Benefit Plans - Fair Value of Assets of Company's Benefit Plans Held in Master Trust (Detail) (USD $) In Millions, unless otherwise specified	Feb. 22, 2014	Feb. 23, 2013	Feb. 25, 2012
Changes in Plan Assets
Total plan assets at fair value	$ 2,261	$ 2,031
Common Stock [Member]
Changes in Plan Assets
Total plan assets at fair value	579	554
Common collective trusts - fixed income [Member]
Changes in Plan Assets
Total plan assets at fair value	253	247
Common collective trusts - equity [Member]
Changes in Plan Assets
Total plan assets at fair value	344	335
Government securities [Member]
Changes in Plan Assets
Total plan assets at fair value	181	152
Mutual funds [Member]
Changes in Plan Assets
Total plan assets at fair value	295	272
Corporate bonds [Member]
Changes in Plan Assets
Total plan assets at fair value	290	183
Real estate partnerships [Member]
Changes in Plan Assets
Total plan assets at fair value	149	136
Private equity [Member]
Changes in Plan Assets
Total plan assets at fair value	125	110
Mortgage-backed securities [Member]
Changes in Plan Assets
Total plan assets at fair value	37	35
Other [Member]
Changes in Plan Assets
Total plan assets at fair value	8	7
Level 1 [Member]
Changes in Plan Assets
Total plan assets at fair value	723	668
Level 1 [Member] | Common Stock [Member]
Changes in Plan Assets
Total plan assets at fair value	579	554
Level 1 [Member] | Common collective trusts - fixed income [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Common collective trusts - equity [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Government securities [Member]
Changes in Plan Assets
Total plan assets at fair value	92	60
Level 1 [Member] | Mutual funds [Member]
Changes in Plan Assets
Total plan assets at fair value	52	51
Level 1 [Member] | Corporate bonds [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Real estate partnerships [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Private equity [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Mortgage-backed securities [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 1 [Member] | Other [Member]
Changes in Plan Assets
Total plan assets at fair value		3
Level 2 [Member]
Changes in Plan Assets
Total plan assets at fair value	1,264	1,117
Level 2 [Member] | Common Stock [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 2 [Member] | Common collective trusts - fixed income [Member]
Changes in Plan Assets
Total plan assets at fair value	253	247
Level 2 [Member] | Common collective trusts - equity [Member]
Changes in Plan Assets
Total plan assets at fair value	344	335
Level 2 [Member] | Government securities [Member]
Changes in Plan Assets
Total plan assets at fair value	89	92
Level 2 [Member] | Mutual funds [Member]
Changes in Plan Assets
Total plan assets at fair value	243	221
Level 2 [Member] | Corporate bonds [Member]
Changes in Plan Assets
Total plan assets at fair value	290	183
Level 2 [Member] | Real estate partnerships [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 2 [Member] | Private equity [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 2 [Member] | Mortgage-backed securities [Member]
Changes in Plan Assets
Total plan assets at fair value	37	35
Level 2 [Member] | Other [Member]
Changes in Plan Assets
Total plan assets at fair value	8	4
Level 3 [Member]
Changes in Plan Assets
Total plan assets at fair value	274	246
Level 3 [Member] | Common Stock [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Common collective trusts - fixed income [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Common collective trusts - equity [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Government securities [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Mutual funds [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Corporate bonds [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Real estate partnerships [Member]
Changes in Plan Assets
Total plan assets at fair value	149	136	113
Level 3 [Member] | Private equity [Member]
Changes in Plan Assets
Total plan assets at fair value	125	110	88
Level 3 [Member] | Mortgage-backed securities [Member]
Changes in Plan Assets
Total plan assets at fair value
Level 3 [Member] | Other [Member]
Changes in Plan Assets
Total plan assets at fair value