Composition of Certain Financial Statement Items Other Income, Costs and Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 25, 2016	Dec. 27, 2015
Charge related to KFTC investigation	$ 868
Gain on sale of wireless spectrum	0	$ 380
Proceeds from sale of wireless spectrum	0	232
Deferred payments		275
Other Operating Income (Expense) [Member]
Restructuring and restructuring-related charges	$ 8	54
Gain on sale of wireless spectrum		380
Gain (Loss) on Disposition of Business		$ 48
Minimum [Member]
Deferred payments, Due date	Jan. 01, 2020
Maximum [Member]
Deferred payments, Due date	Dec. 31, 2023