Discontinued Operations (Financial Results of Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other (Income) and Deductions
Net Income from Discontinued Operations, Net of Taxes	$ 0	$ 0	$ 117
Less: Net Income Attributable to Noncontrolling Interests	0	0	6
Net Income from Discontinued Operations	$ 0	$ 0	111
Transaction costs			59
DT Midstream | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Revenues — Non-utility operations			405
Operating Expenses
Cost of gas and other — non-utility			15
Operation and maintenance			123
Depreciation and amortization			82
Taxes other than income			13
Asset (gains) losses and impairments, net			17
Operating Expenses			250
Operating Income			155
Other (Income) and Deductions
Interest expense			50
Interest income			(4)
Other income			(62)
Other (Income) and Deductions			(16)
Income from Discontinued Operations Before Income Taxes			171
Income Tax Expense			54
Net Income from Discontinued Operations, Net of Taxes			117
Less: Net Income Attributable to Noncontrolling Interests			6
Net Income from Discontinued Operations			$ 111