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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenues Disaggregated by Type of Customer) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | $ 5,118 | $ 5,215 | $ 10,916 | $ 9,931
Electric |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 3,690 | 3,951 | 7,848 | 7,346
Natural gas |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 1,428 | 1,264 | 3,068 | 2,585
Pacific Gas & Electric Co (Utility) |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 5,118 | 5,215 | 10,916 | 9,931
Pacific Gas & Electric Co (Utility) | Electric |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 3,213 | 3,574 | 6,451 | 6,483
Regulatory balancing accounts | 477 | 377 | 1,397 | 863
Total operating revenues | 3,690 | 3,951 | 7,848 | 7,346
Pacific Gas & Electric Co (Utility) | Electric | Residential |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 1,213 | 1,352 | 2,707 | 2,815
Pacific Gas & Electric Co (Utility) | Electric | Commercial |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 1,252 | 1,183 | 2,425 | 2,196
Pacific Gas & Electric Co (Utility) | Electric | Industrial |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 322 | 305 | 672 | 632
Pacific Gas & Electric Co (Utility) | Electric | Agricultural |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 484 | 431 | 700 | 583
Pacific Gas & Electric Co (Utility) | Electric | Public street and highway lighting |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 19 | 18 | 37 | 35
Pacific Gas & Electric Co (Utility) | Electric | Other |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | (77) | 285 | (90) | 222
Pacific Gas & Electric Co (Utility) | Natural gas |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 853 | 766 | 2,880 | 2,498
Regulatory balancing accounts | 575 | 498 | 188 | 87
Total operating revenues | 1,428 | 1,264 | 3,068 | 2,585
Pacific Gas & Electric Co (Utility) | Natural gas | Residential |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 388 | 418 | 1,851 | 1,626
Pacific Gas & Electric Co (Utility) | Natural gas | Commercial |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 197 | 139 | 541 | 384
Pacific Gas & Electric Co (Utility) | Natural gas | Transportation service only |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | 356 | 346 | 755 | 672
Pacific Gas & Electric Co (Utility) | Natural gas | Other |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total operating revenues | $ (88) | $ (137) | $ (267) | $ (184)

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