Other Income - Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Net Periodic Pension and Post-retirement Benefit Credit	$ 64	$ 42	$ 43
Interest Income	7	17	48
Debt Repurchase Expense	0	(48)	(10)
Miscellaneous Income	8	8	7
Total Other Income - Net	$ 79	$ 19	$ 88