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Condensed Consolidated Statements of Operations and Comprehensive Income - Piedmont - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Regulated natural gas $ 361 $ 298 $ 1,928 $ 1,511
Nonregulated electric and other 75 81 233 233
Total operating revenues 8,542 8,154 24,299 22,997
Operating Expenses        
Operation, maintenance and other 1,762 1,409 4,916 4,108
Depreciation and amortization 1,626 1,516 4,721 4,312
Property and other taxes 438 383 1,281 1,162
Total operating expenses 6,225 6,017 17,829 17,208
Operating (Loss) Income 2,334 2,144 6,507 5,814
Other Income and Expenses        
Equity in earnings of unconsolidated affiliates 16 15 38 53
Other income and expenses, net 182 166 497 502
Total other income and expenses 198 181 535 555
Interest Expense 902 872 2,688 2,513
Income From Continuing Operations Before Income Taxes 1,630 1,453 4,354 3,856
Income Tax Expense From Continuing Operations 176 163 488 481
Net Income 1,421 1,281 3,784 3,319
Comprehensive Income 1,429 1,261 3,815 3,441
Piedmont        
Regulated natural gas 265 213 1,443 1,119
Nonregulated electric and other 6 6 20 20
Total operating revenues 271 219 1,463 1,139
Operating Expenses        
Cost of natural gas 98 52 494 280
Operation, maintenance and other 102 87 301 267
Depreciation and amortization 69 65 210 191
Property and other taxes 19 16 56 47
Total operating expenses 288 220 1,061 785
Operating (Loss) Income (17) (1) 402 354
Other Income and Expenses        
Equity in earnings of unconsolidated affiliates 3 2 6 6
Other income and expenses, net 12 12 34 42
Total other income and expenses 15 14 40 48
Interest Expense 48 47 143 135
Income From Continuing Operations Before Income Taxes (50) (34) 299 267
Income Tax Expense From Continuing Operations (12) (10) 56 49
Net Income (38) (24) 243 218
Comprehensive Income $ (38) $ (24) $ 243 $ 218