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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Components of expense/ (income) related to net benefit expense:
Service Cost Included in Labor and Fringe	$ 6	$ 6	$ 12	$ 12
Interest Cost	27	28	53	56
Expected Return on Plan Assets	(43)	(41)	(85)	(82)
Amortization of Net Loss	4	7	9	14
Total Included in Other Income - Net	(12)	(6)	(23)	(12)
Net Periodic Benefit Credit	$ (6)	$ 0	$ (11)	$ 0