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Restructuring - Schedule of Restructuring and Restructuring-related Charges Incurred From Inception (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception $ 120
Restructuring-related charges, incurred since inception 56
Total charges, incurred since inception 176
Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 31
Restructuring-related charges, incurred since inception 8
Total charges, incurred since inception 39
Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 10
Restructuring-related charges, incurred since inception 24
Total charges, incurred since inception 34
Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 79
Restructuring-related charges, incurred since inception 24
Total charges, incurred since inception 103
Severance and termination costs  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 113
Severance and termination costs | Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 30
Severance and termination costs | Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 6
Severance and termination costs | Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 77
Contract termination and other costs  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 7
Contract termination and other costs | Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 1
Contract termination and other costs | Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 4
Contract termination and other costs | Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception $ 2