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Employee Benefit Plans - Change in Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 2,426 $ 2,243  
Interest cost 108 117 $ 103
Actuarial (gain) loss (141) 222  
Settlement (127) (97)  
Benefits paid (60) (59)  
Projected benefit obligation at end of year 2,206 2,426 2,243
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,553 2,583  
Actual return on plan assets (56) 124  
Employer contributions 3 2  
Settlement (127) (97)  
Benefits paid (60) (59)  
Fair value of plan assets at end of year 2,313 2,553 $ 2,583
Accumulated benefit obligation at end of year 2,206 2,426  
Funded status $ 107 $ 127