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Restructuring - Restructuring Expenses Included in Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]        
Restructuring $ 21 $ 6 $ 81 $ 13
Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 21 0 81 0
Cost incurred to date 126   126  
Employee Severance And Other Restructuring Charges | Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 21 0 75 0
Cost incurred to date 120   120  
Real estate related costs | Strategic and Operational Efficiency Restructuring Program        
Restructuring Cost and Reserve [Line Items]        
Restructuring 0 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 0 $ 0 2 $ 0
Cost incurred to date $ 2   $ 2