Commitments and Contingencies - Narrative (Details) - Future aircraft purchase commitments $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) aircraft
Future Purchase Commitments
Future aircraft purchase commitments | $	$ 16,170
A321neo
Future Purchase Commitments
Number of aircraft with options converted to firm order	55
Number of options replenished	25
A350-900
Future Purchase Commitments
Number of aircraft for which delivery date has been accelerated	2
Number aircraft related to lease commitments entered	9
A330-900neo
Future Purchase Commitments
Number of aircraft for which delivery date has been accelerated	1
B-737-900ER
Future Purchase Commitments
Number of aircraft per agreement	29