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Hedging Activities - Additional Information (Detail) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) gal | Dec. 31, 2015 USD ($)
Derivatives And Hedging Activities [Line Items] |  |
Percentage of projection for hedging financial instruments for the remainder of 2016 | 12.00% |
Volume of fuel hedging for the remainder of 2016 | gal | 252,000,000 |
Fuel hedges expiration date | 2016-12 |
Cash Flow Hedging |  |
Derivatives And Hedging Activities [Line Items] |  |
Percentage of projection of European euro for hedging financial instruments for remainder of 2016 | 21.00% |
Fair value of derivative liability | $ 7 | $ 124
Percentage of projection of Japanese yen for hedging financial instruments for remainder of 2016 | 26.00% |
Foreign Currency Derivatives Liability , Net |  |
Derivatives And Hedging Activities [Line Items] |  |
Fair value of derivative liability | $ 1 |
Fuel Derivative Instruments |  |
Derivatives And Hedging Activities [Line Items] |  |
Fuel hedge collateral deposits |  | $ 26

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- Definition Fair value, before effects of master netting arrangements, of a 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: 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=64830801&loc=SL51823488-111719 Reference 2: 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 3: 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=64837297&loc=SL5624163-113959 Reference 4: 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 + Details
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