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

X

- 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.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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