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Employee Benefits - Changes in FVA (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
FVA at beginning of year $ 886 $ 1,096
Actual return on plan assets 25 (138)
Employer contributions 13 13
Benefit payments (97) (85)
FVA at end of year $ 827 $ 886