Summary of Significant Accounting Policies - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 22, 2014	Feb. 23, 2013	Feb. 25, 2012
Equity [Abstract]
Pension and postretirement benefit plan accumulated other comprehensive loss at beginning of the fiscal year, net of tax	$ (612)	$ (657)	$ (446)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit of $(85), $18 and $161, respectively	202	(20)	(262)
Amortization of amounts included in net periodic benefit cost, net of tax (expense) of $(38), $(40) and $(32), respectively	55	65	51
Net current-period Other comprehensive income (loss), net of tax (expense) benefit of $(149), $(22) and $129, respectively	257	45	(211)
Divestiture of NAI pension plan accumulated other comprehensive loss, net of tax (expense) of $(31)	48
Pension and postretirement benefit plan accumulated other comprehensive loss at the end of period, net of tax	$ (307)	$ (612)	$ (657)