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Restructuring Charges - Summary of Restructuring Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accrued Restructuring Costs          
Restructuring charges $ 33 $ 72 $ 85 $ 189  
NextGen Program          
Accrued Restructuring Costs          
Restructuring charges 33 72 85 189 $ 229
Employee separation costs          
Accrued Restructuring Costs          
Restructuring charges     55 93  
Employee separation costs | NextGen Program          
Accrued Restructuring Costs          
Restructuring charges 29 15 55 93  
Facility exit costs | NextGen Program          
Accrued Restructuring Costs          
Restructuring charges 4 55 29 92  
Accelerated depreciation 4 17 11 27  
Third party and other costs | NextGen Program          
Accrued Restructuring Costs          
Restructuring charges $ 0 $ 2 $ 1 $ 4