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Accumulated Other Comprehensive Income (Loss) - Details about AOCI Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Aircraft fuel | $ 9,307 | $ 6,913 | [1] | $ 5,813 | [1]
Miscellaneous, net | 76 | 101 | [1] | 11 | [1]
Fuel derivative contracts | Amount Reclassified from AOCI to Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Aircraft fuel | 0 | 2 |  | 217 |
Pension and Postretirement liabilities and other | Amount Reclassified from AOCI to Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Miscellaneous, net | 62 | 58 |  | 26 |
Investments and other | Amount Reclassified from AOCI to Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Miscellaneous, net | $ 0 | $ 0 |  | $ (2) |
[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 II, Item 8 of this report for additional information.

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- Definition Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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