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Benefit Plans - Benefit Obligation, Fair Value of Plan Assets and Funded Status of Defined Benefit Pension Plans and Other Postretirement Benefit Plans (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Feb. 23, 2013
Feb. 25, 2012
Feb. 26, 2011
Change in Benefit Obligation      
Plan Amendment $ (39)    
Actuarial loss (101)    
Changes in Plan Assets      
Fair value of plan assets at beginning of year 1,827    
Employer contributions 38 38 37
Fair value of plan assets at end of year 2,031 1,827  
Pension Benefits [Member]
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 2,745 2,287  
Interest cost 123 126 125
Transfers   (3)  
Actuarial loss 119 415  
Benefits paid (94) (80)  
Benefit obligation at end of year 2,893 2,745 2,287
Changes in Plan Assets      
Fair value of plan assets at beginning of year 1,827 1,723  
Actual return on plan assets 205 110  
Employer contributions (93) 77  
Benefits paid (94) (83)  
Fair value of plan assets at end of year 2,031 1,827 1,723
Funded status at end of year (862) (918)  
Other Postretirement Benefits [Member]
     
Change in Benefit Obligation      
Benefit obligation at beginning of year 116 148  
Plan Amendment   (52)  
Service cost 2 2 2
Interest cost 5 7 8
Actuarial loss (9) 17  
Benefits paid (5) (6)  
Benefit obligation at end of year 109 116 148
Changes in Plan Assets      
Employer contributions 5 6  
Plan participants' contributions 4 8  
Benefits paid (9) (14)  
Funded status at end of year $ (109) $ (116)