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Recently Issued Accounting Standards - Schedule of Adoption of ASC 606 and Expected Impact (Statement of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue | $ 11,003 | $ 9,899 | [1] | $ 30,812 | $ 28,333 | [2]
Salaries and related costs | 2,930 | 2,785 | [2] | 8,534 | 8,263 | [2]
Distribution expenses | 427 | 377 | [2] | 1,162 | 1,081 | [2]
Other operating expenses | 1,467 | 1,436 | [2] | 4,293 | 4,126 | [2]
Total operating expenses | 9,800 | 8,761 | [2] | 28,172 | 25,438 | [2]
Operating income | 1,203 | 1,138 | [2] | 2,640 | 2,895 | [2]
Interest expense | (187) | (169) | [2] | (540) | (498) | [2]
Miscellaneous, net | (1) | (13) | [2] | (119) | (82) | [2]
Total nonoperating expense, net | (142) | (145) | [2] | (538) | (475) | [2]
Income before income taxes | 1,061 | 993 | [2] | 2,102 | 2,420 | [2]
Income tax expense | 225 | 348 | [2] | 435 | 855 | [2]
Net income | $ 836 | $ 645 | [2],[3] | $ 1,667 | $ 1,565 | [2],[3]
Earnings per share, basic (in dollars per share) | $ 3.07 | $ 2.15 | [2] | $ 6.02 | $ 5.10 | [2]
Earnings per share, diluted (in dollars per share) | $ 3.06 | $ 2.15 | [2] | $ 5.99 | $ 5.09 | [2]
As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | $ 9,878 |  |  | $ 28,298 |
Salaries and related costs |  | 2,812 |  |  | 8,341 |
Distribution expenses |  | 352 |  |  | 1,021 |
Other operating expenses |  | 1,459 |  |  | 4,199 |
Total operating expenses |  | 8,786 |  |  | 25,529 |
Operating income |  | 1,092 |  |  | 2,769 |
Interest expense |  | (164) |  |  | (472) |
Miscellaneous, net |  | 15 |  |  | (3) |
Total nonoperating expense, net |  | (112) |  |  | (370) |
Income before income taxes |  | 980 |  |  | 2,399 |
Income tax expense |  | 343 |  |  | 848 |
Net income |  | $ 637 |  |  | $ 1,551 |
Earnings per share, basic (in dollars per share) |  | $ 2.12 |  |  | $ 5.06 |
Earnings per share, diluted (in dollars per share) |  | $ 2.12 |  |  | $ 5.04 |
Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | $ 21 |  |  | $ 35 |
Salaries and related costs |  | 0 |  |  | 0 |
Distribution expenses |  | 25 |  |  | 60 |
Other operating expenses |  | (23) |  |  | (73) |
Total operating expenses |  | 2 |  |  | (13) |
Operating income |  | 19 |  |  | 48 |
Interest expense |  | (5) |  |  | (26) |
Miscellaneous, net |  | (1) |  |  | (1) |
Total nonoperating expense, net |  | (6) |  |  | (27) |
Income before income taxes |  | 13 |  |  | 21 |
Income tax expense |  | 5 |  |  | 7 |
Net income |  | $ 8 |  |  | $ 14 |
Earnings per share, basic (in dollars per share) |  | $ 0.03 |  |  | $ 0.04 |
Earnings per share, diluted (in dollars per share) |  | $ 0.03 |  |  | $ 0.05 |
Restatement Adjustment | Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Salaries and related costs |  | $ (27) |  |  | $ (78) |
Distribution expenses |  | 0 |  |  | 0 |
Other operating expenses |  | 0 |  |  | 0 |
Total operating expenses |  | (27) |  |  | (78) |
Operating income |  | 27 |  |  | 78 |
Interest expense |  | 0 |  |  | 0 |
Miscellaneous, net |  | (27) |  |  | (78) |
Total nonoperating expense, net |  | (27) |  |  | (78) |
Income before income taxes |  | 0 |  |  | 0 |
Income tax expense |  | 0 |  |  | 0 |
Net income |  | $ 0 |  |  | $ 0 |
Earnings per share, basic (in dollars per share) |  | $ 0.00 |  |  | $ 0.00 |
Earnings per share, diluted (in dollars per share) |  | $ 0.00 |  |  | $ 0.00 |
Passenger revenue |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue | $ 10,120 | $ 9,069 | [1] | $ 28,150 | $ 25,873 | [2]
Passenger revenue | As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | 8,528 |  |  | 24,324 |
Passenger revenue | Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | 541 |  |  | 1,549 |
Cargo |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue | 296 | 279 | [1] | 903 | 790 | [2]
Cargo | As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | 257 |  |  | 731 |
Cargo | Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | 22 |  |  | 59 |
Other operating revenue |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue | $ 587 | 551 | [1] | $ 1,759 | 1,670 | [2]
Other operating revenue | As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | 1,093 |  |  | 3,243 |
Other operating revenue | Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenue |  | $ (542) |  |  | $ (1,573) |
[1] | 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 I, Item 1 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 I, Item 1 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) 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 I, Item 1 of this report for additional information.

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