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Accumulated Other Comprehensive Income (Loss) - Details about Accumulated Other Comprehensive Income Components (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amortization of unrecognized losses and prior service cost | $ (166) | $ (27) | [1] | $ (118) | $ (69) | [1]
Reclassifications of losses into earnings related to fuel derivative contracts | 2,390 | 1,669 | [1] | 4,355 | 3,229 | [1]
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement liabilities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amortization of unrecognized losses and prior service cost | 14 | 14 |  | 30 | 27 |
Reclassification out of Accumulated Other Comprehensive Income | Investments and Other |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Reclassifications of losses into earnings related to fuel derivative contracts | $ 0 | $ 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 I, Item 1 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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