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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of expense/ (income) related to net benefit expense:        
Service Cost Included in Labor and Fringe $ 5 $ 6 $ 15 $ 18
Interest Cost 27 27 82 80
Expected Return on Plan Assets (40) (42) (120) (127)
Amortization of Net Loss 6 5 17 14
Total Included in Other Income - Net (7) (10) (21) (33)
Net Periodic Benefit Credit $ (2) $ (4) $ (6) $ (15)