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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Passenger revenue | $ 9,880 | $ 9,151 | [1] | $ 18,030 | $ 16,804 | [1]
Cargo | 314 | 273 | [1] | 607 | 511 | [1]
Other operating revenue | 583 | 584 | [1] | 1,172 | 1,119 | [1]
Total operating revenue | 10,777 | 10,008 | [1] | 19,809 | 18,434 | [1]
Salaries and related costs | 2,878 | 2,842 | [1] | 5,604 | 5,478 | [1]
Distribution expenses | 393 | 385 | [1] | 735 | 704 | [1]
Other operating expenses | 1,428 | 1,381 | [1] | 2,826 | 2,690 | [1]
Total operating expenses | 9,616 | 8,571 | [1] | 18,372 | 16,677 | [1]
Operating income | 1,161 | 1,437 | [1] | 1,437 | 1,757 | [1]
Interest expense | (177) | (167) | [1] | (353) | (329) | [1]
Miscellaneous, net | (166) | (27) | [1] | (118) | (69) | [1]
Total nonoperating expense, net | (304) | (160) | [1] | (396) | (330) | [1]
Income before income taxes | 857 | 1,277 | [1] | 1,041 | 1,427 | [1]
Income tax expense | 173 | 456 | [1] | 210 | 507 | [1]
Net income | $ 684 | $ 821 | [1],[2] | $ 831 | $ 920 | [1],[2]
Earnings per share, basic (in dollars per share) | $ 2.49 | $ 2.67 | [1] | $ 2.97 | $ 2.96 | [1]
Earnings per share, diluted (in dollars per share) | $ 2.48 | $ 2.67 | [1] | $ 2.96 | $ 2.96 | [1]
As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Passenger revenue |  | $ 8,622 |  |  | $ 15,796 |
Cargo |  | 254 |  |  | 474 |
Other operating revenue |  | 1,124 |  |  | 2,150 |
Total operating revenue |  | 10,000 |  |  | 18,420 |
Salaries and related costs |  | 2,868 |  |  | 5,529 |
Distribution expenses |  | 362 |  |  | 669 |
Other operating expenses |  | 1,408 |  |  | 2,740 |
Total operating expenses |  | 8,601 |  |  | 16,743 |
Operating income |  | 1,399 |  |  | 1,677 |
Interest expense |  | (158) |  |  | (308) |
Miscellaneous, net |  | (1) |  |  | (18) |
Total nonoperating expense, net |  | (125) |  |  | (258) |
Income before income taxes |  | 1,274 |  |  | 1,419 |
Income tax expense |  | 456 |  |  | 505 |
Net income |  | $ 818 |  |  | $ 914 |
Earnings per share, basic (in dollars per share) |  | $ 2.67 |  |  | $ 2.95 |
Earnings per share, diluted (in dollars per share) |  | $ 2.66 |  |  | $ 2.94 |
Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Passenger revenue |  | $ 529 |  |  | $ 1,008 |
Cargo |  | 19 |  |  | 37 |
Other operating revenue |  | (540) |  |  | (1,031) |
Total operating revenue |  | 8 |  |  | 14 |
Salaries and related costs |  | 0 |  |  | 0 |
Distribution expenses |  | 23 |  |  | 35 |
Other operating expenses |  | (27) |  |  | (50) |
Total operating expenses |  | (4) |  |  | (15) |
Operating income |  | 12 |  |  | 29 |
Interest expense |  | (9) |  |  | (21) |
Miscellaneous, net |  | 0 |  |  | 0 |
Total nonoperating expense, net |  | (9) |  |  | (21) |
Income before income taxes |  | 3 |  |  | 8 |
Income tax expense |  | 0 |  |  | 2 |
Net income |  | $ 3 |  |  | $ 6 |
Earnings per share, basic (in dollars per share) |  | $ 0.00 |  |  | $ 0.01 |
Earnings per share, diluted (in dollars per share) |  | $ 0.01 |  |  | $ 0.02 |
Restatement Adjustment | Accounting Standards Update 2017-06 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Passenger revenue |  | $ 0 |  |  | $ 0 |
Cargo |  | 0 |  |  | 0 |
Other operating revenue |  | 0 |  |  | 0 |
Total operating revenue |  | 0 |  |  | 0 |
Salaries and related costs |  | (26) |  |  | (51) |
Distribution expenses |  | 0 |  |  | 0 |
Other operating expenses |  | 0 |  |  | 0 |
Total operating expenses |  | (26) |  |  | (51) |
Operating income |  | 26 |  |  | 51 |
Interest expense |  | 0 |  |  | 0 |
Miscellaneous, net |  | (26) |  |  | (51) |
Total nonoperating expense, net |  | (26) |  |  | (51) |
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 |
[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.

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