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COMMITMENTS AND CONTINGENCIES Long-term Purchase Commitments (Details) $ in Millions | Dec. 31, 2016 USD ($) aircraft
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Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 60 |
Options - 737NG (in units) | 9 | [1]
Firm - 737MAX (in units) | 30 |
Firm - 738MAX (in units) | 170 | [2]
Options - 737MAX (in units) | 191 |
Additional - 700 A/C (in units) | 18 | [3]
Total | 478 |
Options Exercised 737NG | 2 |
2017 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 39 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 14 |
Options - 737MAX (in units) | 0 |
Additional - 700 A/C (in units) | 14 |
Total | 67 |
2018 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 21 |
Options - 737NG (in units) | 9 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 13 |
Options - 737MAX (in units) | 0 |
Additional - 700 A/C (in units) | 4 |
Total | 47 |
2019 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 15 |
Firm - 738MAX (in units) | 0 |
Options - 737MAX (in units) | 5 |
Additional - 700 A/C (in units) | 0 |
Total | 20 |
2020 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 14 |
Firm - 738MAX (in units) | 0 |
Options - 737MAX (in units) | 8 |
Additional - 700 A/C (in units) | 0 |
Total | 22 |
2021 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 1 |
Firm - 738MAX (in units) | 13 |
Options - 737MAX (in units) | 18 |
Additional - 700 A/C (in units) | 0 |
Total | 32 |
2022 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 15 |
Options - 737MAX (in units) | 19 |
Additional - 700 A/C (in units) | 0 |
Total | 34 |
2023 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 34 |
Options - 737MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 57 |
2024 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 41 |
Options - 737MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 64 |
2025 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 40 |
Options - 737MAX (in units) | 36 |
Additional - 700 A/C (in units) | 0 |
Total | 76 |
2026 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
Options - 737MAX (in units) | 36 |
Additional - 700 A/C (in units) | 0 |
Total | 36 |
2027 |  |
Long-term Purchase Commitment [Line Items] |  |
Firm - 737NG 800 (in units) | 0 |
Options - 737NG (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
Options - 737MAX (in units) | 23 |
Additional - 700 A/C (in units) | 0 |
Total | 23 |
Aircraft [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Committed expenditures, 2017 | $ | $ 1,100 |
Committed expenditures, 2018 | $ | 893 |
Committed expenditures, 2019 | $ | 614 |
Committed expenditures, 2020 | $ | 821 |
Committed expenditures, 2021 | $ | 952 |
Committed expenditures, 2022 and beyond | $ | $ 5,100 |
[1] | Includes two -800 options exercised in January 2017.
[2] | The Company has flexibility to substitute 737-7 in lieu of 737-8 firm orders beginning in 2019.
[3] | To be acquired in leases from various third parties.

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