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Nonconsolidated Partially-Owned Affiliates - (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Sep. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Investments in partially-owned affiliates		$ 707		$ 707	$ 1,399
Impairment of nonconsolidated partially owned affiliate				$ 231	$ 0	$ 358
Significant Unobservable Inputs (Level 3) | Valuation, income approach | Measurement input, cap rate
Schedule of Equity Method Investments [Line Items]
Reporting unit, measurement input			12.50%			13.00%
YFAI
Schedule of Equity Method Investments [Line Items]
% ownership	30.00%	0.00%		0.00%	30.00%
Payments to acquire equity method investments	$ 369
Impairment of nonconsolidated partially owned affiliate			$ 358	$ 231		$ 358
YFAI | Significant Unobservable Inputs (Level 3) | Valuation, income approach | Measurement input, cap rate
Schedule of Equity Method Investments [Line Items]
Reporting unit, measurement input		15.00%

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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