Employee Benefits (Schedule Of Change In Benefit Obligation and Change In Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Domestic Plan [Member]
Change in plan assets
Fair value of plan assets, beginning of year	$ 650
Fair value of plan assets, end of year	486	$ 650
Foreign Plan [Member]
Change in plan assets
Fair value of plan assets, beginning of year	18
Fair value of plan assets, end of year	17	18
Other Postretirement Benefits Plan [Member] | Domestic Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	73	80
Service cost	1	1
Interest Cost	2	2
Actuarial loss (gain)	(1)	(1)
Benefits paid	(8)	(9)
Benefit obligation, end of year	67	73
Change in plan assets
Fair value of plan assets, beginning of year	0	0
Employer contribution	8	9
Benefits paid	(8)	(9)
Fair value of plan assets, end of year	0	0
Funded status, end of year	(67)	(73)
Other Postretirement Benefits Plan [Member] | Foreign Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	3	3
Service cost	0	0
Interest Cost	0	0
Actuarial loss (gain)	0	0
Benefits paid	0	0
Benefit obligation, end of year	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
Funded status, end of year	(3)	(3)
Defined Benefit Plans [Member] | Domestic Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	807	799
Service cost	3	3
Interest Cost	24	25
Actuarial loss (gain)	(43)	41
Benefits paid	(40)	(45)
Settlements	(103)	(16)
Foreign exchange effects	0	0
Benefit obligation, end of year	648	807
Change in plan assets
Fair value of plan assets, beginning of year	650	614
Actual return	(22)	97
Employer contribution	3	2
Benefits paid	(40)	(45)
Administrative expenses paid	(2)	(2)
Settlements	(103)	(16)
Foreign exchange effects	0	0
Fair value of plan assets, end of year	486	650
Funded status, end of year	(162)	(157)
Defined Benefit Plans [Member] | Foreign Plan [Member]
Change in benefit obligation
Benefit obligation, beginning of year	142	125
Service cost	2	2
Interest Cost	3	3
Actuarial loss (gain)	0	0
Benefits paid	(4)	(3)
Settlements	0	(1)
Foreign exchange effects	(7)	16
Benefit obligation, end of year	136	142
Change in plan assets
Fair value of plan assets, beginning of year	18	16
Actual return	0	1
Employer contribution	1	1
Benefits paid	(1)	0
Administrative expenses paid	0	0
Settlements	0	(1)
Foreign exchange effects	(1)	1
Fair value of plan assets, end of year	17	18
Funded status, end of year	$ (119)	$ (124)