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v2.4.1.9

Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net income | $ 1,136 us-gaap_NetIncomeLoss | $ 754 us-gaap_NetIncomeLoss | $ 421 us-gaap_NetIncomeLoss
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of ($8), $15, and ($11) | (16)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 24 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | (17)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other, net of deferred taxes of $0, $7, and $3 | 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 9 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
OTHER COMPREHENSIVE INCOME (LOSS) | (735)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 116 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 105 us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME | 401 us-gaap_ComprehensiveIncomeNetOfTax | 870 us-gaap_ComprehensiveIncomeNetOfTax | 526 us-gaap_ComprehensiveIncomeNetOfTax
Fuel derivatives |  |  |
Unrealized gain (loss) on derivatives, net of tax | (727)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 52 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 120 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Interest rate derivatives |  |  |
Unrealized gain (loss) on derivatives, net of tax | $ 8 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 31 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ (1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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