Impact of Adoption on the Condensed Consolidated Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle
Revenues	$ 14,922	$ 14,548	$ 30,225	$ 29,899
Cost and expenses	(11,531)	(10,511)	(23,416)	(22,069)
Income Taxes	1,647	813	2,292	85
Consolidated net income	5,611	$ 3,115	8,397	$ 7,588
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle
Revenues	14,901		30,010
Cost and expenses	(11,483)		(23,289)
Income Taxes	(1,653)		(2,272)
Consolidated net income	5,632		8,329
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	21		215
Cost and expenses	(48)		(127)
Income Taxes	6		(20)
Consolidated net income	$ (21)		$ 68