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Restructuring Charges - Restructuring Reserve (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Restructuring Reserve [Roll Forward]    
Employee separation costs accrued $ 0 $ 23
Employee Severance    
Restructuring Reserve [Roll Forward]    
Beginning balance 35 42
Employee separation costs accrued 0 8
Payments made (20) (21)
Ending balance $ 15 $ 29