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Debt and Credit Agreements (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Debt at December 2020 and December 2019 is shown in the table below. For information regarding the fair value of debt, see Note 13, Fair Value Measurements.
| Maturity at December | Average Interest Rates at December | December | December
(Dollars in Millions) | 2020 | 2020 | 2020 | 2019
Notes | 2021-2068 | 4.0% | $ | 16,542 |  | $ | 16,056 |
Equipment Obligations(a) | 2021-2023 | 6.3% | 160 |  | 178 |
Finance Leases | 2020-2026 | 14.5% | 3 |  | 4 |
Subtotal Long-term Debt (including current portion) |  |  | $ | 16,705 |  | $ | 16,238 |
Less Debt Due within One Year |  |  | (401) |  | (245) |
Long-term Debt (excluding current portion) |  |  | $ | 16,304 |  | $ | 15,993 |
(a) Equipment obligations are secured by an interest in certain railroad equipment.
Schedule of Long-term Debt Maturities | Long-term Debt Maturities (Net of Discounts, Premiums and Issuance Costs)
(Dollars in Millions) | Maturities at
Fiscal Years Ending | December 2020
2021 | $ | 401 |
2022 | 162 |
2023 | 139 |
2024 | 551 |
2025 | 601 |
Thereafter | 14,851 |
Total Long-term Debt Maturities, including current portion | $ | 16,705 |

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