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REGULATORY ASSETS, LIABILITIES, AND BALANCING ACCOUNTS (Long-Term Regulatory Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2022
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Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | $ 19,667 | $ 19,444 |
Cost of removal obligations |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 8,355 | 8,191 |
Public purpose programs |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 1,300 | 1,238 |
Employee benefit plans |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 1,037 | 1,032 |
Transmission tower wireless licenses |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 342 | 384 |
SFGO sale |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 138 | 185 |
SB 901 Securitization |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 6,550 | 6,628 | $ 5,540
Wildfire self-insurance |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | 498 | 407 |
Other |  |  |
Regulatory Liabilities [Line Items] |  |  |
Total noncurrent regulatory liabilities | $ 1,447 | $ 1,379 |

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