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New Accounting Pronouncement and Changes in Accounting or Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue	$ 137	$ 261
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 73	$ 139
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share	$ 0.12	$ 0.22
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share	$ 0.11	$ 0.22
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	$ (66)	$ (120)
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	$ 203	$ 381

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The amount of revenue recognized in earnings during the reporting period associated with arrangements entered into or modified after adoption of the new accounting pronouncement or change in accounting principle.

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