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Equity - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Oct. 01, 2011
Accumulated Other Comprehensive Income [Roll Forward]      
Market Value Adjustments, Investments, Beginning Balance $ 3 $ 6 $ 7
Unrealized gains (losses) arising during the period, Investments 162 4 2
Reclassifications of realized net (gains) losses to net income, Investments (25) (7) (3)
Market Value Adjustments, Investments, Ending Balance 140 3 6
Market Value Adjustments, Cash Flow Hedges, Beginning Balance (52) (54) (102)
Unrealized gains (losses) arising during the period, Cash Flow Hedges 208 38 (72)
Reclassifications of realized net (gains) losses to net income, Cash Flow Hedges (73) [1] (36) [1] 120 [1]
Market Value Adjustments, Cash Flow Hedges, Ending Balance 83 (52) (54)
Unrecognized Pension and Postretirement Medical Expense, Beginning Balance (3,234) (2,625) (1,866)
Unrealized gains (losses) arising during the period, Unrecognized Pension and Postretirement Medical Expense 1,668 (829) (915)
Reclassifications of realized net (gains) losses to net income, Unrecognized Pension and Postretirement Medical Expense 295 220 156
Unrecognized Pension and Postretirement Medical Expense, Ending Balance (1,271) (3,234) (2,625)
Foreign Currency Translation and Other, Beginning Balance 17 43 80
Unrealized gains (losses) arising during the period, Foreign Currency Translation and Other (162) (60) (37)
Reclassifications of realized net (gains) losses to net income, Foreign Currency Translation and Other 6 34 0
Foreign Currency Translation and Other, Ending Balance (139) 17 43
AOCI, Beginning Balance (3,266) (2,630) (1,881)
Unrealized gains (losses) arising during the period, Total 1,876 (847) (1,022)
Reclassifications of realized net (gains) losses to net income, Total 203 211 273
AOCI, Ending Balance $ (1,187) $ (3,266) $ (2,630)
[1] Reclassifications of gains / (losses) on cash flow hedges are primarily recorded in revenue.