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Segments and Related Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Investment in subsidiaries | $ 246 | $ 244 |  |
Natural Gas | 2,230 | 2,645 |  | $ 3,080
Other | 64 | 115 |  | 107
Revenues Including Intersegment Revenues | 13,401 | 14,096 |  | 15,207
Regulated and Unregulated Operating Revenue | 13,441 | 14,206 |  | 15,310
Depreciation and amortization | 2,744 | 2,448 |  | 2,413
Interest charges and financing costs | 1,182 | 1,004 |  | 925
Total income tax benefit | (402) | (146) |  | (135)
Net income (loss) | 1,936 | 1,771 |  | 1,736
Electric fuel and purchased power | 3,788 | 4,278 |  | 5,005
Cost of natural gas sold and transported | 951 | 1,456 |  | 1,910
Operating and maintenance expenses | 2,540 | 2,444 |  | 2,491
Other income (expense), net | 143 | 22 |  | (13)
Electric | 11,147 | 11,446 |  | 12,123
Regulated Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues Including Intersegment Revenues | 11,149 | 11,448 |  | 12,125
Regulated Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues Including Intersegment Revenues | 2,252 | 2,648 |  | 3,082
All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net income (loss) | (147) | (134) |  | (159)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 2,730 | 2,434 |  | 2,398
Interest charges and financing costs | 880 | 766 |  | 722
Total income tax benefit | (358) | (85) |  | (94)
Net income (loss) | 2,083 | 1,905 |  | 1,895
Regulated Operating Revenue | (13,377) | (14,091) |  | (15,203)
Electric fuel and purchased power | 3,788 | 4,278 |  | 5,005
Cost of natural gas sold and transported | 951 | 1,456 |  | 1,910
Operating and maintenance expenses | 2,511 | 2,397 |  | 2,439
Other income (expense), net | 816 | 945 | [1] | 932
Operating Segments [Member] | Regulated Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 2,373 | 2,111 |  | 2,122
Interest charges and financing costs | 767 | 670 |  | 636
Total income tax benefit | (420) | (135) |  | (162)
Net income (loss) | 1,846 | 1,686 |  | 1,631
Electric fuel and purchased power | 3,788 | 4,278 |  | 5,005
Cost of natural gas sold and transported | 0 | 0 |  | 0
Operating and maintenance expenses | 2,102 | 2,011 |  | 2,069
Other income (expense), net | 693 | 827 | [1] | 824
Electric | 11,147 | 11,446 |  | 12,123
Operating Segments [Member] | Regulated Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Natural Gas | 2,230 | 2,645 |  | 3,080
Depreciation and amortization | 357 | 323 |  | 276
Interest charges and financing costs | 113 | 96 |  | 86
Total income tax benefit | 62 | 50 |  | 68
Net income (loss) | 237 | 219 |  | 264
Electric fuel and purchased power | 0 | 0 |  | 0
Cost of natural gas sold and transported | 951 | 1,456 |  | 1,910
Operating and maintenance expenses | 409 | 386 |  | 370
Other income (expense), net | 123 | 118 | [1] | 108
Operating Segments [Member] | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other | 64 | 115 |  | 107
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Regulated Operating Revenue | (24) | (5) |  | (4)
Intersegment Eliminations | Regulated Electric |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Electric | 2 | 2 |  | 2
Intersegment Eliminations | Regulated Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Natural Gas | $ 22 | $ 3 |  | $ 2
[1] | Other segment expenses, net, for 2023 additionally includes loss on Comanche Unit 3 litigation and workforce reduction expenses.

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