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Long-term Purchase Commitments (Details) $ in Millions | Jun. 30, 2016 USD ($) aircraft
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Long-term Purchase Commitment [Line Items] |  |
Capital Leases, Future Minimum Payments Due, Next Twelve Months | $ | $ 15 |
Capital Leases, Future Minimum Payments Due in Two Years | $ | 29 |
Capital Leases, Future Minimum Payments Due in Three Years | $ | 29 |
Capital Leases, Future Minimum Payments Due in Four Years | $ | 28 |
Capital Leases, Future Minimum Payments Due in Five Years | $ | 27 |
Capital Leases, Future Minimum Payments Due Thereafter | $ | $ 176 |
Firm 737 NG 800 (in units) | 89 |
Options - 737 NG (in units) | 18 |
Firm - 737 MAX (in units) | 30 |
Firm - 738 MAX (in units) | 170 | [1]
Options - 738 MAX (in units) | 191 | [1]
Additional - 700 A/C (in units) | 41 |
Total | 539 |
2016 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 38 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 0 |
Options - 738 MAX (in units) | 0 |
Additional - 700 A/C (in units) | 23 |
Total | 61 | [2]
2017 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 39 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 14 |
Options - 738 MAX (in units) | 0 |
Additional - 700 A/C (in units) | 14 |
Total | 67 |
2018 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 12 |
Options - 737 NG (in units) | 18 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 13 |
Options - 738 MAX (in units) | 0 |
Additional - 700 A/C (in units) | 4 |
Total | 47 |
2019 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 15 |
Firm - 738 MAX (in units) | 0 |
Options - 738 MAX (in units) | 5 |
Additional - 700 A/C (in units) | 0 |
Total | 20 |
2020 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 14 |
Firm - 738 MAX (in units) | 0 |
Options - 738 MAX (in units) | 8 |
Additional - 700 A/C (in units) | 0 |
Total | 22 |
2021 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 1 |
Firm - 738 MAX (in units) | 13 |
Options - 738 MAX (in units) | 18 |
Additional - 700 A/C (in units) | 0 |
Total | 32 |
2022 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 15 |
Options - 738 MAX (in units) | 19 |
Additional - 700 A/C (in units) | 0 |
Total | 34 |
2023 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 34 |
Options - 738 MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 57 |
2024 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 41 |
Options - 738 MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 64 |
2025 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 40 |
Options - 738 MAX (in units) | 36 |
Additional - 700 A/C (in units) | 0 |
Total | 76 |
2026 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 0 |
Options - 738 MAX (in units) | 36 |
Additional - 700 A/C (in units) | 0 |
Total | 36 |
2027 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm 737 NG 800 (in units) | 0 |
Options - 737 NG (in units) | 0 |
Firm - 737 MAX (in units) | 0 |
Firm - 738 MAX (in units) | 0 |
Options - 738 MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 23 |
Aircraft [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Committed expenditures, 2016 | $ | $ 592 |
Committed expenditures, 2017 | $ | 1,100 |
Committed expenditures, 2018 | $ | 681 |
Committed expenditures, 2019 | $ | 614 |
Committed expenditures, 2020 | $ | 821 |
Committed expenditures, 2021 and beyond | $ | $ 6,100 |
[1] | The Company has flexibility to substitute 737-7 in lieu of 737-8 aircraft beginning in 2019.
[2] | Includes 14 737-800s and 19 737-700s delivered as of June 30, 2016. The 19 737-700s are classified as capital leases and have increased the Company's future capital lease obligations by $15 million remaining in 2016, $29 million in 2017, $29 million in 2018, $28 million in 2019, $27 million in 2020, and $176 million thereafter.

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