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Condensed Consolidated Statements of Operations and Comprehensive Income - Piedmont - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Nonregulated electric and other $ 80 $ 73
Regulated natural gas 1,105 866
Total operating revenues 8,249 7,671
Operating Expenses    
Operation, maintenance and other 1,499 1,380
Depreciation and amortization 1,512 1,387
Property and other taxes 428 386
Total operating expenses 5,912 5,720
Operating Income 2,343 1,963
Other Income and Expenses    
Equity in earnings of unconsolidated affiliates 11 17
Other income and expenses, net 132 169
Total other income and expenses 143 186
Interest Expense 889 817
Income From Continuing Operations Before Income Taxes 1,597 1,332
Income Tax Expense From Continuing Operations 193 178
Net Income Attributable to Duke Energy Corporation 1,379 1,138
Comprehensive Income Attributable to Duke Energy 1,345 1,253
Piedmont    
Nonregulated electric and other 7 7
Regulated natural gas 850 669
Total operating revenues 857 676
Operating Expenses    
Cost of natural gas 272 170
Operation, maintenance and other 96 95
Depreciation and amortization 70 62
Property and other taxes 18 15
Total operating expenses 456 342
Operating Income 401 334
Other Income and Expenses    
Equity in earnings of unconsolidated affiliates 2 2
Other income and expenses, net 11 15
Total other income and expenses 13 17
Interest Expense 47 45
Income From Continuing Operations Before Income Taxes 367 306
Income Tax Expense From Continuing Operations 76 60
Net Income Attributable to Duke Energy Corporation 291 246
Comprehensive Income Attributable to Duke Energy $ 291 $ 246