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Debt and Other Obligations Lease/Leaseback Obligations (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Sale Leaseback Transaction [Line Items]
CT and QTE outstanding leaseback obligation	$ 4	$ 25
Leasing transaction, number of units		16
Leasing transaction, number of units		16
CT and QTE outstanding leaseback obligation	4	$ 25
Kemper/Lagoon Creek leasehold interests
Sale Leaseback Transaction [Line Items]
leasehold interest	155
leasehold interest	$ 155
Kemper/Lagoon Creek leasehold interests
Sale Leaseback Transaction [Line Items]
Leasing transaction, number of units		8
Leasing transaction, number of units		8