Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Costs (Details) - Pension Benefits Cost - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Components of expense/ (income) related to net benefit expense:
Service Cost Included in Labor and Fringe	$ 5	$ 6
Interest Cost	27	26
Expected Return on Plan Assets	(40)	(42)
Amortization of Net Loss	6	5
Total Included in Other Income - Net	(7)	(11)
Net Periodic Benefit Credit	$ (2)	$ (5)