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Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Fuel and oil | $ (936) | $ (1,386) | $ (2,818) | $ (4,125)
Less: Tax Expense | 349 | $ 196 | 987 | $ 569
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of Tax | 82 |  | 175 |
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Fuel and oil | 126 |  | 264 |
Less: Tax Expense | 47 |  | 98 |
Net of Tax | 79 |  | 166 |
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Expense | 5 |  | 15 |
Less: Tax Expense | 2 |  | 6 |
Net of Tax | $ 3 |  | $ 9 |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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