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Change in Accounting Estimate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | $ 0 | $ 0 | $ 172
Rapid Rewards Frequent Flier Liability | $ 1,600 | 1,400 |
Estimated Impact | 1.00% |  |
Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | $ 638 | 610 |
Rapid Rewards Frequent Flier Liability | 59 |  |
Minimum | Accounting Standards Update 2014-09 |  |  |
Increase (Decrease) in Frequent Flyer Liability | 1,000 |  |
Maximum | Accounting Standards Update 2014-09 |  |  |
Increase (Decrease) in Frequent Flyer Liability | 1,200 |  |
Reclassification from Other to Passenger Revenue |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | 135 | 153 |
Reclassification from Salaries, wages, and benefits to Other (gains) and losses |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | 14 | 12 |
Reclassification from Other operating expenses to be offset against Passenger revenues | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | 40 | $ 40 |
Accumulated other comprehensive income (loss) |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption | $ 20 |  |

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- Definition Value of revenue deferred or cost to provide future products or services, primarily air transportation, associated with programs used by airlines to encourage passenger loyalty by providing rewards geared to the frequency of travel on the sponsoring airline, typically in the form of frequent flyer miles, points, or segments that can be accumulated and converted into free or discounted travel or other redemption options. Used to reflect the current portion of the liability (within one year or within the normal operating cycle if longer). + References No definition available. + Details
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