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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 2,052	$ 4,234
Passenger Revenue Non Loyalty
Disaggregation of Revenue [Line Items]
Operating Revenue	1,354	3,220
Passenger Loyalty Air Transportation
Disaggregation of Revenue [Line Items]
Operating Revenue	278	461
Passenger Ancillary Sold Separately
Disaggregation of Revenue [Line Items]
Operating Revenue	80	164
Passenger
Disaggregation of Revenue [Line Items]
Operating Revenue	$ 1,712	$ 3,845

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