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CAPITALIZATION - Long-term Debt and Other Long-term Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Capitalization [Line Items] |  |
Finance lease obligations | $ 23 | $ 36
Unamortized debt discounts | (5) | (8)
Unamortized debt issuance costs | (110) | (126)
Unamortized fair value adjustments | 5 | 6
Currently payable long-term debt | (351) | (1,606)
Total long-term debt and other long-term obligations | 21,203 | 22,248
FMBs and secured notes - fixed rate |  |
Schedule of Capitalization [Line Items] |  |
FMBs and secured notes - fixed rate | $ 5,153 | 5,021
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 | $ 16,488 | $ 18,925
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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