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Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segment Reporting [Abstract]
Revenues	$ 928	$ 929
Purchased power and fuel	368	405
Generation, transmission and distribution	110	99
Administrative and other	96	95
Operating Expenses	206	194
Depreciation and amortization	140	121
Taxes other than income taxes	46	47
Costs and Expenses	760	767
Operating Income (Loss)	168	162
Interest Expense, Debt	60	55
Allowance for Funds Used During Construction, Capitalized Interest	(4)	(4)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	122	122
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	100	109
Assets	12,695	11,588	$ 12,544
Payments to Acquire Property, Plant, and Equipment	$ (359)	$ (325)

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