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Net Income Per Share (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
NUMERATOR:
Net income	$ 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
Incremental income effect of interest on 5.25% convertible notes										4us-gaap_InterestOnConvertibleDebtNetOfTax	3us-gaap_InterestOnConvertibleDebtNetOfTax	3us-gaap_InterestOnConvertibleDebtNetOfTax
Net income after assumed conversion										$ 1,140us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 757us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 424us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
DENOMINATOR:
Weighted-average shares outstanding, basic										687us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	710us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	750us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of Employee stock options and restricted stock units										3us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive effect of 5.25% convertible notes										6us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities	6us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities	6us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Adjusted weighted-average shares outstanding, diluted										696us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	718us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	757us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
NET INCOME PER SHARE:
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
Stock Options
Potentially dilutive amounts excluded from calculations:
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[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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