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Debt - Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Disclosure [Abstract] |  |
2021 | $ 400 |
2022 | 1,213 |
2023 | 777 |
2024 | 1,600 |
2025 | 1,350 |
Thereafter | 2,651 |
Total debt payments (excluding financing lease payments) | 7,991 |
Less: unamortized discounts, premiums and deferred financing fees | (13) |
Finance Lease, Liability | 81 |
Debt and Lease Obligation, Total | $ 8,059 | $ 8,192

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