Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - Pension Benefits Cost - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Components of expense/ (income) related to net benefit expense:
Service Cost Included in Labor and Fringe	$ 6	$ 8
Interest Cost	28	16
Expected Return on Plan Assets	(41)	(47)
Amortization of Net Loss	7	12
Total Included in Other Income - Net	(6)	(19)
Net Periodic Benefit Credit	$ 0	$ (11)