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Risk Management Activities and Derivative Transactions Counterparty Credit Risk (Details) $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($) megawatts	Sep. 30, 2020 USD ($)
Derivative
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,242	$ 1,401
Total derivatives not subject to master netting or similar arrangement	$ 25	$ 49
Two Largest Customer Percentage of Total Operating Revenue	1600.00%
Moody's, A1 Rating [Member]
Derivative
Banking Counterparties Credit Rating	A3
Natural Gas Banking Counterparties Credit Rating	A2
Moody's, Caa1 Rating [Member]
Derivative
Natural Gas Banking Counterparties Credit Rating	B1
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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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.

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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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