Description of Business and Segment Information Financial Information by Operating Segments (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Segment Reporting Information
Revenues	$ 15,303	$ 15,351
Media Networks
Segment Reporting Information
Revenues	5,921	5,555
Direct-to-Consumer & International
Segment Reporting Information
Revenues	918	931
Studio Entertainment intersegment content transactions | Media Networks
Segment Reporting Information
Revenues	(21)	(31)
Studio Entertainment intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(18)	(8)
Media Networks intersegment content transactions | Direct-to-Consumer & International
Segment Reporting Information
Revenues	(145)	(132)
Intersegment content transactions
Segment Reporting Information
Revenues	$ (184)	$ (171)