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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounting Policies [Abstract] |  |  |  |
Period for probable revenue recovery |  |  | 24 months |
Pacific Gas & Electric Co (Utility) |  |  |  |
Revenue from contracts with customers |  |  |  |
Total operating revenues | $ 5,465 | $ 4,882 | $ 15,396 | $ 13,721
Pacific Gas & Electric Co (Utility) | Electric |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 4,630 | 4,296 | 11,113 | 10,018
Regulatory balancing accounts | (449) | (486) | 414 | 267
Total operating revenues | 4,181 | 3,810 | 11,527 | 10,285
Pacific Gas & Electric Co (Utility) | Electric | Residential |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 1,962 | 1,862 | 4,778 | 4,092
Pacific Gas & Electric Co (Utility) | Electric | Commercial |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 1,580 | 1,455 | 3,776 | 3,537
Pacific Gas & Electric Co (Utility) | Electric | Industrial |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 467 | 453 | 1,099 | 1,135
Pacific Gas & Electric Co (Utility) | Electric | Agricultural |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 655 | 657 | 1,238 | 1,149
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 18 | 17 | 53 | 51
Pacific Gas & Electric Co (Utility) | Electric | Other |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | (52) | (148) | 169 | 54
Pacific Gas & Electric Co (Utility) | Natural gas |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 736 | 679 | 3,234 | 2,978
Regulatory balancing accounts | 548 | 393 | 635 | 458
Total operating revenues | 1,284 | 1,072 | 3,869 | 3,436
Pacific Gas & Electric Co (Utility) | Natural gas | Residential |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 295 | 303 | 1,921 | 1,795
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 102 | 90 | 486 | 434
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | 323 | 259 | 995 | 902
Pacific Gas & Electric Co (Utility) | Natural gas | Other |  |  |  |
Revenue from contracts with customers |  |  |  |
Total revenue from contracts with customers | $ 16 | $ 27 | $ (168) | $ (153)

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