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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

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