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Leases Capital Leases, Balance Sheet, Assets by Major Class, Net (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Capital Leased Assets [Line Items] |  |  |
2019 |  |  | $ 111
2020 |  |  | 109
2021 |  |  | 105
2022 |  |  | 100
2023 |  |  | 97
Thereafter |  |  | 335
Total minimum lease payments |  |  | 857
Less amount representing interest |  |  | 126
Present value of minimum lease payments (a) | [1] |  | 731
Less current portion |  |  | (85)
Long-term portion |  |  | 646
Lease Incentive Obligation Excluded |  |  | 114
Subleases |  |  |
2019 |  |  | (92)
2020 |  |  | (78)
2021 |  |  | (41)
2022 |  |  | (17)
2023 |  |  | (7)
Thereafter |  |  | (1)
Total minimum lease payments |  |  | (236)
Operating Leased Assets [Line Items] |  |  |
2019 |  | $ 48 | 348
2020 |  | 78 | 357
2021 |  | 41 | 244
2022 |  | 17 | 172
2023 |  | $ 7 | 146
Thereafter |  |  | 474
Total minimum lease payments |  |  | 1,741
2019 |  |  | 256
2020 |  |  | 279
2021 |  |  | 203
2022 |  |  | 155
2023 |  |  | 139
Thereafter |  |  | 473
Total minimum lease payments |  |  | $ 1,505
[1] | Excludes lease incentive obligation of $114 million.

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