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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Net income | $ 820 | $ 608 | $ 1,333 | $ 1,061 |  |
Total other comprehensive income (loss) | 266 | 78 | 423 | 74 |  |
Total comprehensive income | 1,086 | 686 | 1,756 | 1,135 |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (628) |  | (628) |  | $ (894) | $ (1,051)
Reclassification to earnings | 152 |  | 349 |  |  |
Changes in fair value | 114 |  | 74 |  |  |
Fuel derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (993) |  | (993) |  | (1,413) | (1,666)
Reclassification to earnings | 236 |  | 546 |  |  |
Changes in fair value | 184 |  | 127 |  |  |
Interest rate derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (32) |  | (32) |  | (34) | (30)
Reclassification to earnings | 4 |  | 8 |  |  |
Changes in fair value | (2) |  | (10) |  |  |
Defined benefit plan items |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 22 |  | 22 |  | 22 | 22
Reclassification to earnings | 0 |  | 0 |  |  |
Changes in fair value | 0 |  | 0 |  |  |
Other |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 6 |  | 6 |  | 6 | 6
Reclassification to earnings | 0 |  | 0 |  |  |
Changes in fair value | 0 |  | 0 |  |  |
Deferred tax |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 369 |  | 369 |  | $ 525 | $ 617
Reclassification to earnings | (88) |  | (205) |  |  |
Changes in fair value | (68) |  | (43) |  |  |
Interest rate derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 1 | 4 | (1) | 3 |  |
Deferred taxes on unrealized gain (loss) on derivatives | 1 | 2 | (1) | 2 |  |
Fuel derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 265 | 74 | 424 | 71 |  |
Deferred taxes on unrealized gain (loss) on derivatives | $ 155 | $ 44 | $ 249 | $ 43 |  |

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