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Quarterly Financial Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Revenues	$ 4,628us-gaap_Revenues	[1]	$ 4,800us-gaap_Revenues	$ 5,011us-gaap_Revenues	$ 4,166us-gaap_Revenues	$ 4,428us-gaap_Revenues	$ 4,545us-gaap_Revenues	$ 4,643us-gaap_Revenues	$ 4,084us-gaap_Revenues	$ 18,605us-gaap_Revenues	$ 17,699us-gaap_Revenues	$ 17,088us-gaap_Revenues
Operating income	621us-gaap_OperatingIncomeLoss		614us-gaap_OperatingIncomeLoss	775us-gaap_OperatingIncomeLoss	215us-gaap_OperatingIncomeLoss	386us-gaap_OperatingIncomeLoss	390us-gaap_OperatingIncomeLoss	433us-gaap_OperatingIncomeLoss	70us-gaap_OperatingIncomeLoss	2,225us-gaap_OperatingIncomeLoss	1,278us-gaap_OperatingIncomeLoss	623us-gaap_OperatingIncomeLoss
Income (loss) before income taxes	302us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		525us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	746us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	244us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	334us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	419us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	363us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,209us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	685us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income (loss)	$ 190us-gaap_NetIncomeLoss		$ 329us-gaap_NetIncomeLoss	$ 465us-gaap_NetIncomeLoss	$ 152us-gaap_NetIncomeLoss	$ 212us-gaap_NetIncomeLoss	$ 259us-gaap_NetIncomeLoss	$ 224us-gaap_NetIncomeLoss	$ 59us-gaap_NetIncomeLoss	$ 1,136us-gaap_NetIncomeLoss	$ 754us-gaap_NetIncomeLoss	$ 421us-gaap_NetIncomeLoss
Basic (in dollars per share)	$ 0.28us-gaap_EarningsPerShareBasic	[1]	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.06us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.28us-gaap_EarningsPerShareDiluted	[1]	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.31us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 1.64us-gaap_EarningsPerShareDiluted	$ 1.05us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted
[1] Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $55 million and increased both Basic and Diluted net income per share by $.04. See Note 1 for further detail.

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