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Fair Value Measurement - Fair Value Assets and Liabilities Measured on Recurring Basis with Unobservable Inputs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | $ (1,342) | $ (1,342) | $ (1,028) | $ (1,059)
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | 405 | 414 |  |
Included in other comprehensive income |  | (488) | (517) |  |
Purchases |  | 408 | 652 |  |
Sales |  | (11) | (186) |  |
Settlements |  | (182) | (182) |  |
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 |  | (317) | (324) |  |
Fuel derivatives |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | (1,369) | (1,369) | $ (1,055) | $ (1,091)
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | 405 | 413 |  |
Included in other comprehensive income |  | (488) | (517) |  |
Purchases | [1] | 408 | 652 |  |
Sales | [1] | (11) | (182) |  |
Settlements |  | (182) | (182) |  |
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 |  | (317) | (324) |  |
Auction rate securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance |  | 27 | 27 |  |
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | 0 | 0 |  |
Included in other comprehensive income |  | 0 | 0 |  |
Purchases |  | 0 | 0 |  |
Sales |  | 0 | 0 |  |
Settlements |  | 0 | 0 |  |
September 30, 2015 | [2] | 27 | 27 |  |
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 |  | 0 | 0 |  |
Other securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning Balance |  | 0 | 5 |  |
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | 0 | 1 |  |
Included in other comprehensive income |  | 0 | 0 |  |
Purchases |  | 0 | 0 |  |
Sales |  | 0 | (4) |  |
Settlements |  | 0 | 0 |  |
September 30, 2015 |  | 0 | 0 |  |
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2015 |  | $ 0 | $ 0 |  |
[1] | The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.
[2] | Included in Other assets in the unaudited Condensed Consolidated Balance Sheet.

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