(Postretirement Benefit Adjustments Recognized In Other Comprehensive (Loss) Income) (Details) - Other Postretirement Benefits Plan [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	$ 5
Amortization of actuarial (loss) gain	(5)
Current year prior service cost	0
Amortization of prior service credit	1
Divestitures	0
Currency impact	0
Total recognized in other comprehensive income	1
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Current year actuarial (gain) loss	1
Amortization of actuarial (loss) gain	(1)
Current year prior service cost	0
Amortization of prior service credit	2
Divestitures	(2)
Currency impact	(1)
Total recognized in other comprehensive income	$ (1)