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Leases (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) aircraft | Dec. 31, 2018 USD ($) aircraft Years
Property Subject to or Available for Operating Lease, Number of Units | Years |  |  | 51
Sublease Income |  | $ 97,000,000 |
Sublease income - 2020 |  | 78,000,000 | $ 357,000,000
Sublease income - 2021 |  | 41,000,000 | 244,000,000
Sublease income - 2022 |  | 17,000,000 | 172,000,000
Sublease income - 2023 |  | 7,000,000 | 146,000,000
Sublease income - 2024 |  | 1,000,000 |
Unrecorded Unconditional Purchase Obligation |  | $ 543,000,000 |
Lessee, Operating Lease, Lease Not yet Commenced, Description | aircraft |  | 16 |
Capital Leased Assets, Gross |  |  | 1,300,000,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  |  | $ 304,000,000
September 2017 Remaining -300 Aircraft grounding charge | $ 63,000,000 |  |
B-717-200 |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 65 | 73
Finance Leases, Net Investment in Sales Type Leases, Contingent Payments on Leased Property |  | $ 0 |
Finance Leases, Net Investment in Sales Type Leases, Unguaranteed Residual Values of Leased Property |  | $ 0 |
Finance Leased Assets, Number of Units | aircraft |  | 2 |
Property Subject To Or Available For Lease, Number Of Units, Total | aircraft |  | 88 |
Property Subject To Or Available For Lease Remaining, Number Of Units, Total | aircraft |  | 85 |
Minimum | B-717-200 |  |  |
Sublease Terms |  | 1 month |
Minimum | 737 MAX 8 |  |  |
Lessee, Renewal Term |  | 8 years |
Minimum | Aircraft |  |  |
Lessee, Renewal Term |  | 1 year |
Lessee Operating and Finance Lease Term of Contract |  | 1 month |
Minimum | Airport-Related |  |  |
Lessee, Renewal Term |  | 1 year |
Lessee Operating Lease Terms of Contract |  | 1 month |
Minimum | Other Property |  |  |
Lessee, Renewal Term |  | 6 months |
Lessee Operating and Finance Lease Term of Contract |  | 2 months |
Maximum | B-717-200 |  |  |
Sublease Terms |  | 5 years |
Maximum | 737 MAX 8 |  |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract |  | 9 years |
Maximum | Aircraft |  |  |
Lessee, Renewal Term |  | 6 years |
Lessee Operating and Finance Lease Term of Contract |  | 12 years |
Maximum | Airport-Related |  |  |
Lessee, Renewal Term |  | 10 years |
Lessee Operating Lease Terms of Contract |  | 27 years |
Maximum | Other Property |  |  |
Lessee, Renewal Term |  | 5 years |
Lessee Operating and Finance Lease Term of Contract |  | 7 years |
Property Available for Operating Lease [Member] |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  |  | 124
Assets Sold to Third Party | B-717-200 |  |  |
Owned Assets, Number of Units | aircraft |  | 10 |
Lease Expired | B-717-200 |  |  |
Property Subject to or Available for Operating Lease, Number of Units | aircraft |  | 8 |
Property Subject To Or Available For Lease, Number Of Units, Total | aircraft |  |  | 3

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