Equity Details about AOCI Components Reclassified to Net Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net									$ (385)	$ (260)	$ (117)
Primarily revenue	$ 12,779	$ 14,238	$ 13,336	$ 14,784	$ 13,142	$ 14,277	$ 12,969	$ 15,244	55,137	55,632	52,465
Income taxes									(4,422)	(5,078)	(5,016)
Net income attributable to Disney	$ 1,747	$ 2,366	$ 2,388	$ 2,479	$ 1,771	$ 2,597	$ 2,143	$ 2,880	8,980	9,391	8,382
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Disney									(133)	(1)	168
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net									27	0	79
Income taxes									(10)	0	(29)
Net income attributable to Disney									17	0	50
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Primarily revenue									194	264	462
Income taxes									(72)	(98)	(171)
Net income attributable to Disney									122	166	291
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrecognized Pension and Postretirement Medical Expense
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Primarily included in the computation of net periodic benefit cost									(432)	(265)	(274)
Income taxes									160	98	101
Net income attributable to Disney									$ (272)	$ (167)	$ (173)