Income Taxes - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 01, 2018	Dec. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		21.00%	24.50%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 2,200
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 400
Valuation allowance			1,975	$ 1,383
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense			600
Deferred Tax Assets, operating Loss Carryforwards, Foreign			2,181	1,437
Loss from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest			472	468	$ 386
Gross unrecognized tax benefits that would reduce income tax expense and effective tax rate, if recognized			2,400	469	444
Accrued interest and penalties related to unrecognized tax benefits			965	181	234
Additional accrued interest related to unrecognized tax benefits			802	47	43
Reductions in accrued interest as a result of audit settlements and other prior-year adjustments			96	100	30
Unrecognized tax benefits, reasonably possible reduction due to payments for or resolution of open tax matters			187
Adjustments to Income Tax Expense, Income Tax Benefit from Share-based Compensation			41	52	$ 125
International Theme Parks
Income Taxes [Line Items]
Deferred Tax Assets, operating Loss Carryforwards, Foreign			$ 1,000	$ 1,000
Tax Credit Carryforward, Description				indefinite carryforward period in France and Hong Kong and a five-year carryforward period in China
CHINA | International Theme Parks
Income Taxes [Line Items]
Tax Credit Carryforward, Period			5 years
Accounting Standards Update 2016-16
Income Taxes [Line Items]
Adoption of new accounting guidance		$ 200
Scenario, Plan
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			24.50%
Minimum | Scenario, Plan
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent			13.00%
Maximum | Scenario, Plan
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent			16.00%
Cash and Cash Equivalents
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent			15.50%
Residual Earnings
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent			8.00%
TFCF
Income Taxes [Line Items]
Additional accrued interest related to unrecognized tax benefits			$ 731