(Components Of Postretirement Benefit Expense) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 1	$ 1
Interest cost	8	8	11
Actuarial loss (gain)	4	9	8
Amortization of prior service credits	(2)	(2)	(3)
Net periodic pension expense	10	16	17
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	0
Interest cost	1	2	2
Actuarial loss (gain)	2	2	3
Amortization of prior service credits	(3)	(3)	(4)
Net periodic pension expense	$ 1	$ 1	$ 1