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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended			12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021	Sep. 30, 2023	Aug. 01, 2022	Sep. 30, 2021
Subsequent Event [Line Items]
Redemptions and repurchases of power bonds			$ 28	[1]	$ 1,860
Increase/Decrease in Interest Rate Swap Liability	$ 115		115
Current regulatory assets	389		389					$ 196
Operating and maintenance	722	$ 747	2,269		2,106
Interest expense	264	$ 267	791		$ 824
Non-current regulatory assets	7,789		7,789					7,956
Regulatory Liability, Noncurrent	88		88					40
Commodity Contract under FHP
Subsequent Event [Line Items]
Derivative Liability, Fair Value of Collateral	10		10
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Regulatory Liability, Noncurrent	88		88					40
Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Current regulatory assets	14		14					3
Non-current regulatory assets	$ 5		$ 5					$ 0
Forecast
Subsequent Event [Line Items]
Fuel and purchased power						$ 4,600
Base Capital spend						1,000
Operating and maintenance						3,300
Interest expense						1,100
Debt limit						$ 2,000
Forecast | Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Regulatory Liability, Noncurrent							$ 100
Forecast | DeferredDerivativeGainLossUnderFHP
Subsequent Event [Line Items]
Regulatory Liability, Noncurrent							150
Forecast | Unrealized gains/losses on commodity derivatives
Subsequent Event [Line Items]
Non-current regulatory assets							1
Forecast | DeferredDerivativeGainLossUnderFHP
Subsequent Event [Line Items]
Non-current regulatory assets							$ 10
[1] (1) All redemptions were at 100 percent of par.

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