Borrowing Activity (Details) $ in Millions	9 Months Ended
	Jun. 30, 2018 USD ($)
Borrowings [Roll Forward]
Borrowings beginning balance	$ 25,291
Borrowings	8,285
Payments	(9,713)
Other Activity	(190)
Borrowings ending balance	23,673
Commercial paper with original maturities less than three months
Borrowings [Roll Forward]
Borrowings beginning balance	1,151
Borrowings	0	[1]
Payments	(1,098)	[1]
Other Activity	(3)
Borrowings ending balance	50
Commercial paper with original maturities greater than three months
Borrowings [Roll Forward]
Borrowings beginning balance	1,621
Borrowings	7,229
Payments	(5,678)
Other Activity	11
Borrowings ending balance	3,183
U.S. and European medium-term notes
Borrowings [Roll Forward]
Borrowings beginning balance	19,721
Borrowings	0
Payments	(1,300)
Other Activity	16
Borrowings ending balance	18,437
BAMTech Notes Payable
Borrowings [Roll Forward]
Borrowings beginning balance	1,581
Borrowings	0
Payments	(1,581)
Other Activity	0
Borrowings ending balance	0
Asia International Theme Parks borrowings
Borrowings [Roll Forward]
Borrowings beginning balance	1,145
Borrowings	0
Payments	0
Other Activity	37
Borrowings ending balance	1,182
Foreign currency denominated debt and other
Borrowings [Roll Forward]
Borrowings beginning balance	72
Borrowings	1,056
Payments	(56)
Other Activity	(251)	[2]
Borrowings ending balance	$ 821

[1] Borrowings and payments are reported net.

[2] The other activity is primarily market value adjustments for debt with qualifying hedges.