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Debt - Schedule of Maturities of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt Disclosure [Abstract] |  |
2021 | $ 2,558 |
2022 | 2,575 |
2023 | 3,250 |
2024 | 1,925 |
2025 | 1,566 |
Thereafter | 21,522 |
Total debt – KMI and Subsidiaries | $ 33,396 | $ 33,360

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