Revenue - Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Operating revenue	$ 12,877	$ 7,750	$ 32,555	$ 16,442
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Operating revenue	7,718	5,412	20,623	11,290
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	3,186	1,116	6,756	2,111
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	1,162	849	3,266	1,968
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 811	$ 373	$ 1,910	$ 1,073