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Commitments and Contingencies - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Sep. 24, 2011
Commitments and Contingencies Disclosure [Line Items]      
Purchase commitments maximum period   150 days  
Long-term supply agreements, outstanding inventory component prepayments $ 4,400,000,000 $ 4,400,000,000 $ 2,300,000,000
Long-term supply agreements, outstanding inventory component prepayments, current 1,300,000,000 1,300,000,000  
Long-term supply agreements, outstanding inventory component prepayments, noncurrent 3,100,000,000 3,100,000,000  
Inventory component prepayments utilized 41,000,000 634,000,000  
Outstanding off-balance sheet commitments under certain long-term supply agreements 302,000,000 302,000,000  
Maximum term of major facility leases 10 years 10 years  
Maximum term of renewal options on leases 5 years 5 years  
Minimum term of leases for retail space 5 years 5 years  
Maximum term of leases for retail space 20 years 20 years  
Majority of term of leases for retail space 10 years 10 years  
Total future minimum lease payments under noncancelable operating leases 4,100,000,000 4,100,000,000  
Future minimum lease payments under noncancelable operating leases related to leases for retail space 3,000,000,000 3,000,000,000  
Outstanding off-balance sheet commitments for outsourced manufacturing and component purchases 13,600,000,000 13,600,000,000  
Outstanding off-balance sheet commitments for other outstanding obligations $ 4,500,000,000 $ 4,500,000,000  
Minimum
      
Commitments and Contingencies Disclosure [Line Items]      
Long-term supply agreements, expiration year   2012  
Maximum
      
Commitments and Contingencies Disclosure [Line Items]      
Long-term supply agreements, expiration year   2022