Description of Business and Segment Information Financial Information by Operating Segments (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Segment Reporting Information
Revenues	$ 20,858	$ 15,303
Segment operating income	4,002	3,655
Media Networks
Segment Reporting Information
Revenues	7,361	5,921
Segment operating income	1,630	1,330
Direct-to-Consumer & International
Segment Reporting Information
Revenues	3,987	918
Segment operating income	(693)	(136)
Studio Entertainment intersegment content transactions | Media Networks
Segment Reporting Information
Revenues	(53)	(21)
Segment operating income	0	0
Studio Entertainment intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(685)	(18)
Segment operating income	(116)	2
Media Networks intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(912)	(145)
Segment operating income	(105)	(2)
Intersegment transactions
Segment Reporting Information
Revenues	(1,650)	(184)
Segment operating income	$ (221)	$ 0