International Theme Parks Impact of Consolidating Balance Sheets of International Theme Parks - Asia International Theme Parks (Details) - USD ($) $ in Millions	Mar. 31, 2018		Sep. 30, 2017
Schedule Of Condensed Consolidating Balance Sheets - Asia International Theme Parks [Line Items]
Total assets	$ 97,943		$ 95,789
Parks, resorts and other property	29,200		28,406
Asia International Theme Parks [Member]
Schedule Of Condensed Consolidating Balance Sheets - Asia International Theme Parks [Line Items]
Total assets	8,000		8,000
Parks, resorts and other property	7,000		7,000
Total liabilities	$ 2,000	[1]	$ 2,000

[1] Total assets of the Asia Theme Parks were $8 billion at March 31, 2018 and September 30, 2017, which primarily consist of parks, resorts and other property of $7 billion at March 31, 2018 and September 30, 2017. Total liabilities of the Asia Theme Parks were $2 billion at March 31, 2018 and September 30, 2017.