Borrowings Borrowings - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Line of Credit Facility
Line of Credit Facility, Interest Rate Description			All of the above bank facilities allow for borrowings at LIBOR-based rates plus a spread depending on the credit default swap spread applicable to the Company’s debt, subject to a cap and floor that vary with the Company’s debt rating assigned by Moody’s Investors Service and Standard and Poor’s. The spread above LIBOR can range from 0.23% to 1.63%.
Line of Credit Facility, Maximum Borrowing Capacity	$ 6,000,000,000		$ 6,000,000,000
Letters of Credit Outstanding, Amount	220,000,000		220,000,000
Interest Income/(Expense)
Net Gains on Available-For-Sale Securities	48,000,000	92,000,000	48,000,000	151,000,000
Cost-method Investments, Realized Gains	7,000,000	0	7,000,000	46,000,000
Letter of Credit
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	800,000,000		800,000,000
Minimum
Line of Credit Facility
Variable Spread Above LIBOR			0.23%
Maximum
Line of Credit Facility
Variable Spread Above LIBOR			1.63%
Existing Line of Credit 3
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500,000,000		$ 1,500,000,000