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Debt and Finance Lease Obligations, Other Debt and Other Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Principal Payments Due on Debt |  |  |  |
2021 | [1] |  | $ 603 |
2022 |  |  | 6 |
2023 |  |  | 1,445 |
2024 |  |  | 925 |
2025 |  |  | 1,650 |
Thereafter |  |  | 8,474 |
Net unamortized debt issuance costs and other |  |  | (90) | $ (88)
Total debt |  |  | 13,013 | $ 8,881
Credit Facilities [Member] | IEnova Revolver [Member] | Central Mexico Terminals [Member] |  |  |  |
Principal Payments Due on Debt |  |  |  |
2021 |  |  | $ 598 |
Pure Biofuels del Peru S.A.C (Now Known as Valero Peru S.A.C.) [Member] |  |  |  |
Other Debt (Textual) |  |  |  |
Amount of debt retired |  | $ 137 |  |
[1] | As of December 31, 2020, our debt obligations due in 2021 include $598 million associated with borrowings under the IEnova Revolver.

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