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Restructuring - Schedule of Restructuring and Restructuring-Related Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 10 $ 22 $ 36 $ 60
Restructuring charges, incurred since inception 120   120  
Restructuring-related charges, incurred since inception 56   56  
Total charges, incurred since inception 176   176  
Network Optimization Project        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0 2 3 2
Restructuring-related charges 6 8 8 8
Total 6 10 11 10
Restructuring charges, incurred since inception 10   10  
Restructuring-related charges, incurred since inception 24   24  
Total charges, incurred since inception 34   34  
Project Phoenix        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 0 17 1 53
Restructuring-related charges 2 4 5 10
Total 2 $ 21 6 $ 63
Restructuring charges, incurred since inception 79   79  
Restructuring-related charges, incurred since inception 24   24  
Total charges, incurred since inception $ 103   $ 103