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Significant Accounting Policies - Expected Impact of the Adoption of the New Lease Standard (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [2]
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts (2018—$8; 2017—$7) | $ 1,346 |  |  |  | $ 1,340 | [1] |  |  |  | $ 1,346 | $ 1,340 | [1] |  |
Prepaid expenses and other | 913 |  |  |  | 1,071 | [1] |  |  |  | 913 | 1,071 | [1] |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other property and equipment | 7,919 |  |  |  | 6,946 | [1] |  |  |  | 7,919 | 6,946 | [1] |  |
Less-Accumulated depreciation and amortization (owned) | (12,760) |  |  |  | (11,159) | [1] |  |  |  | (12,760) | (11,159) | [1] |  |
Flight equipment | 1,029 |  |  |  | 1,151 | [1] |  |  |  | 1,029 | 1,151 | [1] |  |
Less-Accumulated amortization | (654) |  |  |  | (777) | [1] |  |  |  | (654) | (777) | [1] |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of capital leases | 149 |  |  |  | 128 | [1] |  |  |  | 149 | 128 | [1] |  |
Other | 619 |  |  |  | 576 | [1] |  |  |  | 619 | 576 | [1] |  |
Long-term obligations under finance leases | 1,134 |  |  |  | 996 |  |  |  |  | 1,134 | 996 |  |  |
Other liabilities and deferred credits: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 814 |  |  |  | 204 | [1] |  |  |  | 814 | 204 | [1] |  |
Other | 1,832 |  |  |  | 1,832 | [1] |  |  |  | 1,832 | 1,832 | [1] |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 6,668 |  |  |  | 4,549 | [1] |  |  |  | 6,668 | 4,549 | [1] |  |
Operating expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  | 2,601 | 2,232 | [2] | $ 2,197 |
Landing fees and other rent |  |  |  |  |  |  |  |  |  | 2,359 | 2,240 | [2] | 2,165 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,240 | 2,149 | [2],[3] | 1,977 | [3]
Operating expenses |  |  |  |  |  |  |  |  |  | 38,011 | 34,113 | [2] | 32,214 |
Operating income | 652 | $ 1,203 | $ 1,161 | $ 276 | 776 |  | $ 1,138 | $ 1,437 | $ 320 | 3,292 | 3,671 | [2] | 4,344 |
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (729) | (671) | [2] | (674) |
Interest capitalized |  |  |  |  |  |  |  |  |  | 70 | 84 | [2] | 72 |
Total nonoperating expense, net |  |  |  |  |  |  |  |  |  | (634) | (631) | [2] | (571) |
Income before income taxes |  |  |  |  |  |  |  |  |  | 2,658 | 3,040 | [2] | 3,773 |
Income tax expense |  |  |  |  |  |  |  |  |  | 529 | 896 | [2] | 1,539 |
Net income | $ 462 | $ 836 | $ 684 | $ 147 | $ 579 |  | $ 645 | $ 821 | $ 99 | $ 2,129 | $ 2,144 | [2],[3],[4],[5] | $ 2,234 | [3],[4],[5]
Earnings per share, basic (in dollars per share) | $ 1.71 | $ 3.07 | $ 2.49 | $ 0.52 | $ 1.99 |  | $ 2.15 | $ 2.67 | $ 0.32 | $ 7.73 | $ 7.08 | [2] | $ 6.77 |
Earnings per share, diluted (in dollars per share) | $ 1.70 | $ 3.06 | $ 2.48 | $ 0.52 | $ 1.98 |  | $ 2.15 | $ 2.67 | $ 0.32 | $ 7.70 | $ 7.06 | [2] | $ 6.76 |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts (2018—$8; 2017—$7) | $ 1,426 |  |  |  | $ 1,466 |  |  |  |  | $ 1,426 | $ 1,466 |  |  |
Prepaid expenses and other | 733 |  |  |  | 863 |  |  |  |  | 733 | 863 |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other property and equipment | 6,878 |  |  |  | 6,024 |  |  |  |  | 6,878 | 6,024 |  |  |
Less-Accumulated depreciation and amortization (owned) | (12,620) |  |  |  | (11,067) |  |  |  |  | (12,620) | (11,067) |  |  |
Flight equipment (Finance leases) | 992 |  |  |  | 940 |  |  |  |  | 992 | 940 |  |  |
Less-Accumulated amortization | (646) |  |  |  | (608) |  |  |  |  | (646) | (608) |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of finance leases | 123 |  |  |  | 78 |  |  |  |  | 123 | 78 |  |  |
Current maturities of operating leases | 719 |  |  |  | 949 |  |  |  |  | 719 | 949 |  |  |
Other | 553 |  |  |  | 518 |  |  |  |  | 553 | 518 |  |  |
Long-term obligations under finance leases | 224 |  |  |  | 230 |  |  |  |  | 224 | 230 |  |  |
Long-term obligations under operating leases | 5,276 |  |  |  | 5,789 |  |  |  |  | 5,276 | 5,789 |  |  |
Other liabilities and deferred credits: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 828 |  |  |  | 220 |  |  |  |  | 828 | 220 |  |  |
Other | 1,010 |  |  |  | 1,021 |  |  |  |  | 1,010 | 1,021 |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 6,715 |  |  |  | 4,603 |  |  |  |  | 6,715 | 4,603 |  |  |
