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Revenue Recognition - Operating Revenues by Principal Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 973 $ 967 $ 1,838 $ 1,815
Domestic        
Disaggregation of Revenue [Line Items]        
Total operating revenues 904 877 1,706 1,658
Latin America        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 69 $ 90 $ 132 $ 157