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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Costs (Details) - Pension Benefits Cost - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Components of expense/ (income) related to net benefit expense:        
Service Cost Included in Labor and Fringe $ 6 $ 6 $ 18 $ 18
Interest Cost 27 28 80 84
Expected Return on Plan Assets (42) (41) (127) (123)
Amortization of Net Loss 5 7 14 21
Total Included in Other Income - Net (10) (6) (33) (18)
Net Periodic Benefit Credit $ (4) $ 0 $ (15) $ 0