Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Losses for Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	Feb. 22, 2014	Feb. 23, 2013	Feb. 25, 2012	Feb. 26, 2011
Defined Benefit Plan Disclosure [Line Items]
Total recognized in Accumulated other comprehensive loss	$ (307)	$ (612)	$ (657)	$ (446)
Total recognized in Accumulated other comprehensive loss, net of tax	(307)	(612)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service benefit
Net actuarial loss	(567)	(928)
Total recognized in Accumulated other comprehensive loss	(567)	(928)
Total recognized in Accumulated other comprehensive loss, net of tax	(324)	(570)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service benefit	55	57
Net actuarial loss	(25)	(46)
Total recognized in Accumulated other comprehensive loss	30	11
Total recognized in Accumulated other comprehensive loss, net of tax	$ 17	$ 7