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Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Net income | $ 351 | $ 513 |
Total other comprehensive income (loss) | 11 | 157 |
Total comprehensive income | 362 | 670 |
Deferred taxes on unrealized gain (loss) on other | 0 | 0 |
Interest Expense | 29 | 30 |
Fuel and oil | 922 | 852 |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (312) |  | $ (323)
Reclassification to earnings | 90 |  |
Changes in fair value | (79) |  |
Fuel derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (485) |  | (499)
Changes in fair value | (125) |  |
Interest rate derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (15) |  | (18)
Changes in fair value | 0 |  |
Defined benefit plan items |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (14) |  | (14)
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 | 182 |  | 188
Reclassification to earnings | (52) |  |
Changes in fair value | 46 |  |
Other |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 20 |  | $ 20
Reclassification to earnings | 0 |  |
Changes in fair value | 0 |  |
Interest rate derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gain (loss) on derivatives, net of tax | 2 | (3) |
Deferred taxes on unrealized gain (loss) on derivatives | 1 | (1) |
Fuel derivatives |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Unrealized gain (loss) on derivatives, net of tax | 9 | 160 |
Deferred taxes on unrealized gain (loss) on derivatives | $ 5 | $ 93 |

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