Discontinued Operations (Financial Results That Have Been Reclassified from Continuing Operations and Included in Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other (Income) and Deductions
Net Income from Discontinued Operations, Net of Taxes	$ 0	$ 65	$ 0	$ 145
Less: Net Income Attributable to Noncontrolling Interests	0	3	0	6
Net Income from Discontinued Operations	$ 0	62	$ 0	139
Transaction costs		19		29
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		208		405
Operating Expenses
Cost of gas and other — non-utility		10		15
Operation and maintenance		53		94
Depreciation and amortization		41		82
Taxes other than income		6		13
Asset (gains) losses and impairments, net		18		17
Operating Expenses		128		221
Operating Income		80		184
Other (Income) and Deductions
Interest expense		24		50
Interest income		(1)		(4)
Other income		(29)		(62)
Other (Income) and Deductions		(6)		(16)
Income from Discontinued Operations Before Income Taxes		86		200
Income Tax Expense		21		55
Net Income from Discontinued Operations, Net of Taxes		65		145
Less: Net Income Attributable to Noncontrolling Interests		3		6
Net Income from Discontinued Operations		$ 62		$ 139