Employee Benefits (Schedule Of Change In Benefit Obligation and Change In Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States [Member]
Change in plan assets
Fair value of plan assets, beginning of year	$ 486
Fair value of plan assets, end of year	526	$ 486
Foreign Plan [Member]
Change in plan assets
Fair value of plan assets, beginning of year	17
Fair value of plan assets, end of year	19	17
Pension Plan [Member] | United States [Member]
Change in benefit obligation
Benefit obligation, beginning of year	648	807
Service cost	3	3	$ 3
Interest Cost	23	24	25
Actuarial loss (gain)	80	(43)
Benefits paid	(51)	(40)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Settlements	0	(103)
Foreign exchange effects	0	0
Benefit obligation, end of year	703	648	807
Change in plan assets
Fair value of plan assets, beginning of year	486	650
Actual return	92	(22)
Employer contribution	2	3
Benefits paid	(51)	(40)
Administrative expenses paid	(3)	(2)
Settlements	0	(103)
Foreign exchange effects	0	0
Fair value of plan assets, end of year	526	486	650
Funded status, end of year	(177)	(162)
Pension Plan [Member] | Foreign Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	136	142
Service cost	2	2	2
Interest Cost	3	3	2
Actuarial loss (gain)	14	0
Benefits paid	(4)	(4)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	(4)	0
Settlements	(1)	0
Foreign exchange effects	(2)	(7)
Benefit obligation, end of year	144	136	142
Change in plan assets
Fair value of plan assets, beginning of year	17	18
Actual return	1	0
Employer contribution	0	1
Benefits paid	0	(1)
Administrative expenses paid	0	0
Settlements	0	0
Foreign exchange effects	1	(1)
Fair value of plan assets, end of year	19	17	18
Funded status, end of year	(125)	(119)
Other Postretirement Benefits Plan [Member] | United States [Member]
Change in benefit obligation
Benefit obligation, beginning of year	67	73
Service cost	1	1	1
Interest Cost	2	2	2
Actuarial loss (gain)	3	(1)
Benefits paid	(8)	(8)
Benefit obligation, end of year	65	67	73
Change in plan assets
Fair value of plan assets, beginning of year	0	0
Employer contribution	8	8
Benefits paid	(8)	(8)
Fair value of plan assets, end of year	0	0	0
Funded status, end of year	(65)	(67)
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	3	3
Service cost	0	0	0
Interest Cost	0	0	0
Actuarial loss (gain)	1	0
Benefits paid	0	0
Benefit obligation, end of year	4	3	3
Change in plan assets
Fair value of plan assets, beginning of year	0	0
Employer contribution	0	0
Benefits paid	0	0
Fair value of plan assets, end of year	0	0	$ 0
Funded status, end of year	$ (4)	$ (3)