Business, Significant Accounting Policies, Significant Events, and Recent Developments - Schedule of Insurance Recoveries (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jul. 31, 2025 MW	Mar. 31, 2025 USD ($) MW	Jan. 16, 2025 MW	Dec. 31, 2024 USD ($)
Line of Credit Facility [Line Items]
Write-off of net book value of facility to depreciation and amortization	$ 0	$ 400
Interest costs incurred	4	24
Total incident expense	4	526
Insurance Settlements Receivable
Property damage insurance receivable as of the beginning of the period	324	0
Recovery of incident expense recorded to insurance receivable	4	449
Insurance recovery gain recorded in other non-operating income, net	0	80
Insurance proceeds received	(27)	(228)
Property damage insurance receivable as of the end of the period	301	301
Total incident expense, net of property damage insurance recoveries	0	77
Other current liabilities	687	687				$ 645
ASAOC
Line of Credit Facility [Line Items]
Interest costs incurred	0	102
Insurance Settlements Receivable
Total costs		110
Moss Landing Incident
Line of Credit Facility [Line Items]
Write-off of net book value of facility to depreciation and amortization	0	400
Interest costs incurred	0	0
Total incident expense	0	502
Insurance Settlements Receivable
Property damage insurance receivable as of the beginning of the period	304	0
Recovery of incident expense recorded to insurance receivable	0	425
Insurance recovery gain recorded in other non-operating income, net	0	0
Insurance proceeds received	(7)	(128)
Property damage insurance receivable as of the end of the period	297	297
Total incident expense, net of property damage insurance recoveries	0	77
Other current liabilities				$ 8
Moss Landing Incident | ASAOC
Line of Credit Facility [Line Items]
Interest costs incurred	0	102
Insurance Settlements Receivable
Total costs		110
Other current liabilities	68	68
Moss Landing Incident | Moss Landing Battery Energy Storage System Phase I
Insurance Settlements Receivable
Battery energy storage system capacity | MW			300	300	300
Martin Lake Incident
Line of Credit Facility [Line Items]
Write-off of net book value of facility to depreciation and amortization	0	0
Interest costs incurred	4	24
Total incident expense	4	24
Insurance Settlements Receivable
Property damage insurance receivable as of the beginning of the period	20	0
Recovery of incident expense recorded to insurance receivable	4	24
Insurance recovery gain recorded in other non-operating income, net	0	80
Insurance proceeds received	(20)	(100)
Property damage insurance receivable as of the end of the period	4	4
Total incident expense, net of property damage insurance recoveries	0	0
Martin Lake Incident | ASAOC
Line of Credit Facility [Line Items]
Interest costs incurred	$ 0	$ 0