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Restructuring - Schedule of Restructuring and Restructuring-Related Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 4 $ 16 $ 40 $ 76
Restructuring charges, incurred since inception 122   122  
Restructuring-related charges, incurred since inception 65   65  
Total charges, incurred since inception 187   187  
Network Optimization Project        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0 3 3 5
Restructuring-related charges 5 4 13 12
Total 5 7 16 17
Restructuring charges, incurred since inception 10   10  
Restructuring-related charges, incurred since inception 29   29  
Total charges, incurred since inception 39   39  
Project Phoenix        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 1 10 2 63
Restructuring-related charges 2 5 7 15
Total 3 $ 15 9 $ 78
Restructuring charges, incurred since inception 80   80  
Restructuring-related charges, incurred since inception 26   26  
Total charges, incurred since inception $ 106   $ 106