v3.26.1
Dispositions (Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Total current assets held for sale $ 0 $ 109
Noncurrent Assets Held for Sale    
Total noncurrent assets held for sale 0 2,148
Current Liabilities Associated with Assets Held for Sale    
Total current liabilities associated with assets held for sale   84
Noncurrent Liabilities Associated with Assets Held for Sale    
Total noncurrent liabilities associated with assets held for sale $ 0 170
Piedmont    
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Total current assets held for sale   109
Noncurrent Assets Held for Sale    
Total noncurrent assets held for sale   1,864
Current Liabilities Associated with Assets Held for Sale    
Total current liabilities associated with assets held for sale   66
Noncurrent Liabilities Associated with Assets Held for Sale    
Total noncurrent liabilities associated with assets held for sale   170
Held-for-Sale    
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Receivables, net   82
Inventory   12
Other   15
Total current assets held for sale   109
Noncurrent Assets Held for Sale    
Cost   2,219
Accumulated depreciation and amortization   (406)
Net property, plant and equipment   1,813
Goodwill   294
Regulatory assets   41
Total noncurrent assets held for sale   2,148
Disposal Group, Including Discontinued Operation, Assets, Total   2,257
Current Liabilities Associated with Assets Held for Sale    
Accounts payable   76
Other   8
Total current liabilities associated with assets held for sale   84
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations   4
Regulatory liabilities   161
Other   5
Total noncurrent liabilities associated with assets held for sale   170
Total Liabilities Associated with Assets Held for Sale   254
Held-for-Sale | Piedmont Tennessee Disposal Group    
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Receivables, net   82
Inventory   12
Other   15
Total current assets held for sale   109
Noncurrent Assets Held for Sale    
Cost   2,219
Accumulated depreciation and amortization   (406)
Net property, plant and equipment   1,813
Goodwill   294
Regulatory assets   41
Total noncurrent assets held for sale   2,148
Disposal Group, Including Discontinued Operation, Assets, Total   2,257
Current Liabilities Associated with Assets Held for Sale    
Accounts payable   58
Other   8
Total current liabilities associated with assets held for sale   66
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations   4
Regulatory liabilities   161
Other   5
Total noncurrent liabilities associated with assets held for sale   170
Total Liabilities Associated with Assets Held for Sale   236
Held-for-Sale | Piedmont Tennessee Disposal Group | Piedmont    
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Receivables, net   82
Inventory   12
Other   15
Total current assets held for sale   109
Noncurrent Assets Held for Sale    
Cost   2,219
Accumulated depreciation and amortization   (406)
Net property, plant and equipment   1,813
Goodwill   10
Regulatory assets   41
Total noncurrent assets held for sale   1,864
Disposal Group, Including Discontinued Operation, Assets, Total   1,973
Current Liabilities Associated with Assets Held for Sale    
Accounts payable   58
Other   8
Total current liabilities associated with assets held for sale   66
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations   4
Regulatory liabilities   161
Other   5
Total noncurrent liabilities associated with assets held for sale   170
Total Liabilities Associated with Assets Held for Sale   236
Held-for-Sale | Commercial Renewables Disposal Groups    
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]    
Receivables, net   0
Inventory   0
Other   0
Total current assets held for sale   0
Noncurrent Assets Held for Sale    
Cost   0
Accumulated depreciation and amortization   0
Net property, plant and equipment   0
Goodwill   0
Regulatory assets   0
Total noncurrent assets held for sale   0
Disposal Group, Including Discontinued Operation, Assets, Total   0
Current Liabilities Associated with Assets Held for Sale    
Accounts payable   18
Other   0
Total current liabilities associated with assets held for sale   18
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations   0
Regulatory liabilities   0
Other   0
Total noncurrent liabilities associated with assets held for sale   0
Total Liabilities Associated with Assets Held for Sale   $ 18