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Leases - Maturities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Maturities of operating lease liabilities |  |  |
2020 | $ 130 |  | $ 141
2021 | 113 |  | 99
2022 | 84 |  | 91
2023 | 58 |  | 67
2024 | 48 |  | 52
Thereafter | 164 |  | $ 210
Total undiscounted lease payments | 597 |  |
Less imputed interest | (114) |  |
Total operating lease liability | 483 | $ 498 |
Maturities of finance lease liabilities |  |  |
2020 | 7 |  |
2021 | 7 |  |
2022 | 7 |  |
2023 | 7 |  |
2024 | 7 |  |
Thereafter | 26 |  |
Total undiscounted lease payments | 61 |  |
Less imputed interest | (16) |  |
Total finance lease liability | $ 45 |  |
Weighted average discount rate for operating leases | 6.58% |  |
Weighted average discount rate for financing leases | 6.31% |  |

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