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Leases (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) aircraft CapitalLeases | Sep. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) aircraft CapitalLeases | Dec. 31, 2015 USD ($) aircraft CapitalLeases | Dec. 31, 2014 USD ($) | Jul. 09, 2012 aircraft
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract] |  |  |  |  |  |  |
Flight equipment |  | $ 923,000,000 |  | $ 923,000,000 | $ 435,000,000 |  |
Less: accumulated amortization |  | 82,000,000 |  | 82,000,000 | 29,000,000 |  |
Total |  | 841,000,000 |  | 841,000,000 | $ 406,000,000 |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
2017 |  | 80,000,000 |  | 80,000,000 |  |  |
2018 |  | 80,000,000 |  | 80,000,000 |  |  |
2019 |  | 78,000,000 |  | 78,000,000 |  |  |
2020 |  | 78,000,000 |  | 78,000,000 |  |  |
2021 |  | 74,000,000 |  | 74,000,000 |  |  |
Thereafter |  | 353,000,000 |  | 353,000,000 |  |  |
Total minimum lease payments |  | 743,000,000 |  | 743,000,000 |  |  |
Less amount representing interest |  | 128,000,000 |  | 128,000,000 |  |  |
Present value of minimum lease payments (a) | [1] | 615,000,000 |  | 615,000,000 |  |  |
Less current portion |  | 58,000,000 |  | 58,000,000 |  |  |
Long-term portion |  | $ 557,000,000 |  | $ 557,000,000 |  |  |
Number of capital leased assets | CapitalLeases |  | 51 |  | 51 | 28 |  |
Rental expense for operating leases |  |  |  | $ 932,000,000 | $ 909,000,000 | $ 931,000,000 |
Number of operating leased assets | aircraft |  | 83 |  | 83 |  |  |
Subleases |  |  |  |  |  |  |
2017 |  | $ (103,000,000) |  | $ (103,000,000) |  |  |
2018 |  | (102,000,000) |  | (102,000,000) |  |  |
2019 |  | (97,000,000) |  | (97,000,000) |  |  |
2020 |  | (78,000,000) |  | (78,000,000) |  |  |
2021 |  | (41,000,000) |  | (41,000,000) |  |  |
Thereafter |  | (26,000,000) |  | (26,000,000) |  |  |
Total minimum lease payments |  | (447,000,000) |  | (447,000,000) |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Lease Incentive Obligation Excluded |  | 66,000,000 |  | 66,000,000 |  |  |
Construction Obligation not yet placed in service |  | 414,000,000 |  | 414,000,000 |  |  |
Operating leases |  |  |  |  |  |  |
2017 |  | 592,000,000 |  | 592,000,000 |  |  |
2018 |  | 485,000,000 |  | 485,000,000 |  |  |
2019 |  | 419,000,000 |  | 419,000,000 |  |  |
2020 |  | 325,000,000 |  | 325,000,000 |  |  |
2021 |  | 217,000,000 |  | 217,000,000 |  |  |
Thereafter |  | 1,297,000,000 |  | 1,297,000,000 |  |  |
Total minimum lease payments |  | 3,335,000,000 |  | 3,335,000,000 |  |  |
2017 | [2] | 671,000,000 |  | 671,000,000 |  |  |
2018 | [2] | 562,000,000 |  | 562,000,000 |  |  |
2019 | [2] | 491,000,000 |  | 491,000,000 |  |  |
2020 | [2] | 377,000,000 |  | 377,000,000 |  |  |
2021 | [2] | 232,000,000 |  | 232,000,000 |  |  |
Thereafter | [2] | 715,000,000 |  | 715,000,000 |  |  |
Total minimum lease payments | [2] | 3,048,000,000 |  | $ 3,048,000,000 |  |  |
Minimum |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Renewal term |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Renewal term |  |  |  | 5 years |  |  |
Love Field Airport |  |  |  |  |  |  |
Operating leases |  |  |  |  |  |  |
2017 | [1] | 24,000,000 |  | $ 24,000,000 |  |  |
2018 | [1] | 25,000,000 |  | 25,000,000 |  |  |
2019 | [1] | 25,000,000 |  | 25,000,000 |  |  |
2020 | [1] | 26,000,000 |  | 26,000,000 |  |  |
2021 | [1] | 26,000,000 |  | 26,000,000 |  |  |
Thereafter | [1] | 608,000,000 |  | 608,000,000 |  |  |
Total minimum lease payments | [1] | $ 734,000,000 |  | $ 734,000,000 |  |  |
B-717-200 |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Number of capital leased assets | aircraft |  | 2 |  | 2 | 1 |  |
Number of operating leased assets | aircraft |  | 76 |  | 76 |  |  |
Number of aircrafts subleased | aircraft |  |  |  |  |  |  | 88
Number of owned assets | aircraft |  | 10 |  | 10 |  |  |
Lease terms for owned aircraft |  | 6 years |  |  |  |  |
Contingent rental payment due |  | $ 0 |  | $ 0 |  |  |
Residual value of leased properties |  | $ 0 |  | $ 0 |  |  |
Estimated Loss On Sublease |  |  | $ 137,000,000 |  |  |  |
Additional Estimated Loss on Sublease |  |  |  |  | $ 22,000,000 |  |
Grounding Loss on Sublease |  |  |  |  | $ 9,000,000 |  |
B-717-200 | Minimum |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Sublease terms |  | 2 years |  |  |  |  |
B-717-200 | Maximum |  |  |  |  |  |  |
Capital Leased Assets [Line Items] |  |  |  |  |  |  |
Sublease terms |  | 7 years |  |  |  |  |
[1] | Excludes lease incentive obligation of $66 million.
[2] | Includes a portion of the Company's Construction obligation that has not yet been placed into service as of December 31, 2016.

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- Definition The remaining estimated cost, at the scheduled date of delivery of each B717 to Delta (including the conversion, maintenance, and other contractual costs to be incurred), of the lease of the B717s currently accounted for as operating leases, net of the future sublease income from Delta. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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