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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Liability derivative contracts, net |  | $ 46 | $ 74
Fuel derivatives | Prepaid expenses and other current assets |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 28 | 26
Gross asset amounts offset in the Balance Sheet |  | (28) | (26)
Liability derivative contracts, net | [1] | 0 | 0
Fuel derivatives | Other Assets |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 30 | 0
Gross asset amounts offset in the Balance Sheet |  | (30) | 0
Liability derivative contracts, net | [1] | 0 | 0
Fuel derivatives | Accrued Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 1,938 | 2,380
Gross asset amounts offset in the Balance Sheet |  | (1,580) | (1,737)
Liability derivative contracts, net | [1] | 358 | 643
Fuel derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 846 | 1,010
Gross asset amounts offset in the Balance Sheet |  | (846) | (985)
Liability derivative contracts, net | [1] | 0 | 25
Interest rate derivatives | Other Noncurrent Liabilities |  |  |
Offsetting Liabilities [Line Items] |  |  |
Gross amounts of recognized liabilities |  | 46 | 49
Gross asset amounts offset in the Balance Sheet |  | 0 | 0
Liability derivative contracts, net | [1] | $ 46 | $ 49
[1] | The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 5.

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- Definition Fair value of financial liability or 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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