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Pension and Other Benefit Programs - Benefit Obligations, Assets, Funded Status and Balance Sheet Impacts Associated with Pension and Postretirement Medical Benefit Plans based upon Actuarial Valuations (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Oct. 01, 2011
Fair value of plans' assets      
Beginning fair value $ 8,437    
Contributions 505    
Ending fair value 9,473    
Amounts recognized in the balance sheet      
Non-current liabilities (2,091) (4,828)  
Net balance sheet liability (1,918)    
Pension Plans
     
Projected benefit obligations      
Beginning obligations (11,530) (9,481)  
Service cost (349) (278) (293)
Interest cost (433) (440) (411)
Actuarial (loss) / gain 2,044 (1,635)  
Plan amendments and other (60) 51  
Benefits paid 262 253  
Ending obligations (10,066) (11,530) (9,481)
Fair value of plans' assets      
Beginning fair value 8,049 6,551  
Actual return on plan assets 807 972  
Contributions 397 833  
Benefits paid (262) (253)  
Expenses and other (26) (54)  
Ending fair value 8,965 8,049 6,551
Underfunded status of the plans (1,101) (3,481)  
Amounts recognized in the balance sheet      
Non-current assets 234 27  
Current liabilities (46) (24)  
Non-current liabilities (1,289) (3,484)  
Net balance sheet liability (1,101) (3,481)  
Postretirement Medical Plans
     
Projected benefit obligations      
Beginning obligations (1,748) (1,578)  
Service cost (18) (21) (18)
Interest cost (66) (74) (66)
Actuarial (loss) / gain 476 (107)  
Plan amendments and other (9)    
Benefits paid 40 32  
Ending obligations (1,325) (1,748) (1,578)
Fair value of plans' assets      
Beginning fair value 388 302  
Actual return on plan assets 45 48  
Contributions 108 72  
Benefits paid (40) (32)  
Expenses and other 7 (2)  
Ending fair value 508 388 302
Underfunded status of the plans (817) (1,360)  
Amounts recognized in the balance sheet      
Current liabilities (15) (16)  
Non-current liabilities (802) (1,344)  
Net balance sheet liability $ (817) $ (1,360)