Segment Reporting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting [Abstract]
Assets	$ 12,544	$ 11,208	$ 10,459
Net income	313	228	233
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	350	273	272
Costs and Expenses	2,928	2,527	2,250
Operating Income (Loss)	512	396	397
Operating Expenses	839	715	688
Interest Expense, Debt	226	186	163
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest	$ (15)	$ (13)	$ (7)