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Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Fuel and oil | $ (903) | $ (1,005) | $ (1,755) | $ (1,882)
Interest Expense | (32) | (29) | (62) | (62)
Less: Tax Expense | 484 | $ 369 | 787 | $ 638
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of Tax | 152 |  | 349 |
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Fuel and oil | 236 |  | 546 |
Less: Tax Expense | 87 |  | 202 |
Net of Tax | 149 |  | 344 |
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Expense | 4 |  | 8 |
Less: Tax Expense | 1 |  | 3 |
Net of Tax | $ 3 |  | $ 5 |

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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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