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Dispositions (Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Current Assets Held for Sale    
Total current assets held for sale $ 47 $ 96
Noncurrent Assets Held for Sale    
Total noncurrent assets held for sale 2,106 2,095
Current Liabilities Associated with Assets Held for Sale    
Total current liabilities associated with assets held for sale 57 132
Noncurrent Liabilities Associated with Assets Held for Sale    
Total noncurrent liabilities associated with assets held for sale 167 271
Piedmont    
Current Assets Held for Sale    
Total current assets held for sale 47 92
Noncurrent Assets Held for Sale    
Total noncurrent assets held for sale 1,822 1,722
Current Liabilities Associated with Assets Held for Sale    
Total current liabilities associated with assets held for sale 39 52
Noncurrent Liabilities Associated with Assets Held for Sale    
Total noncurrent liabilities associated with assets held for sale 167 182
Discontinued Operations, Held-for-sale    
Current Assets Held for Sale    
Receivables, net 28 64
Inventory 12 12
Other 7 20
Total current assets held for sale 47 96
Noncurrent Assets Held for Sale    
Cost 2,185 2,178
Accumulated depreciation and amortization (414) (416)
Net property, plant and equipment 1,771 1,762
Goodwill 294 294
Regulatory assets 41 35
Operating lease right-of-use assets, net   4
Total noncurrent assets held for sale 2,106 2,095
Total Assets Held for Sale 2,153 2,191
Current Liabilities Associated with Assets Held for Sale    
Accounts payable 53 61
Taxes accrued   2
Current maturities of long-term debt   43
Unrealized losses on commodity hedges   13
Other 4 13
Total current liabilities associated with assets held for sale 57 132
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations 4 9
Regulatory liabilities 158 173
Operating lease liabilities   5
Unrealized losses on commodity hedges   66
Other 5 18
Total noncurrent liabilities associated with assets held for sale 167 271
Total Liabilities Associated with Assets Held for Sale 224 403
Discontinued Operations, Held-for-sale | Piedmont Tennessee Disposal Group    
Current Assets Held for Sale    
Receivables, net 28 64
Inventory 12 12
Other 7 16
Total current assets held for sale 47 92
Noncurrent Assets Held for Sale    
Cost 2,185 2,069
Accumulated depreciation and amortization (414) (392)
Net property, plant and equipment 1,771 1,677
Goodwill 294 294
Regulatory assets 41 35
Operating lease right-of-use assets, net   0
Total noncurrent assets held for sale 2,106 2,006
Total Assets Held for Sale 2,153 2,098
Current Liabilities Associated with Assets Held for Sale    
Accounts payable 35 42
Taxes accrued   1
Current maturities of long-term debt   0
Unrealized losses on commodity hedges   0
Other 4 9
Total current liabilities associated with assets held for sale 39 52
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations 4 4
Regulatory liabilities 158 173
Operating lease liabilities   0
Unrealized losses on commodity hedges   0
Other 5 5
Total noncurrent liabilities associated with assets held for sale 167 182
Total Liabilities Associated with Assets Held for Sale 206 234
Discontinued Operations, Held-for-sale | Piedmont Tennessee Disposal Group | Piedmont    
Current Assets Held for Sale    
Receivables, net 28 64
Inventory 12 12
Other 7 16
Total current assets held for sale 47 92
Noncurrent Assets Held for Sale    
Cost 2,185 2,069
Accumulated depreciation and amortization (414) (392)
Net property, plant and equipment 1,771 1,677
Goodwill 10 10
Regulatory assets 41 35
Operating lease right-of-use assets, net   0
Total noncurrent assets held for sale 1,822 1,722
Total Assets Held for Sale 1,869 1,814
Current Liabilities Associated with Assets Held for Sale    
Accounts payable 35 42
Taxes accrued   1
Current maturities of long-term debt   0
Unrealized losses on commodity hedges   0
Other 4 9
Total current liabilities associated with assets held for sale 39 52
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations 4 4
Regulatory liabilities 158 173
Operating lease liabilities   0
Unrealized losses on commodity hedges   0
Other 5 5
Total noncurrent liabilities associated with assets held for sale 167 182
Total Liabilities Associated with Assets Held for Sale 206 234
Discontinued Operations, Held-for-sale | Commercial Renewables Disposal Groups    
Current Assets Held for Sale    
Receivables, net 0 0
Inventory 0 0
Other 0 4
Total current assets held for sale 0 4
Noncurrent Assets Held for Sale    
Cost 0 109
Accumulated depreciation and amortization 0 (24)
Net property, plant and equipment 0 85
Goodwill 0 0
Regulatory assets 0 0
Operating lease right-of-use assets, net   4
Total noncurrent assets held for sale 0 89
Total Assets Held for Sale 0 93
Current Liabilities Associated with Assets Held for Sale    
Accounts payable 18 19
Taxes accrued   1
Current maturities of long-term debt   43
Unrealized losses on commodity hedges   13
Other 0 4
Total current liabilities associated with assets held for sale 18 80
Noncurrent Liabilities Associated with Assets Held for Sale    
Asset retirement obligations 0 5
Regulatory liabilities 0 0
Operating lease liabilities   5
Unrealized losses on commodity hedges   66
Other 0 13
Total noncurrent liabilities associated with assets held for sale 0 89
Total Liabilities Associated with Assets Held for Sale $ 18 $ 169