Revenue - Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 11,429	$ 7,566
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	7,167	5,086
Atlantic (including Europe, Africa, India and Middle East destinations)
Disaggregation of Revenue [Line Items]
Total operating revenue	1,832	1,089
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	1,316	909
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 1,114	$ 482