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Benefit Plans (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 25, 2012	Feb. 26, 2011
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at end of year	$ 2,016	$ 1,896
Real Estate Partnerships [Member]
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at end of year	125	95
Private Equity [Member]
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at end of year	97	66
Level 3 [Member]
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at end of year	222	161
Level 3 [Member] \| Real Estate Partnerships [Member]
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at beginning of year	95
Purchases	20	87
Sales	(2)
Unrealized gains	12	8
Realized gains and losses
Fair value of plan assets at end of year	125	95
Level 3 [Member] \| Private Equity [Member]
Summary of changes in the fair value for level 3 investments
Fair value of plan assets at beginning of year	66	35
Purchases	30	28
Sales	(7)	(3)
Unrealized gains	8	6
Realized gains and losses
Fair value of plan assets at end of year	$ 97	$ 66

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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