Operating expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  | 2,649 | 2,268 |  |  |
Landing fees and other rent |  |  |  |  |  |  |  |  |  | 2,449 | 2,310 |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,165 | 2,096 |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 38,074 | 34,166 |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 3,229 | 3,618 |  |  |
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (670) | (626) |  |  |
Interest capitalized |  |  |  |  |  |  |  |  |  | 65 | 74 |  |  |
Total nonoperating expense, net |  |  |  |  |  |  |  |  |  | (581) | (595) |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | 2,648 | 3,023 |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 526 | 880 |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ 2,122 | $ 2,143 |  |  |
Earnings per share, basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 7.70 | $ 7.08 |  |  |
Earnings per share, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 7.67 | $ 7.06 |  |  |
ASU 2016-02 | Flight Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease assets | 2,380 |  |  |  | 3,102 |  |  |  |  | $ 2,380 | $ 3,102 |  |  |
ASU 2016-02 | Other Property and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease assets | 2,882 |  |  |  | 2,975 |  |  |  |  | 2,882 | 2,975 |  |  |
ASU 2016-02 | New Lease Standard Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts (2018—$8; 2017—$7) | 80 |  |  |  | 126 |  |  |  |  | 80 | 126 |  |  |
Prepaid expenses and other | (180) |  |  |  | (208) |  |  |  |  | (180) | (208) |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other property and equipment | (1,041) |  |  |  | (922) |  |  |  |  | (1,041) | (922) |  |  |
Less-Accumulated depreciation and amortization (owned) | 140 |  |  |  | 92 |  |  |  |  | 140 | 92 |  |  |
Flight equipment (Finance leases) | (37) |  |  |  | (211) |  |  |  |  | (37) | (211) |  |  |
Less-Accumulated amortization | 8 |  |  |  | 169 |  |  |  |  | 8 | 169 |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current maturities of finance leases | (26) |  |  |  | (50) |  |  |  |  | (26) | (50) |  |  |
Current maturities of operating leases | 719 |  |  |  | 949 |  |  |  |  | 719 | 949 |  |  |
Other | (66) |  |  |  | (58) |  |  |  |  | (66) | (58) |  |  |
Long-term obligations under finance leases | (910) |  |  |  | (766) |  |  |  |  | (910) | (766) |  |  |
Long-term obligations under operating leases | 5,276 |  |  |  | 5,789 |  |  |  |  | 5,276 | 5,789 |  |  |
Other liabilities and deferred credits: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 14 |  |  |  | 16 |  |  |  |  | 14 | 16 |  |  |
Other | (822) |  |  |  | (811) |  |  |  |  | (822) | (811) |  |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 47 |  |  |  | 54 |  |  |  |  | 47 | 54 |  |  |
Operating expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  | 48 | 36 |  |  |
Landing fees and other rent |  |  |  |  |  |  |  |  |  | 90 | 70 |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (75) | (53) |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 63 | 53 |  |  |
Operating income |  |  |  |  |  |  |  |  |  | (63) | (53) |  |  |
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 59 | 45 |  |  |
Interest capitalized |  |  |  |  |  |  |  |  |  | (5) | (10) |  |  |
Total nonoperating expense, net |  |  |  |  |  |  |  |  |  | 53 | 36 |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  | (10) | (17) |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (3) | (16) |  |  |
Net income |  |  |  |  |  |  |  |  |  | $ (7) | $ (1) |  |  |
Earnings per share, basic (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.03) | $ 0.00 |  |  |
Earnings per share, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.03) | $ 0.00 |  |  |
ASU 2016-02 | New Lease Standard Adjustments | Flight Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease assets | 2,380 |  |  |  | 3,102 |  |  |  |  | $ 2,380 | $ 3,102 |  |  |
ASU 2016-02 | New Lease Standard Adjustments | Other Property and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease assets | $ 2,882 |  |  |  | $ 2,975 |  |  |  |  | $ 2,882 | $ 2,975 |  |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[3] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[4] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[5] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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