Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Property and Equipment (Details)

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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment      
Property, Plant and Equipment, Gross $ 1,475 $ 1,661  
Depreciation 102 158 $ 167
Land      
Property, Plant and Equipment      
Property, Plant and Equipment, Gross 68 73  
Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment, Gross 421 453  
Support equipment      
Property, Plant and Equipment      
Property, Plant and Equipment, Gross 917 1,041  
Projects in progress      
Property, Plant and Equipment      
Property, Plant and Equipment, Gross 59 77  
Finance lease right-of-use ("ROU") assets      
Property, Plant and Equipment      
Property, Plant and Equipment, Gross $ 10 $ 17  
Minimum | Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful Life 8 years    
Minimum | Support equipment      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful Life 2 years    
Maximum | Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful Life 20 years    
Maximum | Support equipment      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful Life 9 years