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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) $ in Millions	Mar. 31, 2020 USD ($) megawatts	Sep. 30, 2019 USD ($)
Derivative
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,182	$ 1,624
Total derivatives not subject to master netting or similar arrangement	$ 4	$ 12
Long-term Contract for Purchase of Electric Power [Domain]
Derivative
Megawatts | megawatts	440

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Megawatts of summer net capability

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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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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