Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2012 Customer Vendor	Mar. 31, 2012 Customer Vendor	Sep. 24, 2011 Vendor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maturities of long-term marketable securities, minimum	1 year	1 year
Maturities of long-term marketable securities, maximum	5 years	5 years
Range of time hedged in cash flow hedge		The Company typically hedges portions of its forecasted foreign currency exposure associated with revenue and inventory purchases generally up to six months.
Net deferred gain associated with cash flow hedges	$ 105	$ 105	$ 290
Hedged transactions, expected occurrence		6 months
Cash collateral received, derivative instruments	$ 217	$ 217	$ 288
Number of customers representing a significant portion of trade receivables	1	1
Number of vendors representing a significant portion of trade receivables	2	2	2
Customer One Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables from customer, percentage of total trade receivables	13.00%	13.00%
Total Cellular Network Carriers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables from customer, percentage of total trade receivables	47.00%	47.00%	52.00%
Vendor One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Vendor non-trade receivables, as percentage of total non-trade receivable	60.00%	60.00%	53.00%
Vendor Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Vendor non-trade receivables, as percentage of total non-trade receivable	19.00%	19.00%	29.00%