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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 2,243 $ 3,374  
Interest cost 117 103 $ 97
Actuarial (gain) loss 222 (1,032)  
Settlement (97) (146)  
Benefits paid (59) (56)  
Projected benefit obligation at end of year 2,426 2,243 3,374
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,583 3,457  
Actual return on plan assets 124 (675)  
Employer contributions 2 3  
Settlement (97) (146)  
Benefits paid (59) (56)  
Fair value of plan assets at end of year 2,553 2,583 $ 3,457
Accumulated benefit obligation at end of year 2,426 2,243  
Funded status $ 127 $ 340