Revenue Recognition - Operating Revenues by Principal Geographic Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 3,589	$ 3,326	$ 2,060
Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	3,315	3,051	1,950
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 274	$ 275	$ 110