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Restructuring - Restructuring Expenses Included in Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring $ 27 $ 2 $ 60 $ 7
Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 27 0 60 0
Cost incurred to date 105   105  
Employee Severance And Other Restructuring Charges | Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 23 0 54 0
Cost incurred to date 99   99  
Real estate related costs | Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 2 0 4 0
Cost incurred to date 4   4  
Internally developed software-related charges | Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 2 $ 0 2 $ 0
Cost incurred to date $ 2   $ 2