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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 | $ 4,628 us-gaap_Revenues | [1] | $ 4,800 us-gaap_Revenues | $ 5,011 us-gaap_Revenues | $ 4,166 us-gaap_Revenues | $ 4,428 us-gaap_Revenues | $ 4,545 us-gaap_Revenues | $ 4,643 us-gaap_Revenues | $ 4,084 us-gaap_Revenues | $ 18,605 us-gaap_Revenues | $ 17,699 us-gaap_Revenues | $ 17,088 us-gaap_Revenues
Operating income | 621 us-gaap_OperatingIncomeLoss |  | 614 us-gaap_OperatingIncomeLoss | 775 us-gaap_OperatingIncomeLoss | 215 us-gaap_OperatingIncomeLoss | 386 us-gaap_OperatingIncomeLoss | 390 us-gaap_OperatingIncomeLoss | 433 us-gaap_OperatingIncomeLoss | 70 us-gaap_OperatingIncomeLoss | 2,225 us-gaap_OperatingIncomeLoss | 1,278 us-gaap_OperatingIncomeLoss | 623 us-gaap_OperatingIncomeLoss
Income (loss) before income taxes | 302 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 525 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 746 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 244 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 334 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 419 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 363 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 94 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,816 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,209 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 685 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income (loss) | $ 190 us-gaap_NetIncomeLoss |  | $ 329 us-gaap_NetIncomeLoss | $ 465 us-gaap_NetIncomeLoss | $ 152 us-gaap_NetIncomeLoss | $ 212 us-gaap_NetIncomeLoss | $ 259 us-gaap_NetIncomeLoss | $ 224 us-gaap_NetIncomeLoss | $ 59 us-gaap_NetIncomeLoss | $ 1,136 us-gaap_NetIncomeLoss | $ 754 us-gaap_NetIncomeLoss | $ 421 us-gaap_NetIncomeLoss
Basic (in dollars per share) | $ 0.28 us-gaap_EarningsPerShareBasic | [1] | $ 0.48 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ 1.65 us-gaap_EarningsPerShareBasic | $ 1.06 us-gaap_EarningsPerShareBasic | $ 0.56 us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.28 us-gaap_EarningsPerShareDiluted | [1] | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.37 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 1.64 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 0.56 us-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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