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New Accounting Pronouncement and Changes in Accounting or Estimates (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2016 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue | $ 115
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ 62
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share | $ / shares | $ 0.10
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share | $ / shares | $ 0.09
Passenger Revenue |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount | $ (54)
Other Revenue |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount | $ 169

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