Employee Benefit Plans - Net Benefit Expense Recorded on the Income Statement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of expense/ (income) related to net benefit expense [Abstract]
Total Income Included in Other Income - Net	$ (79)	$ (64)	$ (42)
Pension Benefits
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost Included in Labor and Fringe	32	41	43
Interest Cost	64	55	82
Expected Return on Plan Assets	(188)	(186)	(176)
Amortization of Net Loss	50	73	54
Total Income Included in Other Income - Net	(74)	(58)	(40)
Net Periodic Benefit (Credit)/Cost	(42)	(17)	3
Settlement Loss (Gain)	1	0	(1)
Total Periodic Benefit (Credit)/Cost	$ (41)	$ (17)	$ 2