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LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Long-term Debt |  |  |
Long-term debt, gross | $ 17,936 |  | $ 17,958
Unamortized premium, net | 1,187 |  | 1,261
Debt issuance costs | (64) |  | (73)
Net book value of debt | 19,059 |  | 19,146
Long-term finance leases | 593 |  | 546
Current finance leases | 169 |  | 143
Total debt and finance leases | 19,821 |  | 19,835
Less: current maturities of financing leases | (169) |  | (143)
Less: current maturities of long-term debt | (1,055) |  | (22)
Long-term debt, net | $ 18,597 |  | 19,670
8.750% medium-term notes due 2023 | Medium-term Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 8.75% | 8.75% |
Long-term debt, gross | $ 0 |  | 22
2.900% senior notes due 2024 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 2.90% |  |
Long-term debt, gross | $ 654 |  | 654
6.950% senior notes due 2024 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.95% |  |
Long-term debt, gross | $ 291 |  | 291
3.450% senior notes due 2024 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.45% |  |
Long-term debt, gross | $ 111 |  | 111
5.875% senior notes due 2025 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 5.875% |  |
Long-term debt, gross | $ 606 |  | 606
3.500% senior notes due 2025 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.50% |  |
Long-term debt, gross | $ 137 |  | 137
5.500% senior notes due 2025 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 5.50% |  |
Long-term debt, gross | $ 465 |  | 465
5.550% senior notes due 2026 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 5.55% |  |
Long-term debt, gross | $ 870 |  | 870
3.200% senior notes due 2026 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.20% |  |
Long-term debt, gross | $ 182 |  | 182
3.400% senior notes due 2026 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.40% |  |
Long-term debt, gross | $ 284 |  | 284
7.500% debentures due 2026 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.50% |  |
Long-term debt, gross | $ 112 |  | 112
8.500% senior notes due 2027 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 8.50% |  |
Long-term debt, gross | $ 489 |  | 489
3.000% senior notes due 2027 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.00% |  |
Long-term debt, gross | $ 216 |  | 216
7.125% debentures due 2027 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.125% |  |
Long-term debt, gross | $ 150 |  | 150
7.000% debentures due 2027 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.00% |  |
Long-term debt, gross | $ 48 |  | 48
6.625% debentures due 2028 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.625% |  |
Long-term debt, gross | $ 14 |  | 14
7.150% debentures due 2028 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.15% |  |
Long-term debt, gross | $ 232 |  | 232
7.200% senior debentures due 2028 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.20% |  |
Long-term debt, gross | $ 82 |  | 82
6.375% senior notes due 2028 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.375% |  |
Long-term debt, gross | $ 578 |  | 578
7.200% debentures due 2029 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.20% |  |
Long-term debt, gross | $ 135 |  | 135
7.950% debentures due 2029 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.95% |  |
Long-term debt, gross | $ 116 |  | 116
8.450% senior notes due 2029 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 8.45% |  |
Long-term debt, gross | $ 116 |  | 116
3.500% senior notes due 2029 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 3.50% |  |
Long-term debt, gross | $ 286 |  | $ 286
Variable rate bonds due 2030 (5.610% and 5.320% as of September 30, 2023 and December 31, 2022, respectively) | Variable Rate Bonds |  |  |
Long-term Debt |  |  |
Debt instrument, variable rate | 5.61% |  | 5.32%
Long-term debt, gross | $ 68 |  | $ 68
8.875% senior notes due 2030 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 8.875% |  |
Long-term debt, gross | $ 1,000 |  | 1,000
6.625% senior notes due 2030 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.625% |  |
Long-term debt, gross | $ 1,449 |  | 1,449
6.125% senior notes due 2031 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.125% |  |
Long-term debt, gross | $ 1,143 |  | 1,143
7.500% senior notes due 2031 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.50% |  |
Long-term debt, gross | $ 900 |  | 900
7.875% senior notes due 2031 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.875% |  |
Long-term debt, gross | $ 500 |  | 500
6.450% senior notes due 2036 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.45% |  |
Long-term debt, gross | $ 1,727 |  | 1,727
Zero Coupon senior notes due 2036 | Senior Notes |  |  |
Long-term Debt |  |  |
Long-term debt, gross | $ 673 |  | 673
4.300% senior notes due 2039 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.30% |  |
Long-term debt, gross | $ 247 |  | 247
7.950% senior notes due 2039 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.95% |  |
Long-term debt, gross | $ 325 |  | 325
6.200% senior notes due 2040 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.20% |  |
Long-term debt, gross | $ 737 |  | 737
4.500% senior notes due 2044 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.50% |  |
Long-term debt, gross | $ 191 |  | 191
4.625% senior notes due 2045 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.625% |  |
Long-term debt, gross | $ 296 |  | 296
6.600% senior notes due 2046 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 6.60% |  |
Long-term debt, gross | $ 1,117 |  | 1,117
4.400% senior notes due 2046 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.40% |  |
Long-term debt, gross | $ 424 |  | 424
4.100% senior notes due 2047 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.10% |  |
Long-term debt, gross | $ 258 |  | 258
4.200% senior notes due 2048 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.20% |  |
Long-term debt, gross | $ 304 |  | 304
4.400% senior notes due 2049 | Senior Notes |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 4.40% |  |
Long-term debt, gross | $ 280 |  | 280
7.730% debentures due 2096 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.73% |  |
Long-term debt, gross | $ 58 |  | 58
7.500% debentures due 2096 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.50% |  |
Long-term debt, gross | $ 60 |  | 60
7.250% debentures due 2096 | Debentures |  |  |
Long-term Debt |  |  |
Debt instrument interest rate stated percentage | 7.25% |  |
Long-term debt, gross | $ 5 |  | $ 5

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