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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Doubtful Accounts and Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Credit losses | $ 100 | $ 70 |
Regulatory assets | 15,551 |  | $ 15,561
Regulatory Balancing Accounts Receivable |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Total regulatory balancing accounts | 5,852 |  | 7,227
FERC TO rates |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Regulatory assets | 91 |  | 85
Residential uncollectibles balancing accounts | Regulatory Balancing Accounts Receivable |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Total regulatory balancing accounts | 72 |  | $ 260
Decrease in regulatory balancing accounts | $ 260 |  |

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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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