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CAPITALIZATION - Long-term Debt and Other Long-term Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Capitalization [Line Items] |  |
Finance lease obligations | $ 14 | $ 23
Unamortized debt discounts | (9) | (5)
Unamortized debt issuance costs | (127) | (110)
Unamortized fair value adjustments | 3 | 5
Currently payable long-term debt | (1,250) | (351)
Total long-term debt and other long-term obligations | 22,885 | 21,203
FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
FMBs and secured notes - fixed rate | $ 5,709 | 5,153
FMBs and secured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 2.65% |
FMBs and secured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 8.25% |
Unsecured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
Unsecured notes - fixed rate | $ 18,545 | $ 16,488
Unsecured notes - fixed rate | Minimum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 1.60% |
Unsecured notes - fixed rate | Maximum |  |
Schedule of Capitalization [Line Items] |  |
Interest rate (percent) | 7.375% |

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