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Retirement Plans - Schedule of Funded Status (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Projected Benefit Obligation      
Projected benefit obligation at beginning of year $ 3,880 $ 3,725  
Service cost 52 52 $ 93
Interest cost 186 187 123
Actuarial loss/(gain) (269) 146  
Gross benefits paid (336) (230)  
Projected benefit obligation at end of year 3,513 3,880 3,725
Plan Assets      
Fair value of plan assets at beginning of year 4,400 4,363  
Actual return/(loss) on plan assets (28) 235  
Non-qualified plan benefit contributions 32 32  
Gross benefits paid (336) (230)  
Fair value of plan assets at end of year 4,068 4,400 $ 4,363
Funded status at end of year $ 555 $ 520