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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total operating revenues | $ 6,250 | $ 5,941 | $ 18,131 | $ 17,788 |
Electric |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total operating revenues | 4,755 | 4,538 | 13,304 | 13,048 |
Natural gas |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total operating revenues | 1,495 | 1,403 | 4,827 | 4,740 |
Utility |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total operating revenues | 6,250 | 5,941 | 18,131 | 17,788 | $ 17,788
Utility | Electric |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 5,848 | 5,851 | 14,506 |  | 14,770
Regulatory balancing accounts | (1,093) | (1,313) | (1,202) |  | (1,722)
Total operating revenues | 4,755 | 4,538 | 13,304 | 13,048 | 13,048
Utility | Electric | Residential |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 2,306 | 2,572 | 5,561 |  | 5,887
Utility | Electric | Commercial |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 2,249 | 2,301 | 5,368 |  | 5,461
Utility | Electric | Industrial |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 655 | 707 | 1,455 |  | 1,561
Utility | Electric | Agricultural |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 807 | 802 | 1,484 |  | 1,421
Utility | Electric | Public street and highway lighting |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 27 | 26 | 80 |  | 78
Utility | Electric | Other, net |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | (196) | (557) | 558 |  | 362
Utility | Natural gas |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 1,098 | 1,027 | 4,593 |  | 4,014
Regulatory balancing accounts | 397 | 376 | 234 |  | 726
Total operating revenues | 1,495 | 1,403 | 4,827 | $ 4,740 | 4,740
Utility | Natural gas | Residential |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 490 | 412 | 2,629 |  | 2,142
Utility | Natural gas | Commercial |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 173 | 163 | 794 |  | 723
Utility | Natural gas | Transportation service only |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | 436 | 408 | 1,438 |  | 1,307
Utility | Natural gas | Other, net |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |
Total revenue from contracts with customers | $ (1) | $ 44 | $ (268) |  | $ (158)

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