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Debt and Other Obligations Debt and Other Obligations - Lease/Leasebacks (Details) - USD ($) $ in Millions	12 Months Ended		348 Months Ended
	Sep. 30, 2053	Sep. 30, 2023	Sep. 30, 2052
Lagoon Creek [Member]
Sale Leaseback Transaction [Line Items]
Amortization of reacquired rights		$ 3
Lagoon Creek [Member] | Scenario, Forecast
Sale Leaseback Transaction [Line Items]
Amortization of reacquired rights	$ 2		$ 5
Kemper/Lagoon Creek Leasehold Interests
Sale Leaseback Transaction [Line Items]
Leasehold Interests		155
Lagoon Creek [Member]
Sale Leaseback Transaction [Line Items]
Leasehold Interests		78
Kemper [Member]
Sale Leaseback Transaction [Line Items]
Leasehold Interests		$ 77

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- Definition

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+ References

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- Definition

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+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481295/840-40-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479741/842-40-50-2

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