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Debt and Credit Agreements - Summary of Outstanding Long-term Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jul. 19, 2024	Jul. 18, 2024
Debt Instrument [Line Items]
Amount	$ 900	$ 3,192
Amount	(99)	$ (150)
Total long-term debt issued (redeemed)	$ 802
Green Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.75%
Amount	$ 900
Energy Efficiency Project Financing
Debt Instrument [Line Items]
Amount	$ 1
Minimum | Energy Efficiency Project Financing
Debt Instrument [Line Items]
Interest Rate	2.20%
Maximum | Energy Efficiency Project Financing
Debt Instrument [Line Items]
Interest Rate	4.96%
Nonrecourse | CR Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	2.25%		2.25%	2.76%
Amount	$ (22)
Nonrecourse | Continental Wind Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	6.00%
Amount	$ (28)
Nonrecourse | West Medway II Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	3.225%
Amount	$ (25)
Nonrecourse | Antelope Valley DOE Nonrecourse Debt
Debt Instrument [Line Items]
Amount	$ (15)
Nonrecourse | RPG Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	4.11%
Amount	$ (9)
Nonrecourse | Minimum | Antelope Valley DOE Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	2.29%
Nonrecourse | Maximum | Antelope Valley DOE Nonrecourse Debt
Debt Instrument [Line Items]
Interest Rate	3.56%

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