Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 22	$ 0	$ 206
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance Costs	14	0	132
Facility Closing
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	8	0	10
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	0	0	15
Property, Plant and Equipment, Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	0	0	40
Asset Retirement Obligation Costs
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	$ 0	$ 0	$ 9