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Pension and Other Benefit Programs - Changes in Level 3 Assets (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Beginning Balance $ 1,324 $ 1,229
Additions 270 216
Distributions (195) (142)
Realized and unrealized gain (loss) 56 21
Ending Balance 1,455 1,324
Alternative Investments | Diversified
   
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Beginning Balance 179 171
Additions 86 1
Distributions (6) (2)
Realized and unrealized gain (loss) 11 9
Ending Balance 270 179
Alternative Investments | Distressed
   
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Beginning Balance 194 228
Additions 23 19
Distributions (73) (52)
Realized and unrealized gain (loss) 9 (1)
Ending Balance 153 194
Alternative Investments | Private equity/venture capital
   
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Beginning Balance 623 567
Additions 115 121
Distributions (73) (68)
Realized and unrealized gain (loss) 8 3
Ending Balance 673 623
Alternative Investments | Real estate
   
Schedule of Pension and Other Postretirement Benefits Changes in Benefit Obligation and Fair Value of Plan Assets [Line Items]    
Beginning Balance 328 263
Additions 46 75
Distributions (43) (20)
Realized and unrealized gain (loss) 28 10
Ending Balance $ 359 $ 328