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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
0 Months Ended 12 Months Ended
Feb. 21, 2014
Aug. 23, 2011
Feb. 22, 2014
Feb. 23, 2013
Feb. 25, 2012
Change in Benefit Obligation          
Plan Amendment $ (11) $ (39)      
Actuarial loss (gain)     (63)    
Changes in Plan Assets          
Fair value of plan assets at beginning of year     2,031    
Employer contributions     39 38 38
Fair value of plan assets at end of year     2,261 2,031  
Pension Benefits [Member]
         
Change in Benefit Obligation          
Benefit obligation at beginning of year     2,893 2,745  
Service cost             
Interest cost     121 123 126
Actuarial loss (gain)     (141) 119  
Benefits paid     (147) (94)  
Benefit obligation at end of year     2,726 2,893 2,745
Changes in Plan Assets          
Fair value of plan assets at beginning of year     2,031 1,827  
Actual return on plan assets     259 205  
Employer contributions     118 93  
Benefits paid     (147) (94)  
Fair value of plan assets at end of year     2,261 2,031 1,827
Funded status at end of year     (465) (862)  
Other Postretirement Benefits [Member]
         
Change in Benefit Obligation          
Benefit obligation at beginning of year     109 116  
Plan Amendment     (11)    
Service cost     2 2 2
Interest cost     4 5 7
Actuarial loss (gain)     (12) (9)  
Benefits paid     (6) (5)  
Other     (5)    
Benefit obligation at end of year     81 109 116
Changes in Plan Assets          
Employer contributions     6 5  
Plan participants' contributions     3 4  
Benefits paid     (9) (9)  
Funded status at end of year     $ (81) $ (109)