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Significant Accounting Policies - 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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statements of Consolidated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  | $ 2,849 | $ 2,649 | [1] | $ 2,268 | [1]
Landing fees and other rent |  |  |  |  |  |  |  |  |  | 2,543 | 2,449 | [1] | 2,310 | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 2,288 | 2,165 | [1],[2] | 2,096 | [1],[2]
Interest expense |  |  |  |  |  |  |  |  |  |  | (670) |  | (626) |
Interest capitalized |  |  |  |  |  |  |  |  |  | 85 | 65 | [1] | 74 | [1]
Income tax expense |  |  |  |  |  |  |  |  |  | 905 | 526 | [1] | 880 | [1]
Net income | $ 641 | $ 1,024 | $ 1,052 | $ 292 | $ 461 |  | $ 833 | $ 683 | $ 145 | $ 3,009 | $ 2,122 | [1],[2],[3],[4] | $ 2,143 | [1],[2],[3],[4]
Earnings per share, basic (in dollars per share) | $ 2.54 | $ 4.01 | $ 4.03 | $ 1.09 | $ 1.70 |  | $ 3.06 | $ 2.48 | $ 0.51 | $ 11.63 | $ 7.70 | [1] | $ 7.08 | [1]
Earnings per share, diluted (in dollars per share) | $ 2.53 | $ 3.99 | $ 4.02 | $ 1.09 | $ 1.69 |  | $ 3.05 | $ 2.48 | $ 0.51 | $ 11.58 | $ 7.67 | [1] | $ 7.06 | [1]
Consolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts | $ 1,364 |  |  |  | $ 1,426 | [5] |  |  |  | $ 1,364 | $ 1,426 | [5] |  |
Prepaid expenses and other | 814 |  |  |  | 733 | [5] |  |  |  | 814 | 733 | [5] |  |
Flight equipment, owned and finance leases |  |  |  |  | 32,599 |  |  |  |  |  | 32,599 |  |  |
Other property and equipment, owned and finance leases | 7,926 |  |  |  | 6,889 | [5] |  |  |  | 7,926 | 6,889 | [5] |  |
Accumulated depreciation and amortization, owned and finance leases |  |  |  |  | (13,266) |  |  |  |  |  | (13,266) |  |  |
Operating lease right-of-use assets | 4,758 |  |  |  | 5,262 | [5] |  |  |  | 4,758 | 5,262 | [5] |  |
Current maturities of finance leases | 46 |  |  |  | 123 | [5] |  |  |  | 46 | 123 | [5] |  |
Current maturities of operating leases | 686 |  |  |  | 719 | [5] |  |  |  | 686 | 719 | [5] |  |
Other current liabilities | 566 |  |  |  | 553 | [5] |  |  |  | 566 | 553 | [5] |  |
Long-term obligations under finance leases | 220 |  |  |  | 224 | [5] |  |  |  | 220 | 224 | [5] |  |
Long-term obligations under operating leases | 4,946 |  |  |  | 5,276 | [5] |  |  |  | 4,946 | 5,276 | [5] |  |
Deferred income taxes | 1,736 |  |  |  | 828 | [5] |  |  |  | 1,736 | 828 | [5] |  |
Other long-term liabilities | 1,024 |  |  |  | 1,010 | [5] |  |  |  | 1,024 | 1,010 | [5] |  |
Retained earnings | $ 9,716 |  |  |  | 6,715 | [5] |  |  |  | 9,716 | 6,715 | [5] |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 6,909 | 6,164 | [2] | $ 3,474 | [2]
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | (4,528) | (4,070) | [2] | (3,870) | [2]
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  | 1,847 | 1,594 | [2] | 2,537 | [2]
Principal payments under finance leases |  |  |  |  |  |  |  |  |  | $ (151) | (79) | [2] | (84) | [2]
As Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statements of Consolidated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  |  | 2,601 |  | 2,232 |
Landing fees and other rent |  |  |  |  |  |  |  |  |  |  | 2,359 |  | 2,240 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 2,240 |  | 2,149 |
Interest expense |  |  |  |  |  |  |  |  |  |  | (729) |  | (671) |
Interest capitalized |  |  |  |  |  |  |  |  |  |  | 70 |  | 84 |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 529 |  | 896 |
Net income |  |  |  |  |  |  |  |  |  |  | $ 2,129 |  | $ 2,144 |
Earnings per share, basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 7.73 |  | $ 7.08 |
Earnings per share, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 7.70 |  | $ 7.06 |
Consolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts |  |  |  |  | 1,346 |  |  |  |  |  | $ 1,346 |  |  |
Prepaid expenses and other |  |  |  |  | 913 |  |  |  |  |  | 913 |  |  |
Flight equipment, owned and finance leases |  |  |  |  | 32,636 |  |  |  |  |  | 32,636 |  |  |
Other property and equipment, owned and finance leases |  |  |  |  | 7,930 |  |  |  |  |  | 7,930 |  |  |
