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Fair Value Measurement - Fair Value Assets and Liabilities Measured on Recurring Basis with Unobservable Inputs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [1] | $ 1,937 | $ 1,360
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance |  | (1,059) | 216
Total gains or (losses) (realized or unrealized) |  |  |
Included in earnings |  | (647) | (439)
Included in other comprehensive income |  | (858) | (1,088)
Purchases |  | 750 | 403
Sales |  | (200) | (170)
Settlements |  | 365 | 19
Ending Balance |  | (1,649) | (1,059)
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 December 31, 2015 |  | (428) | (450)
Fuel derivatives |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance |  | (1,091) | 172
Total gains or (losses) (realized or unrealized) |  |  |
Included in earnings |  | (646) | (439)
Included in other comprehensive income |  | (858) | (1,091)
Purchases | [2] | 750 | 403
Sales | [2] | (196) | (155)
Settlements |  | 365 | 19
Ending Balance |  | (1,676) | (1,091)
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 December 31, 2015 |  | (428) | (450)
Other securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning Balance |  | 32 | 44
Total gains or (losses) (realized or unrealized) |  |  |
Included in earnings |  | (1) | 0
Included in other comprehensive income |  | 0 | 3
Purchases |  | 0 | 0
Sales |  | (4) | (15)
Settlements |  | 0 | 0
Ending Balance |  | 27 | 32
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 December 31, 2015 |  | 0 | $ 0
Quoted prices in active markets for identical assets (Level 1) | Swap | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 0 |
Quoted prices in active markets for identical assets (Level 1) | Options Held | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 0 |
Significant other observable inputs (Level 2) | Swap | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 38 |
Significant other observable inputs (Level 2) | Options Held | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 0 |
Significant unobservable inputs (Level 3) | Swap | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 0 |
Significant unobservable inputs (Level 3) | Options Held | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 10 |
Estimate of Fair Value Measurement [Member] | Swap | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | 38 |
Estimate of Fair Value Measurement [Member] | Options Held | Fair Value, Measurements, Recurring |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [3] | $ 10 |
[1] | Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.
[2] | 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.
[3] | In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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