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Restructuring - Schedule of Restructuring and Restructuring-related Charges Incurred From Inception (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date $ 127
Restructuring-related costs 76
Total costs 203
Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 37
Restructuring-related costs 15
Total costs 52
Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 10
Restructuring-related costs 34
Total costs 44
Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 80
Restructuring-related costs 27
Total costs 107
Severance and termination costs  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 119
Severance and termination costs | Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 35
Severance and termination costs | Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 6
Severance and termination costs | Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 78
Contract termination and other costs  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 8
Contract termination and other costs | Realignment Plan  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 2
Contract termination and other costs | Network Optimization Project  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date 4
Contract termination and other costs | Project Phoenix  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, cost incurred to date $ 2