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Revenue Recognition - Operating Revenues by Principal Geographic Region (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 2,060 $ 1,250 $ 2,508
Domestic      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,950 1,201 2,362
Latin America      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 110 $ 49 $ 146