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COMMITMENTS AND CONTINGENCIES Long-term Purchase Commitments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) aircraft
Long-term Purchase Commitment [Line Items] |  |
Additional Options | 6 |
Additional - Pre Owned 700 A/C (in units) | 2 |
Conversion - 737 NG 700 to 737 NG 800 firm orders | 25 |
Additional 737 NG 800 Options | 33 |
Options - 737NG (in units) | 18 |
Additional - 700 A/C (in units) | 35 | [1]
Options - 737MAX (in units) | 191 |
Total | 533 |
Firm - 737NG 800 (in units) | 89 |
Firm - 737MAX (in units) | 30 |
Firm - 738MAX (in units) | 170 | [2]
2016 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 17 |
Options - 737MAX (in units) | 0 |
Total | 53 |
Firm - 737NG 800 (in units) | 36 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
2017 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 14 |
Options - 737MAX (in units) | 0 |
Total | 63 |
Firm - 737NG 800 (in units) | 35 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 14 |
2018 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 18 |
Additional - 700 A/C (in units) | 4 |
Options - 737MAX (in units) | 0 |
Total | 53 |
Firm - 737NG 800 (in units) | 18 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 13 |
2019 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 0 |
Total | 25 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 15 |
Firm - 738MAX (in units) | 10 |
2020 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 0 |
Total | 36 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 14 |
Firm - 738MAX (in units) | 22 |
2021 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 18 |
Total | 52 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 1 |
Firm - 738MAX (in units) | 33 |
2022 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 19 |
Total | 49 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 30 |
2023 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 23 |
Total | 47 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 24 |
2024 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 23 |
Total | 47 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 24 |
2025 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 36 |
Total | 36 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
2026 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 36 |
Total | 36 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
2027 |  |
Long-term Purchase Commitment [Line Items] |  |
Options - 737NG (in units) | 0 |
Additional - 700 A/C (in units) | 0 |
Options - 737MAX (in units) | 36 |
Total | 36 |
Firm - 737NG 800 (in units) | 0 |
Firm - 737MAX (in units) | 0 |
Firm - 738MAX (in units) | 0 |
Aircraft [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Committed expenditures, 2016 | $ | $ 1,100 |
Committed expenditures, 2017 | $ | 1,300 |
Committed expenditures, 2018 | $ | 1,100 |
Committed expenditures, 2019 | $ | 1,200 |
Committed expenditures, 2020 | $ | 1,500 |
Committed expenditures, 2021 and beyond | $ | $ 4,400 |
B-737-800 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of Aircrafts Purchased | 19 |
B-737-700 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of Aircrafts Purchased | 8 |
Number of aircrafts leased | 16 |
B737-300 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of aircrafts retired from service | 2 |
B737-500 |  |
Long-term Purchase Commitment [Line Items] |  |
Number of aircrafts retired from service | 2 |
[1] | To be acquired in leases from various third parties.
[2] | The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

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