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Leases and Capacity Purchase Agreements - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | [1]
--- | --- | --- | ---
Operating Leases |  |
2020 | $ 920 |
2021 | 754 |
2022 | 591 |
2023 | 633 |
2024 | 626 |
After 2024 | 4,214 |
Minimum lease payments | 7,738 |
Imputed interest | (2,106) |
Present value of minimum lease payments | 5,632 |
Less: current maturities of lease obligations | (686) | $ (719)
Long-term lease obligations | 4,946 | 5,276
Finance Leases |  |
2020 | 62 |
2021 | 75 |
2022 | 49 |
2023 | 38 |
2024 | 35 |
After 2024 | 57 |
Minimum lease payments | 316 |
Imputed interest | (50) |
Present value of minimum lease payments | 266 |
Less: current maturities of lease obligations | (46) | (123)
Long-term lease obligations | $ 220 | $ 224
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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