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Employee Benefits - Changes in PBO Related to Pension Plans (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
APBO at beginning of year $ 965 $ 1,156  
Interest cost 45 27 $ 25
Actuarial losses (gains) 10 (133)  
Benefit payments (97) (85)  
APBO at end of year $ 923 $ 965 $ 1,156