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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net income | $ 608 | $ 465 | $ 1,061 | $ 617
Other, net of deferred taxes | 0 | 2 | 0 | 3
Total other comprehensive income (loss) | 78 | 123 | 74 | 114
Total comprehensive income | 686 | 588 | 1,135 | 731
Deferred taxes on unrealized gain (loss) on other | 0 | 1 | 0 | 33
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  |  | (738) |
AOCI Ending Balance | (664) |  | (664) |
Fuel derivatives |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 74 | 121 | 71 | 109
Deferred taxes on unrealized gain (loss) on derivatives | 44 | 72 | 43 | 64
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 65 |  | 138 |
AOCI Beginning Balance | (1,181) |  | (1,177) |
Changes in fair value | 53 |  | (24) |
AOCI Ending Balance | (1,063) |  | (1,063) |
Interest rate derivatives |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 4 | 0 | 3 | 2
Deferred taxes on unrealized gain (loss) on derivatives | 2 | $ 0 | 2 | $ 1
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 5 |  | 10 |
AOCI Beginning Balance | (46) |  | (45) |
Changes in fair value | 1 |  | (5) |
AOCI Ending Balance | (40) |  | (40) |
Defined benefit plan items |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 0 |  | 0 |
AOCI Beginning Balance | 41 |  | 41 |
Changes in fair value | 0 |  | 0 |
AOCI Ending Balance | 41 |  | 41 |
Other |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 0 |  | 0 |
AOCI Beginning Balance | 8 |  | 8 |
Changes in fair value | 0 |  | 0 |
AOCI Ending Balance | 8 |  | 8 |
Deferred tax |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | (26) |  | (55) |
AOCI Beginning Balance | 436 |  | 435 |
Changes in fair value | (20) |  | 10 |
AOCI Ending Balance | 390 |  | 390 |
Accumulated other comprehensive income (loss) |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 44 |  | 93 |
AOCI Beginning Balance | (742) |  | (738) |
Changes in fair value | 34 |  | (19) |
AOCI Ending Balance | $ (664) |  | $ (664) |

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