Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Costs (Details) - Pension Benefits Cost - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Components of expense/ (income) related to net benefit expense:
Service Cost Included in Labor and Fringe	$ 5	$ 6	$ 10	$ 12
Interest Cost	28	27	55	53
Expected Return on Plan Assets	(40)	(43)	(80)	(85)
Amortization of Net Loss	5	4	11	9
Total Included in Other Income - Net	(7)	(12)	(14)	(23)
Net Periodic Benefit Credit	$ (2)	$ (6)	$ (4)	$ (11)