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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fuel derivatives | Prepaid expenses and other current assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | $ 41 | $ 0
Gross amounts offset in the Balance Sheet |  | (26) | 0
Net amounts of assets presented in the Balance Sheet (a) | [1] | 15 | 0
Fuel derivatives | Other Assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 7 | 0
Gross amounts offset in the Balance Sheet |  | 0 | 0
Net amounts of assets presented in the Balance Sheet (a) | [1] | 7 | 0
Fuel derivatives | Accrued Liabilities |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 1,737 | 1,258
Gross amounts offset in the Balance Sheet |  | (1,737) | (1,258)
Net amounts of assets presented in the Balance Sheet (a) | [1] | 0 | 0
Fuel derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 985 | 355
Gross amounts offset in the Balance Sheet |  | (985) | (355)
Net amounts of assets presented in the Balance Sheet (a) | [1] | 0 | 0
Interest rate derivatives | Other Assets |  |  |
Offsetting Assets [Line Items] |  |  |
Gross amounts of recognized assets |  | 2 | 13
Gross amounts offset in the Balance Sheet |  | 0 | 0
Net amounts of assets presented in the Balance Sheet (a) | [1] | $ 2 | $ 13
[1] | The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

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- Definition Fair value of 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, 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 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226052-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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