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Employee Benefit Plans - Severance Accrual (Details) - Employee Severance - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restructuring Reserve [Roll Forward]      
Beginning balance $ 12 $ 31 $ 78
Accruals 328 1 1
Benefit payments (9) (20) (48)
Ending balance $ 331 $ 12 $ 31