Accumulated depreciation and amortization, owned and finance leases |  |  |  |  | (13,414) |  |  |  |  |  | (13,414) |  |  |
Operating lease right-of-use assets |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Current maturities of finance leases |  |  |  |  | 149 |  |  |  |  |  | 149 |  |  |
Current maturities of operating leases |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Other current liabilities |  |  |  |  | 619 |  |  |  |  |  | 619 |  |  |
Long-term obligations under finance leases |  |  |  |  | 1,134 |  |  |  |  |  | 1,134 |  |  |
Long-term obligations under operating leases |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |
Deferred income taxes |  |  |  |  | 814 |  |  |  |  |  | 814 |  |  |
Other long-term liabilities |  |  |  |  | 1,832 |  |  |  |  |  | 1,832 |  |  |
Retained earnings |  |  |  |  | 6,668 |  |  |  |  |  | 6,668 |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 6,181 |  | $ 3,413 |
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | (4,177) |  | (3,998) |
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | 1,740 |  | 2,765 |
Principal payments under finance leases |  |  |  |  |  |  |  |  |  |  | (134) |  | (124) |
ASU 2016-02 | New Lease Standard Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statements of Consolidated Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regional capacity purchase |  |  |  |  |  |  |  |  |  |  | 48 |  | 36 |
Landing fees and other rent |  |  |  |  |  |  |  |  |  |  | 90 |  | 70 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | (75) |  | (53) |
Interest expense |  |  |  |  |  |  |  |  |  |  | 59 |  | 45 |
Interest capitalized |  |  |  |  |  |  |  |  |  |  | (5) |  | (10) |
Income tax expense |  |  |  |  |  |  |  |  |  |  | (3) |  | (16) |
Net income |  |  |  |  |  |  |  |  |  |  | $ (7) |  | $ (1) |
Earnings per share, basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.03) |  | $ 0 |
Earnings per share, diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ (0.03) |  | $ 0 |
Consolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables, less allowance for doubtful accounts |  |  |  |  | 80 |  |  |  |  |  | $ 80 |  |  |
Prepaid expenses and other |  |  |  |  | (180) |  |  |  |  |  | (180) |  |  |
Flight equipment, owned and finance leases |  |  |  |  | (37) |  |  |  |  |  | (37) |  |  |
Other property and equipment, owned and finance leases |  |  |  |  | (1,041) |  |  |  |  |  | (1,041) |  |  |
Accumulated depreciation and amortization, owned and finance leases |  |  |  |  | 148 |  |  |  |  |  | 148 |  |  |
Operating lease right-of-use assets |  |  |  |  | 5,262 |  |  |  |  |  | 5,262 |  |  |
Current maturities of finance leases |  |  |  |  | (26) |  |  |  |  |  | (26) |  |  |
Current maturities of operating leases |  |  |  |  | 719 |  |  |  |  |  | 719 |  |  |
Other current liabilities |  |  |  |  | (66) |  |  |  |  |  | (66) |  |  |
Long-term obligations under finance leases |  |  |  |  | (910) |  |  |  |  |  | (910) |  |  |
Long-term obligations under operating leases |  |  |  |  | 5,276 |  |  |  |  |  | 5,276 |  |  |
Deferred income taxes |  |  |  |  | 14 |  |  |  |  |  | 14 |  |  |
Other long-term liabilities |  |  |  |  | (822) |  |  |  |  |  | (822) |  |  |
Retained earnings |  |  |  |  | $ 47 |  |  |  |  |  | 47 |  |  |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | (17) |  | $ 61 |
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 107 |  | 128 |
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  | (146) |  | (228) |
Principal payments under finance leases |  |  |  |  |  |  |  |  |  |  | $ 55 |  | $ 40 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). 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. 2016-02, Leases (Topic 842). 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. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8
[4] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). 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. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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