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Exit Activities and Discontinued Operations (Income from Discontinued Operations) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale   $ 0 $ 5 $ 657
Income tax expense   0 1 170
Income from discontinued operations, net of tax   $ 1 4 602
Discontinued Operations, Held-for-sale | EnerBank        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating revenue     0 209
Operating expenses     0 60
Interest expense     0 34
Income before income taxes     0 115
Gain on sale $ 657   5 657
Income from discontinued operations before income taxes     5 772
Income tax expense     1 170
Income from discontinued operations, net of tax     $ 4 $ 602