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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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