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CAPITALIZATION - Long-term Debt and Other Long-term Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Capitalization [Line Items] |  |
Finance lease obligations | $ 12 | $ 14
Unamortized debt discounts | (14) | (9)
Unamortized debt issuance costs | (122) | (127)
Unamortized fair value adjustments | 3 | 3
Currently payable long-term debt | (977) | (1,250)
Total long-term debt and other long-term obligations | 22,496 | 22,885
FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
FMBs and secured notes - fixed rate | 4,963 | 5,709
Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Unsecured notes - fixed rate | $ 18,631 | $ 18,545
Minimum | FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.65% |
Minimum | Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 1.60% |
Maximum | FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 8.25% |
Maximum | Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 6.875% |

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