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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions | 9 Months Ended |
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Sep. 30, 2021 | Dec. 31, 2020
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | $ 11,661 | $ 10,424
Proceeds received from sale of transmission tower wireless licenses, refunded to customers | 455 |
Federal Energy Regulatory Commission (FERC) |  |
Regulatory Liabilities [Line Items] |  |
Proceeds received from sale of transmission tower wireless licenses, refunded to customers | 314 |
California Public Utilities Commission (CPUC) |  |
Regulatory Liabilities [Line Items] |  |
Proceeds received from sale of transmission tower wireless licenses, refunded to customers | 141 |
Cost of removal obligations |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 7,216 | 6,905
Recoveries in excess of AROs |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 306 | 458
Public purpose programs |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 974 | 948
Employee benefit plans |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 1,022 | 995
Tower Licenses |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 455 | 0
SFGO Sale |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | 359 | 0
Other |  |
Regulatory Liabilities [Line Items] |  |
Total long-term regulatory liabilities | $ 1,329 | $ 1,118

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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