Description of Business and Segment Information Financial Information by Operating Segments (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting Information
Revenues	$ 14,922	$ 14,548	$ 30,225	$ 29,899
Segment operating income	3,816	4,237	7,471	8,223
Media Networks
Segment Reporting Information
Revenues	5,525	5,508	11,446	11,063
Segment operating income	2,185	2,258	3,515	3,501
Direct-to-Consumer & International
Segment Reporting Information
Revenues	955	831	1,873	1,762
Segment operating income	(393)	(188)	(529)	(230)
Studio Entertainment intersegment content transactions | Media Networks
Segment Reporting Information
Revenues	(13)	(64)	(34)	(95)
Segment operating income	5	(16)	5	(9)
Studio Entertainment intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(82)	(8)	(100)	(16)
Segment operating income	(46)	0	(44)	0
Media Networks intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(139)	(121)	(284)	(253)
Segment operating income	0	0	(2)	(1)
Intersegment transactions
Segment Reporting Information
Revenues	(234)	(193)	(418)	(364)
Segment operating income	$ (41)	$ (16)	$ (41)	$ (10)