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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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Mar. 31, 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 |  | $ (1,028) | $ (1,028) | $ (1,218) | $ (1,059)
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | (85) | 9 |  |
Included in other comprehensive income |  | 50 | (29) |  |
Purchases |  | 182 | 244 |  |
Sales |  | (127) | (175) |  |
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 June 30, 2015 |  | 85 | (8) |  |
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 |  | (1,055) | (1,055) | $ (1,245) | $ (1,091)
Total gains or (losses) (realized or unrealized) |  |  |  |  |
Included in earnings |  | (85) | 8 |  |
Included in other comprehensive income |  | 50 | (29) |  |
Purchases | [1] | 182 | 244 |  |
Sales | [1] | (127) | (171) |  |
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 June 30, 2015 |  | 85 | (8) |  |
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 |  |
June 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 June 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) |  |
June 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 June 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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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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