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Revenue - Passenger Revenue Breakout (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue
Operating Revenue	$ 9,048	$ 22,428	$ 21,965
Passenger Revenue Non Loyalty
Disaggregation of Revenue
Operating Revenue	6,303	17,578	17,506
Passenger Loyalty Air Transportation
Disaggregation of Revenue
Operating Revenue	1,003	2,487	2,307
Passenger Ancillary Sold Separately
Disaggregation of Revenue
Operating Revenue	359	711	642
Passenger
Disaggregation of Revenue
Operating Revenue	$ 7,665	$ 20,776	$ 20,455

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