Discontinued Operations (Financial Results That Have Been Reclassified from Continuing Operations and Included in Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other (Income) and Deductions
Net Income (Loss) from Discontinued Operations, Net of Taxes	$ 0	$ (33)	$ 0	$ 112
Less: Net Income Attributable to Noncontrolling Interests	0	0	0	6
Net Income (Loss) from Discontinued Operations	$ 0	(33)	$ 0	106
Transaction costs		30		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		0		405
Operating Expenses
Cost of gas and other — non-utility		0		15
Operation and maintenance		30		124
Depreciation and amortization		0		82
Taxes other than income		0		13
Asset (gains) losses and impairments, net		0		17
Operating Expenses		30		251
Operating Income (Loss)		(30)		154
Other (Income) and Deductions
Interest expense		0		50
Interest income		0		(4)
Other income		0		(62)
Other (Income) and Deductions		0		(16)
Income (Loss) from Discontinued Operations Before Income Taxes		(30)		170
Income Tax Expense		3		58
Net Income (Loss) from Discontinued Operations, Net of Taxes		(33)		112
Less: Net Income Attributable to Noncontrolling Interests		0		6
Net Income (Loss) from Discontinued Operations		$ (33)		$ 106