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v3.25.3

Reportable Segments - Schedule of Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | $ 1,988 | $ 1,856 | $ 6,852 | $ 6,381 |
Intersegment revenues |  |  | 0 |  |
Utility natural gas, fuel and purchased power | 219 | 197 | 1,525 | 1,217 |
Non-utility cost of revenues, including natural gas | 1 | 1 | 4 | 2 |
Operation and maintenance expenses | 741 | 775 | 2,203 | 2,162 |
Depreciation and amortization | 392 | 334 | 1,125 | 1,083 |
Taxes other than income taxes | 133 | 125 | 427 | 410 |
Interest expense and other finance charges | 243 | 195 | 676 | 616 |
Income tax expense (benefit) | (7) | 52 | 129 | 163 |
Interest income | 0 | 0 | 0 | 0 |
Other expense (income), net | (27) | (16) | (25) | (43) |
Net income (loss) | 293 | 193 | 788 | 771 |
Interest income from securitization bonds (less than for 2025) | 1 | 1 | 1 | 3 |
Expenditures for Long-lived Assets |  |  | 3,730 | 2,766 |
Total Assets | 45,049 |  | 45,049 |  | $ 43,768
Natural Gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 622 | 611 | 3,224 | 2,876 |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 1 | 2 | 6 | 6 |
Corporate and Other | Pension and Other Postretirement Plans Costs |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Regulatory assets | 365 |  | 365 |  | 384
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 1,988 | 1,856 | 6,852 | 6,381 |
Intersegment revenues |  |  | 2 |  |
Utility natural gas, fuel and purchased power | 219 | 197 | 1,527 | 1,217 |
Non-utility cost of revenues, including natural gas | 1 | 1 | 4 | 2 |
Operation and maintenance expenses | 741 | 775 | 2,203 | 2,162 |
Depreciation and amortization | 392 | 334 | 1,125 | 1,083 |
Taxes other than income taxes | 133 | 125 | 427 | 410 |
Interest expense and other finance charges | 249 | 202 | 703 | 640 |
Income tax expense (benefit) | (7) | 52 | 129 | 163 |
Interest income | (6) | (7) | (27) | (24) |
Other expense (income), net | (27) | (16) | (25) | (43) |
Net income (loss) | 293 | 193 | 788 | 771 |
Operating Segments | Electric |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 1,365 | 1,243 | 3,622 | 3,499 |
Intersegment revenues |  |  | 0 |  |
Utility natural gas, fuel and purchased power | 72 | 58 | 211 | 151 |
Non-utility cost of revenues, including natural gas | 0 | 0 | 0 | 0 |
Operation and maintenance expenses | 520 | 560 | 1,527 | 1,532 |
Depreciation and amortization | 247 | 201 | 687 | 664 |
Taxes other than income taxes | 82 | 73 | 240 | 228 |
Interest expense and other finance charges | 116 | 88 | 323 | 276 |
Income tax expense (benefit) | 56 | 53 | 122 | 131 |
Interest income | (1) | (4) | (12) | (15) |
Other expense (income), net | (20) | (12) | (48) | (30) |
Net income (loss) | 293 | 226 | 572 | 562 |
Expenditures for Long-lived Assets |  |  | 2,534 | 1,643 |
Total Assets | 26,338 |  | 26,338 |  | 23,936
Operating Segments | Natural Gas |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 622 | 611 | 3,224 | 2,876 |
Intersegment revenues |  |  | 2 |  |
Utility natural gas, fuel and purchased power | 147 | 139 | 1,316 | 1,066 |
Non-utility cost of revenues, including natural gas | 1 | 2 | 4 | 3 |
Operation and maintenance expenses | 219 | 214 | 679 | 637 |
Depreciation and amortization | 139 | 129 | 423 | 403 |
Taxes other than income taxes | 53 | 51 | 183 | 177 |
Interest expense and other finance charges | 52 | 40 | 154 | 152 |
Income tax expense (benefit) | (54) | 9 | 62 | 88 |
Interest income | 0 | (1) | (10) | (2) |
Other expense (income), net | (6) | (2) | 30 | (8) |
Net income (loss) | 71 | 30 | 385 | 360 |
Expenditures for Long-lived Assets |  |  | 1,164 | 1,115 |
Total Assets | 17,553 |  | 17,553 |  | 18,583
Operating Segments | Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 1 | 2 | 6 | 6 |
Intersegment revenues |  |  | 0 |  |
Utility natural gas, fuel and purchased power | 0 | 0 | 0 | 0 |
Non-utility cost of revenues, including natural gas | 0 | (1) | 0 | (1) |
Operation and maintenance expenses | 2 | 1 | (3) | (7) |
Depreciation and amortization | 6 | 4 | 15 | 16 |
Taxes other than income taxes | (2) | 1 | 4 | 5 |
Interest expense and other finance charges | 81 | 74 | 226 | 212 |
Income tax expense (benefit) | (9) | (10) | (55) | (56) |
Interest income | (5) | (2) | (5) | (7) |
Other expense (income), net | (1) | (2) | (7) | (5) |
Net income (loss) | (71) | (63) | (169) | (151) |
Expenditures for Long-lived Assets |  |  | 32 | 8 |
Total Assets | 1,158 |  | 1,158 |  | $ 1,249
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers | 0 | 0 | 0 | 0 |
Intersegment revenues |  |  | (2) |  |
Utility natural gas, fuel and purchased power | 0 | 0 | (2) | 0 |
Non-utility cost of revenues, including natural gas | 0 | 0 | 0 | 0 |
Operation and maintenance expenses | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Taxes other than income taxes | 0 | 0 | 0 | 0 |
Interest expense and other finance charges | (6) | (7) | (27) | (24) |
Income tax expense (benefit) | 0 | 0 | 0 | 0 |
Interest income | (6) | (7) | (27) | (24) |
Other expense (income), net | 0 | 0 | 0 | 0 |
Net income (loss) | $ 0 | $ 0 | $ 0 | $ 0 |

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