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Retirement Plans - Schedule of Net Periodic Pension Benefit/Cost (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 52 $ 52 $ 93
Interest cost 186 187 123
Expected return on plan assets (252) (248) (293)
Amortization of actuarial loss 11 9 86
Net periodic pension (benefit)/cost $ (3) $ 0 $ 9