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Business, Significant Accounting Policies, Significant Events, and Recent Developments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) segment MW	Apr. 01, 2025 USD ($)	Jan. 16, 2025 facility	Dec. 31, 2024 USD ($)
Line of Credit Facility [Line Items]
Number of reportable segments \| segment	5
Property, plant and equipment — net	$ 17,716			$ 18,173
Facility limit	8,723
Line of Credit
Line of Credit Facility [Line Items]
Facility limit	5,909
Baldwin Term Loan \| Term Loan \| Subsequent Event
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 75
Coffeen Term Loan \| Term Loan \| Subsequent Event
Line of Credit Facility [Line Items]
Debt instrument, face amount		46
Construction/Term Loan Facility Commitments \| Line of Credit \| Secured Debt
Line of Credit Facility [Line Items]
Facility limit	$ 108
Construction/Term Loan Facility Commitments \| Line of Credit \| Subsequent Event \| Secured Debt
Line of Credit Facility [Line Items]
Facility limit		$ 108
Moss Landing Power Plant (Battery Storage Project) \| Moss Landing Battery Energy Storage System Phase I
Line of Credit Facility [Line Items]
Battery energy storage system capacity \| MW	300
Depreciation expense	$ 400
Estimated liability costs incurred	7
Environmental remediation obligation	70
Environmental remediation obligation related to pollution monitoring	30
Environmental remediation obligation including battery removal and land remediation	40
Insurance settlements, limit amount	500
Insurance settlements receivable	$ 425
Moss Landing Power Plant (Battery Storage Project) \| Moss Landing Battery Energy Storage System Phases II and III
Line of Credit Facility [Line Items]
Number of battery facilities \| facility			2
Moss Landing Power Plant (Battery Storage Project) \| Moss Landing Battery Energy Storage System Phase III
Line of Credit Facility [Line Items]
Battery energy storage system capacity \| MW	350
Moss Landing Power Plant (Battery Storage Project) \| Moss Landing Battery Energy Storage System Phase II
Line of Credit Facility [Line Items]
Battery energy storage system capacity \| MW	100
Property, plant and equipment — net	$ 170