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Restructuring - Schedule of Restructuring and Restructuring-related Charges Incurred From Inception (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception $ 122
Restructuring-related charges, incurred since inception 65
Total charges, incurred since inception 187
Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 32
Restructuring-related charges, incurred since inception 10
Total charges, incurred since inception 42
Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 10
Restructuring-related charges, incurred since inception 29
Total charges, incurred since inception 39
Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 80
Restructuring-related charges, incurred since inception 26
Total charges, incurred since inception 106
Severance and termination costs  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 115
Severance and termination costs | Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, incurred since inception 31
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 78
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