Impact of Adoption on the Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018		Jun. 29, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle
Revenues	$ 20,245	$ 15,229	[1]	$ 50,470	$ 45,128	[2]
Cost and expenses	(17,485)	(11,305)		(40,904)	(33,374)
Income taxes	(395)	(795)		(2,687)	(880)
Net income	1,982	$ 3,059		10,379	$ 10,647
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle
Revenues	20,250			50,260
Cost and expenses	(17,437)			(40,730)
Income taxes	(407)			(2,679)
Net income	2,023			10,351
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle
Revenues	(5)			210
Cost and expenses	(48)			(174)
Income taxes	12			(8)
Net income	$ (41)			$ 28

[1] Amounts reflect our historical accounting prior to the adoption of the new revenue guidance.

[2] Amounts reflect our historical accounting prior to the adoption of the new revenue guidance.