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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

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