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Asset Acquisitions and Business Combinations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 20, 2017
Business Combinations and Settlement of Preexisting Relationships [Abstract]
Percentage equity interests acquired			100.00%
Total cash consideration	$ 36
Fair value of assets acquired			$ 110
Fair value of liabilities assumed		$ 78	74
Amortization expense of SPE's acquired	1
Loss on extinguishment	$ 3
Lease/leaseback obligations settled			71
Reacquisition price			$ 74

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- Definition

Business Combinations and Settlement of Preexisting Relationships [Abstract]

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Carrying value of lease/leaseback obligations settled

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Reacquisition price of lease/leaseback obligations

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of assets acquired at the acquisition date.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.

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The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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