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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Sale of Transmission Tower Wireless Licenses) (Details) $ in Millions | Aug. 15, 2021 USD ($) | Feb. 16, 2021 USD ($) transmissionTower
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Proceeds from contract liability | $ 106 |
Pacific Gas & Electric Co (Utility) | SBA Communications Corporation | Wireless Licenses |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Duration of contract |  | 100 years
Other tower, duration of contract |  | 15 years
Proceeds from sale of transmission tower license |  | $ 946
Proceeds from sale of transmission tower license, final purchase price | 947 |
Proceeds from financing obligation | $ 370 |
Proceeds from regulatory liabilities, current |  | 471
Proceeds from regulatory liabilities, noncurrent |  | $ 455
Pacific Gas & Electric Co (Utility) | SBA Communications Corporation | Minimum | Effective Date Towers | Wireless Licenses |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Number of electric transmission towers | transmissionTower |  | 700
Number of other electric transmission towers | transmissionTower |  | 28,000

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