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Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net income | $ 329 | $ 259 | $ 946 | $ 542
Other, net of deferred taxes | 1 | 3 | 4 | 4
Total other comprehensive income (loss) | (203) | 134 | (89) | 5
Total comprehensive income | 126 | 393 | 857 | 547
Deferred taxes on unrealized gain (loss) on other | 1 | 2 | 4 | 6
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
AOCI Beginning Balance |  |  | (3) |
AOCI Ending Balance | (92) |  | (92) |
Fuel derivatives |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | (210) | 129 | (101) | (25)
Deferred taxes on unrealized gain (loss) on derivatives | (124) | 76 | (60) | (16)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 6 |  | 4 |
AOCI Beginning Balance | 153 |  | (20) |
Changes in fair value | (340) |  | (165) |
AOCI Ending Balance | (181) |  | (181) |
Interest rate derivatives |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 6 | 2 | 8 | 26
Deferred taxes on unrealized gain (loss) on derivatives | 3 | 2 | 4 | 16
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 6 |  | 17 |
AOCI Beginning Balance | (55) |  | (58) |
Changes in fair value | 3 |  | (5) |
AOCI Ending Balance | (46) |  | (46) |
Defined benefit plan items |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 0 |  | 0 |
AOCI Beginning Balance | 65 |  | 65 |
Changes in fair value | 0 |  | 0 |
AOCI Ending Balance | 65 |  | 65 |
Other |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 0 |  | 0 |
AOCI Beginning Balance | 14 |  | 8 |
Changes in fair value | 2 |  | 8 |
AOCI Ending Balance | 16 |  | 16 |
Deferred tax |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | (4) |  | (8) |
AOCI Beginning Balance | (66) |  | 2 |
Changes in fair value | 124 |  | 60 |
AOCI Ending Balance | 54 |  | 54 |
Accumulated other comprehensive income (loss) |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Reclassification to earnings | 8 |  | 13 |
AOCI Beginning Balance | 111 |  | (3) |
Changes in fair value | (211) |  | (102) |
AOCI Ending Balance | $ (92) |  | $ (92) |

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