Benefit Plans - Net Periodic Benefit Cost (Income) and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) for Defined Benefit Pension and Other Postretirement Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 22, 2014	Feb. 23, 2013	Feb. 25, 2012
Pension Benefits [Member]
Net Periodic Benefit Cost
Service cost
Interest cost	121	123	126
Expected return on plan assets	(141)	(133)	(114)
Amortization of prior service benefit
Amortization of net actuarial loss	101	111	88
Settlement			2
Net periodic benefit cost (income)	81	101	102
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Prior service benefit
Amortization of prior service benefit
Net actuarial (gain) loss	(259)	46	417
Amortization of net actuarial gain	(101)	(110)	(88)
Total recognized in Other comprehensive (income) loss	(360)	(64)	329
Total recognized in net periodic benefit (cost) income and Other comprehensive income (loss)	279	37	431
Other Postretirement Benefits [Member]
Net Periodic Benefit Cost
Service cost	2	2	2
Interest cost	4	5	7
Expected return on plan assets
Amortization of prior service benefit	(13)	(12)	(9)
Amortization of net actuarial loss	5	6	4
Settlement
Net periodic benefit cost (income)	(2)	1	4
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Prior service benefit	(11)		(52)
Amortization of prior service benefit	12	13	9
Net actuarial (gain) loss	(16)	(7)	16
Amortization of net actuarial gain	(5)	(6)	(4)
Total recognized in Other comprehensive (income) loss	(20)		(31)
Total recognized in net periodic benefit (cost) income and Other comprehensive income (loss)	$ 22	$ 1	$ (27)