Geographic and Customer Concentrations - Revenue from Geographical Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 7,037	$ 7,493	$ 7,952
North America
Disaggregation of Revenue [Line Items]
Total operating revenue	6,345	6,256	6,365
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total operating revenue	628	734	805
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 64	$ 503	$ 782