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Leases - Lease Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Leases, under ASC 842 |  |
2020 | $ 153 |
2021 | 139 |
2022 | 123 |
2023 | 104 |
2024 | 86 |
Thereafter | 212 |
Total lease payments | 817 |
Less: Interest | (74) |
Present value of lease liabilities | 743 |
Finance Leases, under ASC 842 |  |
2020 | 83 |
2021 | 73 |
2022 | 64 |
2023 | 10 |
2024 | 3 |
Thereafter | 5 |
Total lease payments | 238 |
Less: Interest | (16) |
Present value of lease liabilities | 222 |
Operating lease payments related to options to extend lease terms that are reasonably certain of being exercised | 47 |
Minimum operating lease payments for leases signed but not yet commenced | 4 |
Minimum finance lease payments for leases signed but not yet commenced | $ 302 |
Operating Leases, under ASC 840 |  |
2019 |  | $ 94
2020 |  | 75
2021 |  | 62
2022 |  | 51
2023 |  | 40
Thereafter |  | 108
Total |  | $ 430
Real Estate |  |
Lessee, Lease, Description [Line Items] |  |
Operating leases not yet commenced, term | 5 years |
Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Finance leases not yet commenced, term | 5 years |

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