)	0	(3)	(5)
Sales	(4)	(3)	(26)	(142)
Interest received				(1)
Balance at the end of the period	79	113	79	113
Municipal revenue bonds
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation.
Balance at the beginning of the period	2	18	2	19
Changes in unrealized losses included in other comprehensive income	0	0	0	0
Sales	0	0	0	(1)
Interest received				0
Balance at the end of the period	$ 2	$ 18	$ 2	$ 18