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Dispositions (Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Current Assets Held for Sale      
Total current assets held for sale $ 109   $ 96
Noncurrent Assets Held for Sale      
Total noncurrent assets held for sale 2,148   2,095
Current Liabilities Associated with Assets Held for Sale      
Total current liabilities associated with assets held for sale 84   132
Noncurrent Liabilities Associated with Assets Held for Sale      
Total noncurrent liabilities associated with assets held for sale 170   271
Piedmont      
Current Assets Held for Sale      
Total current assets held for sale 109   92
Noncurrent Assets Held for Sale      
Total noncurrent assets held for sale 1,864   1,722
Current Liabilities Associated with Assets Held for Sale      
Total current liabilities associated with assets held for sale 66   52
Noncurrent Liabilities Associated with Assets Held for Sale      
Total noncurrent liabilities associated with assets held for sale 170   182
Discontinued Operations, Held-for-sale      
Current Assets Held for Sale      
Receivables, net 82   64
Inventory 12   12
Other 15   20
Total current assets held for sale 109   96
Noncurrent Assets Held for Sale      
Cost 2,219   2,178
Accumulated depreciation and amortization (406)   (416)
Net property, plant and equipment 1,813   1,762
Goodwill 294   294
Regulatory assets 41   35
Operating lease right-of-use assets, net     4
Total noncurrent assets held for sale 2,148   2,095
Total Assets Held for Sale 2,257   2,191
Current Liabilities Associated with Assets Held for Sale      
Accounts payable 76   61
Taxes accrued     2
Current maturities of long-term debt     43
Unrealized losses on commodity hedges     13
Other 8   13
Total current liabilities associated with assets held for sale 84   132
Noncurrent Liabilities Associated with Assets Held for Sale      
Operating lease liabilities     5
Asset retirement obligations 4   9
Regulatory liabilities 161   173
Disposal Group, Including Discontinued Operation, Unrealized Losses On Commodity Hedges, Noncurrent     66
Other 5   18
Total noncurrent liabilities associated with assets held for sale 170   271
Total Liabilities Associated with Assets Held for Sale 254   403
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      
Operating lease liabilities     5
Asset retirement obligations 0   5
Regulatory liabilities 0   0
Disposal Group, Including Discontinued Operation, Unrealized Losses On Commodity Hedges, Noncurrent     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
Discontinued Operations, Held-for-sale | Piedmont Tennessee Disposal Group      
Current Assets Held for Sale      
Receivables, net 82   64
Inventory 12   12
Other 15   16
Total current assets held for sale 109   92
Noncurrent Assets Held for Sale      
Cost 2,219   2,069
Accumulated depreciation and amortization (406)   (392)
Net property, plant and equipment 1,813   1,677
Goodwill 294 $ 294 294
Regulatory assets 41   35
Operating lease right-of-use assets, net     0
Total noncurrent assets held for sale 2,148   2,006
Total Assets Held for Sale 2,257   2,098
Current Liabilities Associated with Assets Held for Sale      
Accounts payable 58   42
Taxes accrued     1
Current maturities of long-term debt     0
Unrealized losses on commodity hedges     0
Other 8   9
Total current liabilities associated with assets held for sale 66   52
Noncurrent Liabilities Associated with Assets Held for Sale      
Operating lease liabilities     0
Asset retirement obligations 4   4
Regulatory liabilities 161   173
Disposal Group, Including Discontinued Operation, Unrealized Losses On Commodity Hedges, Noncurrent     0
Other 5   5
Total noncurrent liabilities associated with assets held for sale 170   182
Total Liabilities Associated with Assets Held for Sale 236   234
Discontinued Operations, Held-for-sale | Piedmont | Piedmont Tennessee Disposal Group      
Current Assets Held for Sale      
Receivables, net 82   64
Inventory 12   12
Other 15   16
Total current assets held for sale 109   92
Noncurrent Assets Held for Sale      
Cost 2,219   2,069
Accumulated depreciation and amortization (406)   (392)
Net property, plant and equipment 1,813   1,677
Goodwill 10   10
Regulatory assets 41   35
Operating lease right-of-use assets, net     0
Total noncurrent assets held for sale 1,864   1,722
Total Assets Held for Sale 1,973   1,814
Current Liabilities Associated with Assets Held for Sale      
Accounts payable 58   42
Taxes accrued     1
Current maturities of long-term debt     0
Unrealized losses on commodity hedges     0
Other 8   9
Total current liabilities associated with assets held for sale 66   52
Noncurrent Liabilities Associated with Assets Held for Sale      
Operating lease liabilities     0
Asset retirement obligations 4   4
Regulatory liabilities 161   173
Disposal Group, Including Discontinued Operation, Unrealized Losses On Commodity Hedges, Noncurrent     0
Other 5   5
Total noncurrent liabilities associated with assets held for sale 170   182
Total Liabilities Associated with Assets Held for Sale $ 236   $ 234