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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Net income | $ 584 | $ 329 | $ 1,645 | $ 946 |  |
Other, net of deferred taxes | (3) | 1 | (4) | 4 |  |
Total other comprehensive income (loss) | (239) | (203) | (165) | (89) |  |
Total comprehensive income | 345 | 126 | 1,480 | 857 |  |
Deferred taxes on unrealized gain (loss) on other | (2) | 1 | (1) | 4 |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (903) |  | (903) |  | $ (664) | $ (738)
Reclassification to earnings | 82 |  | 175 |  |  |
Changes in fair value | (321) |  | (340) |  |  |
Fuel derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (1,438) |  | (1,438) |  | (1,063) | (1,177)
Reclassification to earnings | 126 |  | 264 |  |  |
Changes in fair value | (501) |  | (525) |  |  |
Interest rate derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (40) |  | (40) |  | (40) | (45)
Reclassification to earnings | 5 |  | 15 |  |  |
Changes in fair value | (5) |  | (10) |  |  |
Defined benefit plan items |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 41 |  | 41 |  | 41 | 41
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 | 3 |  | 3 |  | 8 | 8
Reclassification to earnings | 0 |  | 0 |  |  |
Changes in fair value | (5) |  | (5) |  |  |
Deferred tax |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 531 |  | 531 |  | $ 390 | $ 435
Reclassification to earnings | (49) |  | (104) |  |  |
Changes in fair value | 190 |  | 200 |  |  |
Interest rate derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 0 | 6 | 3 | 8 |  |
Deferred taxes on unrealized gain (loss) on derivatives | 0 | 3 | 2 | 4 |  |
Fuel derivatives |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | (236) | (210) | (164) | (101) |  |
Deferred taxes on unrealized gain (loss) on derivatives | $ (139) | $ (124) | $ (97) | $ (60) |  |

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