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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2022 USD ($) Customers	Sep. 30, 2021 USD ($)
Derivative
Accounts Receivable, before Allowance for Credit Loss, Current | $	$ 1,277	$ 1,277	$ 1,480
Total derivatives not subject to master netting or similar arrangement | $	$ 209	$ 209	$ 250
Two Largest Customer Percentage of Total Operating Revenue	1600.00%
Moody's, A1 Rating [Member]
Derivative
Banking Counterparties Credit Rating		A2
Natural Gas Banking Counterparties Credit Rating		A1
Moody's, Caa1 Rating [Member]
Derivative
Natural Gas Banking Counterparties Credit Rating		B1
Credit of Customers
Derivative
Number of customers that represent the percent of sales | Customers		2
Number of customers that represent the percent of sales | Customers		2

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Number of customers that represent the percent of sales

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

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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.

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