Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions				3 Months Ended	6 Months Ended
		Mar. 20, 2019	Sep. 30, 2018	Mar. 30, 2019	Mar. 30, 2019	Sep. 29, 2018
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax					$ (683)
AOCI reclassifications to retained earnings, before tax					(23)
AOCI reclassifications to retained earnings, net of tax	[1]				$ (706)
Treasury stock, shares				19,000	19,000	1,400,000
Common stock, authorized				4,600,000	4,600,000	4,600,000
Common stock, par value				$ 0.01	$ 0.01	$ 0.01
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, authorized				100,000	100,000
Preferred stock, par value				$ 0.01	$ 0.01
Investments
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax					$ 9
AOCI reclassifications to retained earnings, before tax					(24)
AOCI reclassifications to retained earnings, net of tax	[1]				(15)
Cash Flow Hedges
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax					(9)
AOCI reclassifications to retained earnings, before tax					1
AOCI reclassifications to retained earnings, net of tax	[1]				(8)
Unrecognized Pension and Postretirement Medical Expense
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax					(667)
AOCI reclassifications to retained earnings, before tax					0
AOCI reclassifications to retained earnings, net of tax	[1]				(667)
Accumulated Foreign Currency Adjustment Attributable to Parent
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax					(16)
AOCI reclassifications to retained earnings, before tax					0
AOCI reclassifications to retained earnings, net of tax	[1]				(16)
Retained Earnings
Class of Stock [Line Items]
Treasury Stock, Retired, Cost Method, Amount				$ (49,118)	$ (49,118)
Accounting Standards Update 2018-02
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, tax			$ 691
Accounting Standards Update 2016-01
Class of Stock [Line Items]
AOCI reclassifications to retained earnings, before tax			24
AOCI reclassifications to retained earnings, net of tax			$ 15
21CF
Class of Stock [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		307,000
Legacy Disney
Class of Stock [Line Items]
Treasury Stock, Shares, Retired		1,400,000
Legacy Disney | Series B Preferred Stock
Class of Stock [Line Items]
Preferred stock, authorized						40
Preferred stock, par value						$ 0.01
Legacy Disney | Additional Paid-in Capital
Class of Stock [Line Items]
Treasury Stock, Retired, Cost Method, Amount		$ 17,600
Legacy Disney | Retained Earnings
Class of Stock [Line Items]
Treasury Stock, Retired, Cost Method, Amount		$ 49,100

[1] At the beginning of fiscal 2019, the Company adopted new FASB accounting guidance, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, and reclassified $691 million from AOCI to retained earnings.In addition, at the beginning of fiscal 2019, the Company adopted new FASB accounting guidance, Recognition and Measurement of Financial Assets and Liabilities, and reclassified $24 million ($15 million after tax) of market value adjustments on investments previously recorded in AOCI to retained earnings.