Description of Business and Segment Information Financial Information by Operating Segments (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information
Revenues	$ 18,009	$ 14,922	$ 38,867	$ 30,225
Segment operating income	2,416	3,816	6,418	7,471
Media Networks
Segment Reporting Information
Revenues	7,257	5,683	14,618	11,604
Segment operating income	2,375	2,230	4,005	3,560
Direct-to-Consumer & International
Segment Reporting Information
Revenues	4,123	1,145	8,110	2,063
Segment operating income	(812)	(385)	(1,505)	(521)
Studio Entertainment intersegment content transactions | Media Networks
Segment Reporting Information
Revenues	(58)	(13)	(111)	(34)
Segment operating income	(10)	5	(10)	5
Studio Entertainment intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(461)	(82)	(1,146)	(100)
Segment operating income	(157)	(46)	(273)	(44)
Media Networks intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(934)	(139)	(1,846)	(284)
Segment operating income	(85)	0	(190)	(2)
Intersegment transactions
Segment Reporting Information
Revenues	(1,453)	(234)	(3,103)	(418)
Segment operating income	$ (252)	$ (41)	$ (473)	$ (41)