Borrowings - Additional Information (Details) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 12,250
Line of Credit Facility, Interest Rate Description	All of the above bank facilities allow for borrowings at LIBOR-based rates plus a spread depending on the credit default swap spread applicable to the Company’s debt, subject to a cap and floor that vary with the Company’s debt rating assigned by Moody’s Investors Service and Standard and Poor’s. The spread above LIBOR can range from 0.18% to 1.63%.
Letters of Credit Outstanding, Amount	$ 196
Letter of Credit
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 500
Minimum
Line of Credit Facility
Variable Spread Above LIBOR	0.18%
Maximum
Line of Credit Facility
Variable Spread Above LIBOR	1.63%
Credit Facility available beginning April 2021 [Member] | Disney Cruise Line [Member]
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Credit Facility available beginning May 2022 | Disney Cruise Line [Member]
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,100
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Credit Facility available beginning April 2023 [Member] | Disney Cruise Line [Member]
Line of Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,100
Debt Instrument, Interest Rate, Stated Percentage	3.70%