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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts and Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Credit losses | $ 636 | $ 143 | $ 154
Regulatory assets | 17,189 | 16,443 |
Regulatory Balancing Accounts Receivable |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Total regulatory balancing accounts | 5,660 | 3,264 |
COVID-19 pandemic protection memorandum account, undercollection bad debt |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Regulatory assets | 5 | 4 |
FERC TO rates |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Regulatory assets | 78 |  |
Regulatory assets |  | 8 |
COVID-19 Pandemic protection memorandum account |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Regulatory assets | 17 | 26 |
Regulatory assets |  | 3 |
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Total regulatory balancing accounts | $ 507 | $ 126 |

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