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Employee Benefit Plans - Change in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at beginning of year $ 1,925 $ 2,052  
Interest cost 45 39 $ 54
Actuarial gain (453) (82)  
Benefits paid (93) (84)  
Projected benefit obligation at end of year 1,424 1,925 2,052
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,009 2,062  
Actual return on plan assets (446) 25  
Employer contributions to non-qualified plans 5 6  
Benefits paid (93) (84)  
Fair value of plan assets at end of year $ 1,475 $ 2,009 $ 2,062