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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Net income | $ 511 | $ 453 |
Total other comprehensive income (loss) | 157 | (4) |
Total comprehensive income | 668 | 449 |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (894) |  | $ (1,051)
Reclassification to earnings | 197 |  |
Changes in fair value | (40) |  |
Fuel derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,413) |  | (1,666)
Reclassification to earnings | 310 |  |
Changes in fair value | (57) |  |
Interest rate derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (34) |  | (30)
Reclassification to earnings | 4 |  |
Changes in fair value | (8) |  |
Defined benefit plan items |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 22 |  | 22
Reclassification to earnings | 0 |  |
Changes in fair value | 0 |  |
Other |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 6 |  | 6
Reclassification to earnings | 0 |  |
Changes in fair value | 0 |  |
Deferred tax |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 525 |  | $ 617
Reclassification to earnings | (117) |  |
Changes in fair value | 25 |  |
Interest rate derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gain (loss) on derivatives, net of tax | (3) | (1) |
Deferred taxes on unrealized gain (loss) on derivatives | (1) | 0 |
Fuel derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gain (loss) on derivatives, net of tax | 160 | (3) |
Deferred taxes on unrealized gain (loss) on derivatives | $ 94 | $ (1) |

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