Discontinued Operations (Financial Results That Have Been Reclassified from Continuing Operations and Included in Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other (Income) and Deductions
Net Income from Discontinued Operations, Net of Taxes	$ 0	$ 117	$ 326
Less: Net Income Attributable to Noncontrolling Interests	0	6	12
Net Income from Discontinued Operations	$ 0	111	314
Transaction costs		59	8
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	754
Operating Expenses
Cost of gas and other — non-utility		15	21
Operation and maintenance		123	138
Depreciation and amortization		82	151
Taxes other than income		13	15
Asset (gains) losses and impairments, net		17	(2)
Operating Expenses		250	323
Operating Income		155	431
Other (Income) and Deductions
Interest expense		50	113
Interest income		(4)	(9)
Other income		(62)	(129)
Other (Income) and Deductions		(16)	(25)
Income from Discontinued Operations Before Income Taxes		171	456
Income Tax Expense		54	130
Net Income from Discontinued Operations, Net of Taxes		117	326
Less: Net Income Attributable to Noncontrolling Interests		6	12
Net Income from Discontinued Operations		$ 111	$ 314