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Restructuring Charges - Restructuring Reserve (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring Reserve [Roll Forward]        
Employee separation costs accrued $ 0 $ 33 $ 0 $ 85
Employee Severance        
Restructuring Reserve [Roll Forward]        
Beginning balance     35 42
Employee separation costs accrued     0 55
Payments made     (35) (75)
Ending balance $ 0 $ 22 $ 0 $ 22