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Condensed Consolidated Statements of Operations and Comprehensive Income - Piedmont - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Regulated natural gas $ 2,870 $ 2,252 $ 2,152
Nonregulated electric and other 307 318 291
Total operating revenues 32,237 30,357 29,060
Operating Expenses      
Operation, maintenance and other 6,698 5,389 5,625
Depreciation and amortization 6,324 5,793 5,253
Property and other taxes 1,597 1,466 1,400
Impairment of assets and other charges (4) 38 85
Total operating expenses 23,656 22,457 22,042
Operating Income 8,626 7,926 7,070
Equity in earnings (losses) of unconsolidated affiliates 51 (9) 113
Other income and expenses, net 669 661 598
Total other income and expenses 720 652 711
Interest Expense 3,634 3,384 3,014
Income From Continuing Operations Before Income Taxes 5,712 5,194 4,767
Income Tax Expense From Continuing Operations 642 590 438
Net Income 4,968 4,524 2,841
Comprehensive Income 4,938 4,758 2,975
Piedmont      
Regulated natural gas 2,209 1,702 1,603
Nonregulated electric and other 28 27 25
Total operating revenues 2,237 1,729 1,628
Operating Expenses      
Cost of natural gas 784 423 430
Operation, maintenance and other 408 359 344
Depreciation and amortization 282 261 237
Property and other taxes 67 55 59
Impairment of assets and other charges 0 0 (4)
Total operating expenses 1,541 1,098 1,066
Operating Income 696 631 562
Equity in earnings (losses) of unconsolidated affiliates 8 8 9
Other income and expenses, net 41 54 57
Total other income and expenses 49 62 66
Interest Expense 193 185 165
Income From Continuing Operations Before Income Taxes 552 508 463
Income Tax Expense From Continuing Operations 112 95 84
Net Income 440 413 379
Comprehensive Income $ 440 $ 413 $ 379