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Restructuring - Schedule of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Restructuring Reserve [Roll Forward]    
Beginning balance $ 14 $ 61
Severance & severance related costs 86 31
Cash payments and other (9) (78)
Ending balance $ 91 $ 14